Leave the installation of solar panels in Aikou District, Kanagawa Prefecture (Aikawa Town and Kiyokawa Village) to Kakeru Koumuten Co., Ltd.!
For
Solar Panel and Battery Installation in Aikou District (Aikawa Town and Kiyokawa Village) trust
Kakeru Koumuten!
Kakeru Koumuten is a company specializing in exterior renovations based in Kanagawa Prefecture.
As a company strong in roofing work, we are entrusted with solar panel installation and battery installation considering roofing and waterproofing!
“How to Choose a Solar Panel Contractor in Aikou District (Aikawa Town and Kiyokawa Village)”
“Costs for Solar Panel and Battery Installation”
“Subsidies Available for Solar System Installation in Aikou District (Aikawa Town and Kiyokawa Village)”
We will also explain the above three points!
Installing solar panels carries risks such as “the occurrence of leaks” and other troubles.
To ensure you do not regret your solar panel installation, we recommend obtaining estimates from about three companies!
Table of Contents (tap to open/close)
- Reasons why Kakeru Koumuten is chosen for solar panel installation in Aikou District (Aikawa Town and Kiyokawa Village)
- Roof inspection before solar panel installation
- Subsidies and grants that may be applicable in Aikou District (Aikawa Town and Kiyokawa Village)
- Price list for solar panel and storage battery installation
- Breakdown of installation capacity, equipment, and construction costs
- Self-estimation and financial simulator for solar power generation
- Customer testimonials
- Case studies of solar panel installations
- How to choose a solar panel installation contractor in Aikou District (Aikawa Town and Kiyokawa Village)
- Benefits of introducing solar equipment
- Points to be aware of when introducing solar power generation
- How to choose solar panels
- Frequently asked questions about solar and storage battery installation in Aikou District (Aikawa Town and Kiyokawa Village)
- If you are looking for a solar panel installation contractor in Aikou District (Aikawa Town and Kiyokawa Village), contact Kakeru Koumuten
- Characteristics of Aikou District (Aikawa Town and Kiyokawa Village) and points for solar installation
- Service area in Aikou District (Aikawa Town and Kiyokawa Village)
Reasons why Kakeru Koumuten is chosen for solar panel installation in Aikou District (Aikawa Town and Kiyokawa Village)
The reasons why our company is entrusted with solar panel installation by customers in Aikou District (Aikawa Town and Kiyokawa Village)
“Our strengths in solar panel installation that cannot be imitated by other companies”
have received high praise from many customers.
so we would appreciate it if you could compare our estimates with those of other companies.
Because we are confident, we welcome estimates from any number of companies!
1. We can also handle exterior renovations other than solar panel installation!
Troubles such as leaks that occur during solar panel installation may be caused by insufficient checks on the roof and waterproofing at the installation site.
Even if you are knowledgeable about solar panels, there are cases where the roof and waterproofing at the installation site are outside your expertise, so caution is necessary.
It is reassuring to have expertise in roofing to avoid maintenance and troubles after installation!
Kakeru Koumuten Co., Ltd. is strong in roofing work and can also detach and attach solar panels in-house, allowing for quick responses to maintenance and urgent troubles after solar panel installation!
2.Facilities Specialized in Exterior Renovation
Kakeru Koumuten Co., Ltd. has organized the following warehouses and material storage areas to provide solar work and exterior renovations at low cost and high quality.
We have established five bases centered around Yokohama City, Kanagawa Prefecture for material storage and showrooms.
In-house Scaffolding Materials
To ensure safety during work on the roof, we have our own scaffolding materials necessary for temporary scaffolding according to construction conditions, and we can assemble scaffolding ourselves.
By not outsourcing scaffolding work and using our own scaffolding team, we can also cut costs for scaffolding work.
We have scaffolding materials for approximately 50 single-family homes!
Even if there are height differences on the site, our own scaffolding team will plan the scaffolding according to the local conditions.
Storage of Materials in Our Large In-house Warehouse
We store roofing materials and paints, and we can also store removed solar panels.
By ordering a large quantity of materials at once, you canpurchase materials at a lower cost!
Additionally, we always have roofing materials in stock, so we canrespond quickly in emergencies!
Sorting and Transporting Waste Materials In-House
The installation of solar panels often involves roofing work, generating various waste materials such as paint, wood, and metal.
By sorting and recycling waste materials, we can significantly cut waste disposal costs.
Exterior Renovation Dedicated Showroom
In the showroom, not only can you have meetings, but you can also
check the actual foundation brackets for solar panels and see how they are attached to the roofing materials!
You can also simulate the potential earnings and installation costs when introducing solar panels!
Since roofing and exterior wall work are often involved, we also provide samples of roofing materials and models that explain the structure, allowing for detailed explanations!
3.All Work Performed by Our Own Team
One of Kakeru Koumuten’s major strengths is its complete in-house construction.
By having Kakeru Koumuten handle everything from inquiries to project completion in a consistent manner, we can keep costs down while providing high-quality roof renovations.
Additionally, one representative will assist you from the estimate to the completion of the work.
Since the person in charge does not change, whether it be the sales representative or the construction management representative, smooth communication is possible.
We can perform consistent in-house construction from temporary scaffolding installation, exterior wall painting, to roof renovations!
4. Various Permits and Skilled Workers
We have obtained permits for the construction industry and for the collection and transportation of industrial waste!
We also have nationally certified sheet metal workers and painting specialists, and we are confident in our construction techniques.
We can also handle large-scale roofing projects such as factories!
5. Warranty and Aftercare
In addition to the manufacturer’s warranty for solar panel installation work, our own construction warranty (leakage warranty) is also included!
(The construction warranty for solar panel installation is 10 years. Depending on the condition of the roof before installation, we may not be able to provide a warranty unless a roof renovation is performed. The construction warranty is separate from the manufacturer’s product warranty, and the scope and conditions vary depending on the warranty details.)
Aftercare is available annually, and we send out notification DM every year.
If you have questions about the warranty, please click on the image above!
6. Flexible and Prompt Response
Our company is equipped to handle various roofing troubles and situations.
If you are unable to access the roof due to height, we can utilize drones to assist!
During leak investigations, we can also conduct inspections using a thermal imaging camera.
If the power generation of your solar panels decreases due to dirt or other factors, we can provide cleaning with a specialized brush.
We will respond according to your wishes.
7. Human Resource Development
To improve skills, we create various roofing models and conduct practical training.
Since the construction methods vary depending on the shape and slope of the roof, we regularly provide technical training to ensure that each staff member can handle various cases.
8. Creation of Easy-to-Understand Materials and Simulations
Kakeru Koumuten provides not only “estimates,” “layout diagrams,” and “power generation simulations” but also a “solar construction guidebook” and a “profit and loss simulation” that takes into account loan interest rates and electricity costs.
The profit and loss simulation can be created for projected cumulative profits and losses over 20 to 30 years.
We compile easy-to-understand materials, including points to consider and disadvantages, even for customers who are not familiar with solar construction!
We encourage you to obtain comparative estimates and compare them with other companies’ plans!
Roof Inspection Before Installing Solar Panels
Once solar panels are installed, they will remain on the roof for 20 to 30 years.
Confirming “Is it okay to install them directly on the current roof?” before installation is the key point to prevent leaks and unnecessary expenses!
Kakeru Koumuten, which specializes in roofing work, has summarized the items to check before installation.
| 1. Types of Roofing Materials and Age | The fixing method varies depending on the roofing materials such as slate, tiles, metal roofs, and flat roofs (roof waterproofing). If the remaining lifespan of the roofing material is short, we may suggest roof renovation first. |
| 2. Condition of Substrate and Waterproof Sheet | If the sheathing or roofing (waterproof sheet) beneath the roofing material is damaged, it can affect the fastening strength and waterproofing. We will also check for any signs of water leakage. |
| 3. Orientation, Slope, and Shadows of the Roof | The orientation and slope of the roof surface, as well as shadows from neighboring houses, trees, and utility poles, can affect power generation. We will create a layout diagram from the drawings and the site, and you can check it with a power generation simulation. |
| 4. Shape of the Roof and Usable Area | The number of panels that can be installed (installation capacity) is determined by the shape and size of the roof. The number of panels that can be installed varies depending on the size of the panels, so we will compare based on the total output of the roof. |
| 5. Fixing Method and Waterproofing Details | We will confirm whether the method involves drilling holes in the roofing material or using brackets to secure the roofing material. The fixing method varies by technique, so please check the waterproofing treatment method for the fixing parts during the estimate. |
| 6. Weight of the Roof | The roof will become heavier due to the panels. After investigating the existing roof, substrate, and load-bearing capacity, switching to lighter roofing materials may be an option if necessary. |
| 7. Location of Equipment Installation and Wiring | We will check the installation location of the power conditioner and storage battery, as well as the wiring route to the distribution board. The length of the wiring also affects costs. |
| 8. Ease of Scaffolding Setup and Delivery Routes | If there are elevation differences on the site, planning for scaffolding and the delivery routes for equipment and materials may require some ingenuity. The width of the front road and any steps on the site will also be confirmed during the on-site investigation. |
Fixing Methods and Checkpoints by Roofing Material
| Roof Material | Main Fixing Method | Pre-Installation Check Points |
|---|---|---|
| Slate Roof | Varies by method (e.g., fixing brackets with screws to the roofing material and substrate) | Waterproofing treatment of fixed parts, cracks or deterioration of slate, condition of the substrate. If deterioration is advanced, consider roof overlay (cover method) or replacement first. |
| Tile Roof | Fixed with brackets and methods suited to the type of tile (even methods that do not drill holes in the tiles will fix to the substrate) | Type and condition of tiles, substrate, load-bearing capacity. Depending on the survey results, there may be methods to replace with lightweight roofing materials before installation. |
| Metal Roof (Horizontal and Vertical) | Fixed with catch-type brackets that grip the roofing material (depends on the combination of roofing material and brackets) | Whether the roofing material and brackets are compatible, installation conditions from the roofing material manufacturer. If compatible, methods that do not drill holes may be available. |
| Flat Roof / Rooftop | Fixed by installing a frame | Type and deterioration status of the waterproof layer, waterproofing around the frame. Consider in conjunction with the timing of waterproofing work. |
If you renovate the roof 10 to 20 years after installation, there will be additional costs for the removal and reinstallation of solar panels. If the roof is deteriorating, renovating to a highly durable roofing material before installation may help reduce costs in the long run.
Kakeru Koumuten Co., Ltd. specializes in roofing work and can also handle the removal and reinstallation of solar panels in-house, so please consult us according to the condition of your roof!
Potential Subsidies and Grants in Aikō District (Aikawa Town and Kiyokawa Village), Kanagawa Prefecture
If you are introducing solar panels or storage batteries in Aikō District (Aikawa Town and Kiyokawa Village), you may be eligible for programs from the “National Government,” “Kanagawa Prefecture,” and your local “Aikawa Town” or “Kiyokawa Village.”
The following information is based on the official pages of each program as of October 6, 2026. The application status may change depending on the budget, so please check the latest information before contracting or starting work.
Eligibility Conditions and Application Timing for Subsidy Programs
| Program | Main Eligibility Conditions | Subsidy Amount | Application Period & Status |
|---|---|---|---|
| Aikawa Town “Smart Energy Equipment Installation Subsidy” | Individuals registered as residents in the town with no tax arrears. Installation must be for a residence where the individual resides. Installation of eligible equipment must be conducted between January 1 of the previous year and February 15 of the current year. The guidelines specify that a notification of planned application must be submitted before installation, followed by a subsidy application after installation. | Solar: 10,000 JPY per kW (maximum 30,000 JPY). An additional 20,000 JPY for total output of 5.0 kW or more (excluding expansions) Storage battery: 1/2 of the installation cost (maximum 50,000 JPY) |
First come, first served, ending once the planned number is reached. As of June 3, 2026, the official town page lists available applications as 25 for solar and 21 for storage batteries. |
| Kiyokawa Village “Residential Smart Energy Equipment Installation Subsidy” | Must reside in the village and have fully paid village taxes (tenants require landlord’s consent. Installations for commercial purposes are not eligible). Only unused products are eligible, and storage batteries must be registered products of the General Incorporated Association Environmental Collaboration Initiative (SII). Applications must be made within the fiscal year in which the installation/purchase date falls. | Solar: 15,000 JPY per kW (maximum 50,000 JPY) Storage battery: Fixed amount of 50,000 JPY If combining multiple devices, the total maximum is 100,000 JPY. |
The guidelines (effective April 1, 2025) state that subsidies will be granted within the budget limits. Please confirm the application status with the village before contracting. |
| Kanagawa Prefecture “Fiscal Year 2026 Kanagawa Prefecture Residential Solar Power and Storage Battery Installation Subsidy” | Must install both solar power and storage systems in a residential building (with earthquake resistance). Applications must be made by the individual, and construction can begin after subsidy approval. | Solar: 70,000 JPY per kW Storage battery: 150,000 JPY per unit |
Phase 1: May 11, 2026 – June 30, 2026 Phase 2: Starts September 7, 2026 (first come, first served) As of September 7, 2026, the application amount reached the budget limit, and applications are now closed. Please check the prefecture’s official page for future recruitment. |
| National “DR Home Storage Battery Project” (Supplementary Budget for Fiscal Year 2025) | New installation of home storage systems that can be utilized for DR (demand response) with registered products. | Calculated based on an initial effective capacity of 3.45 million JPY per kWh (subsidy rate within 30% and maximum 600,000 JPY per application). | As of May 29, 2026, the budget has been reached, and public recruitment has ended. (The official site states there are no plans to reopen recruitment, and applications are currently not possible.) |
| National “Mirai Eco Housing 2026 Project” (Renovation) | Storage batteries are one of the eligible facilities, but they must be combined with essential works such as insulation renovation of windows (openings) and structures; applications cannot be made for just the installation of storage batteries. Solar panels are not included as eligible facilities. | Storage battery: 96,000 JPY per unit | Ends as soon as the budget limit is reached. As of October 5, 2026, the application amount for renovations is displayed as 8% of the budget on the official website. Please check the application status on the official website. |
| Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Self-Consumption Type Renewable Energy Introduction Subsidy” | Corporations and individual business owners filing blue returns (individual residences are not eligible). For solar power, a generation output of 10kW or more, facilities for business use, equipment not certified under FIT/FIP, etc. | Solar Power: 80,000 JPY/kW, etc. Storage Systems: 50,000 JPY/kWh (maximum 5,000,000 JPY) |
Application period ended on September 3, 2026 (application amount reached the budget amount) |
The subsidy for Aikawa Town requires submitting a notification of planned application before installation and a grant application after installation, in a two-step process, and will end once the planned number is reached on a first-come, first-served basis. The subsidy for Kiyokawa Village is provided within the budget range, and applications must be made within the fiscal year in which the installation/purchase date falls. For Kanagawa Prefecture’s residential subsidies, construction must start after receiving the “grant decision”; starting construction beforehand will make it ineligible. Eligibility conditions, application procedures, and the possibility of combining different systems vary, and applying does not guarantee a grant, so please confirm before contracting or starting construction.
At Kakeru Koumuten, we will guide you on the eligibility conditions and application periods for each system after confirming them.
National Subsidy “DR Home Storage Battery Project (Support Project for the Introduction of Home Storage Systems for DR Resources)”
The national government has been implementing the “DR Home Storage Battery Project” to support the installation of home storage batteries.
This program targets those who are introducing new registered products of storage systems that can be utilized for demand response (DR), and in the supplementary project for Reiwa 7, the subsidy amount was determined based on a standard amount of 34,500 JPY per initial effective capacity of 1kWh, with a subsidy rate of up to 30% and a maximum of 600,000 JPY per application. There are also conditions such as that contracts or orders made before the grant decision are not eligible.
However, the supplementary project for Reiwa 7 reached the budget with the application amount on May 29, 2026, and the public recruitment has ended. The official website also states that there are no plans to reopen public recruitment, and applications are currently not possible. Please check the official website for future public recruitment.
Additionally, there are currently no subsidies confirmed for the installation of solar panels for existing homes.
👉 Click here for the official website of the DR Home Storage Battery Project
Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Residential Solar Power Generation & Storage Battery Introduction Subsidy”
Kanagawa Prefecture provides subsidies for those who introduce both “solar panels” and “storage batteries” for residential use.
The subsidy details are 70,000 JPY per kW for solar power generation and 150,000 JPY per unit for storage systems.
For example, if you introduce a 4kW solar panel and one storage battery, the subsidy amount calculation would be 4kW × 70,000 JPY + 150,000 JPY = 430,000 JPY.
The target is residential buildings that ensure seismic performance, and the energy storage system must be a registered product. If construction begins before the grant decision, it will be excluded from eligibility, and the application must be made by the individual (proxy applications by contractors are not allowed). Whether town and village subsidies can be combined with prefectural subsidies may vary by system, so please confirm with each office before signing a contract.
For the fiscal year Reiwa 8, the first period (May 11 – June 30) and the second period (starting September 7, first-come-first-served) were accepted. The second period has closed on September 7, 2026, as the application amount reached the budget amount. For subsequent recruitment, please check the official page of Kanagawa Prefecture.
👉 Click here for the official page of Kanagawa Prefecture
Kanagawa Prefecture “Reiwa 8 Fiscal Year Kanagawa Prefecture Subsidy for Introducing Self-Consumption Renewable Energy (for Businesses)”
Kanagawa Prefecture is also implementing subsidies for businesses that introduce “self-consumption” facilities that use electricity generated by solar panels.
Eligible applicants are corporations or individual business owners filing blue returns, and the introduction to individual residences is not eligible.
Conditions include solar power generation with an output of 10kW or more, supplying electricity to business facilities within the prefecture, and being a facility not certified under FIT or FIP.
The subsidy amount is 80,000 yen per kW for solar power generation and 50,000 yen per kWh for the energy storage system installed together (up to 5 million yen).
For the fiscal year Reiwa 8, applications have closed on September 3, 2026, as the application amount reached the budget amount.
Businesses considering the installation of solar panels on commercial buildings in Aikou District should check the official page of Kanagawa Prefecture for the next recruitment.
👉 Click here for details
Aikawa Town “Smart Energy Equipment Installation Subsidy (Reiwa 8 Fiscal Year)”
This subsidy is for solar power generation systems and residential energy storage batteries installed in homes within the town. HEMS, home fuel cell systems, and solar thermal utilization systems are also included in the subsidy targets.
● Solar power generation system: 10,000 yen per kW (up to 30,000 yen). An additional 20,000 yen for a total output of 5.0 kW or more (excluding expansions)
● Residential energy storage battery system: 1/2 of the installation cost (up to 50,000 yen)
Eligible applicants are individuals registered as residents in the town, and there must be no delinquency in town taxes. The installation of eligible equipment must have been carried out between January 1 of the previous year and February 15 of the current year. According to the town’s guidelines, a notification of planned application must be submitted before installation, followed by a grant application after installation.
First come, first served, and it will end as soon as the planned number of cases is reached. According to the town’s official page (updated June 3, 2026), the current number of applications available as of that date is 25 for solar power and 21 for storage batteries. Please confirm the eligibility for combining with Kanagawa Prefecture’s subsidies at the town and prefectural offices before signing a contract.
👉 Click here for the official page of Aikawa Town
Kiyokawa Village “Subsidy for Introduction of Residential Smart Energy Equipment”
This subsidy is for solar power generation systems and storage batteries installed in residential homes within the village.
● Solar power generation system: 15,000 yen per kW (maximum 50,000 yen)
● Storage battery: Fixed amount of 50,000 yen
● If combining multiple systems, the total maximum is 100,000 yen
Eligible applicants are those who reside in the village and have fully paid their village taxes; if you are a tenant, the landlord’s consent is required. Builders or businesses installing for sales purposes, as well as those who have previously received subsidies for the same equipment, are not eligible. Equipment must be unused, and storage batteries must be registered products of the General Incorporated Association Environmental Collaboration Initiative (SII). You must apply within the fiscal year in which the installation or purchase date falls.
The village’s guidelines (effective April 1, 2025) state that grants will be provided within the budget limits. Please confirm the eligibility for combining with Kanagawa Prefecture’s subsidies and the latest application status at the village and prefectural offices before signing a contract.
👉 Click here for Kiyokawa Village’s guidelines
Solar Panel Installation & Storage Battery Installation Price List
⇧Service Menu | Click here for costs regarding solar panel removal & water heater removal
Breakdown of Installation Capacity, Equipment, and Construction Costs
The costs for solar panels and storage batteries should be confirmed by separating them into “Equipment Costs (Device Costs)” and “Construction Costs”.
Even for the same “Complete Solar Panel Installation,” the amount can vary significantly depending on the installation capacity, equipment grade, and roof condition.
Understanding Installation Capacity (kW) and Storage Battery Capacity (kWh)
The installation capacity of solar panels is determined by “Output of One Panel (W) × Number of Panels”, with the unit being kW (kilowatt). Storage batteries are compared based on the amount of electricity they can store, expressed in kWh (kilowatt-hour).
The amount of kW that can be installed on a roof varies for each house depending on the shape, orientation, and size of the roof. At Kakeru Koumuten, we create layout diagrams from blueprints and on-site surveys to present the installation capacity.
On our pricing page, we list solar panels at approximately 800,000 JPY to 1,200,000 JPY for 3-5 kW, and 1,200,000 JPY to 1,900,000 JPY for 6-10 kW. (These are just estimated amounts and can vary based on wiring length, scaffolding range, existing roofing materials, panel layout, etc.)
▶ Construction Menu | Costs for Solar Panel Installation and Storage Battery Installation
Items to Confirm in the Estimate (Cost Verification)
When comparing estimates, it is common to compare different capacities and equipment by only looking at the amounts. Please check if the following items are clearly stated in each company’s estimate!
| 1. Solar Panels | Manufacturer, model number, output per panel (W), number of panels, total installation capacity (kW) are listed. |
| 2. Power Conditioner | Manufacturer, model number, capacity, number of units, installation location (indoor/outdoor). Also check if it is a type that controls in conjunction with a storage battery. |
| 3. Storage Battery | Manufacturer, model number, capacity (kWh), range usable during a power outage (entire house or specific circuits), installation location. |
| 4. Mounting Frame and Hardware | Name of the hardware suitable for the roofing material and the method of securing it (whether it involves drilling holes or clamping for fixation). |
| 5. Wiring and Electrical Work | Wiring route and length, work around the distribution board, presence of a monitor to check power generation. |
| 6. Roof Reinforcement and Waterproofing | Details of waterproofing treatment at fixed points, whether necessary roof repairs and substrate reinforcements are included. |
| 7. Application | Extent of support for applications to the power company, certification application for selling electricity (FIT), and subsidy applications. |
| 8. Scaffolding | Scope and quantity of scaffolding. If roofing work and exterior painting are done simultaneously, check that the same scope and quantity are not counted twice. |
| 9. Removal and Disposal | Whether the removal of existing solar thermal water heaters and old panels, as well as disposal costs for waste materials, are included. |
| 10. Tax Classification and Warranty | Whether prices are tax-inclusive or tax-exclusive, conditions under which additional costs may arise, details and duration of manufacturer and workmanship warranties. |
If the capacity differs, both the price and power generation will change. Kakeru Koumuten Co., Ltd. warmly welcomes competitive estimates, so if you bring estimates from other companies, we will explain the differences for each item!
Self-Estimate and Profit Simulation for Solar Power Generation
With the simulator above,
you can obtain a rough estimate and a profit simulation for up to 30 years!
If you know the total installation capacity of solar panels on the roof and the capacity of the storage battery, you can obtain a rough estimate and profit simulation!
*The simulation results are approximate. Actual profits may vary based on assumptions such as electricity rates, self-consumption ratios, selling prices, and costs for equipment inspection or replacement.
Customer Feedback
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customer reviews
Asao-ku, Kawasaki City | We received reviews about the ridge cap and rain gutter replacement work!
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customer reviews
Kohoku-ku, Yokohama | We received reviews about the roof overlay (cover method)!
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customer reviews
Kohoku-ku, Yokohama | We Received Reviews About Exterior Painting!
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customer reviews
Hodogaya-ku, Yokohama | We received reviews about our exterior fence construction!
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customer reviews
Tsurumi-ku, Yokohama | We received reviews about roof and exterior wall painting, as well as metalwork and rain gutter replacement work!
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customer reviews
Higashiyamato City, Tokyo | We received reviews about exterior painting and roof overlay (cover method)!
Case Studies of Solar Panel Installations
| Construction Details |
| Solar Panel Installation Battery Installation |
| Existing Roofing Material |
| Horizontal Metal Roof (Super Galtect) |
| Installation Capacity |
| Solar Panel: 4.3kW Battery: 5kWh range |
| Base Mounting Hardware Used |
| Niigata Manufactured / Aluminum Catch Type Hardware |
| Fixing Method & Waterproofing Details |
| Fixed with catch type hardware gripping the horizontal metal roof (Catch Method) |
| Price Range |
| 2,200,000 JPY～2,300,000 JPY *Due to the grant being provided, the actual burden amount is approximately 1,000,000 JPY Estimated recovery period for construction costs: about 8 to 9 years (self-consumption) *The grant amount and recovery estimate are based on the system and calculations at the time of construction, and may differ under the current system. |
| Construction Period |
| About 3 days |
| Completion Month |
| April 2025 |
| Inquiry Details |
| I am considering the installation of solar panels and storage batteries. I heard that grants are available, and I would like to know how much will be provided. |
Our Proposal
We visited to provide an estimate and created a layout diagram for the solar panels from the drawings!
The layout diagram shows the arrangement of solar panels when placed on the roof.
Since we can also determine the installation capacity, it allows for power generation simulations and financial simulations.
We have also understood the expected amount of the grant, so we explained it to the customer along with the estimate!
How to Choose a Solar Panel Installation Contractor in Aikou District (Aikawa Town and Kiyokawa Village)
There are many solar panel installation contractors available in Aikou District (Aikawa Town and Kiyokawa Village), and you may be unsure which contractor to choose.
Therefore, when requesting solar panel installation and battery storage installation work, let’s confirm the following 4 points.
● Ensure they have extensive knowledge not only about solar panels but also about roofs
● Check for warranties and after-sales maintenance
● Obtain estimates from multiple contractors (3 companies is a guideline)
● Confirm if they provide support for subsidy applications
By confirming the above 4 points, you will be able to choose a reliable contractor.
Knowledge about roofs as well as solar panels
Improper installation of solar panels can be caused by a lack of knowledge and verification regarding roofs and waterproofing.
While knowledge about solar panels is certainly important, understanding the roof and waterproofing at the installation site of the solar panels is also crucial.
⚠︎Examples of troubles caused by insufficient verification of roofs and waterproofing
・Solar panels installed on a severely deteriorated roof causing leaks
・Solar panels installed on a roof with a short lifespan, requiring remodeling for removal and reinstallation within a few years
・Misjudging the type of waterproofing and applying incorrect treatment, leading to leaks
and more
When installing solar panels, understanding the condition and type of the existing roof allows you to avoid unnecessary expenses and unforeseen troubles.
▶ Go to “Roof Verification Before Installing Solar Panels” in this article
Check for warranties and after-sales maintenance
When choosing a solar installation contractor, let’s confirm the availability of warranties. It is important to check not only the duration of the warranty but also the coverage, exclusions, and cost conditions.
While the solar panels and battery storage units come with manufacturer warranties, also check for the availability of installation warranties in case leaks occur after installation!
For contractors that offer installation warranties, if leaks occur after installation, they may cover the repairs under the warranty, provided it falls within the warranty period and conditions.
Additionally, some contractors offer after-sales services separate from warranties, so be sure to check if the contractor you are considering has after-sales service.
Since abnormalities or damages on the roof may not be visible, you might not notice them yourself.
By conducting inspections during after-sales maintenance, you can detect abnormalities early, making it easier to prevent major repairs or failures!
Kakeru Koumuten Co., Ltd. offers a rain leak warranty as part of the workmanship warranty for solar panel installations. (The warranty for solar panel installations is 10 years, and depending on the condition of the roof before installation, we may not be able to provide a warranty without performing roof renovations.)
We also provide aftercare maintenance, and we send out annual direct mail!
Please check the DM, and if you wish, we will visit you for aftercare maintenance!
Obtain estimates from multiple contractors (3 companies as a guideline)
When requesting solar panel installation, let’s obtain estimates from multiple contractors.
Even for the same manufacturer and the same construction content, costs may vary, and warranties and after-sales services may differ.
Additionally, obtaining multiple estimates makes it easier to negotiate prices.
To request from your preferred contractor at a lower price, we recommend obtaining estimates from multiple contractors.
When comparing estimates, please check:
“Verification of estimate items”
“Types of solar panels”
“Warranties and after-sales services”
and make a detailed comparison! Avoid judging solely based on cost, as using lower-grade materials or skipping processes can reduce costs!
▶ To “Breakdown of installation capacity, equipment, and construction costs” in this article
Check if they provide support for subsidy applications
There may be subsidies available for solar panel installations and battery installations, but if the order of procedures is incorrect or if there are deficiencies in the documents, the subsidy may not be granted.
For systems like Kanagawa Prefecture’s housing subsidies, where applications cannot be submitted by the contractor and must be done by the individual, it is reassuring to have a contractor who can support the preparation of necessary documents and the flow of procedures.
Complete the procedures specified for each system (for the prefectural housing subsidy, this means obtaining a grant decision) before proceeding with the construction!
For the prefectural housing subsidy, after the construction is completed, a performance report must be submitted, and the flow will go through a review before the grant is issued! (The flow of procedures varies by system)
Benefits of Introducing Solar Equipment
The benefits of introducing solar panels are as follows!
Benefit 1: Economic Benefits
The biggest advantage of introducing solar panels is the economic benefit!
The selling price of electricity has decreased compared to 10 years ago, but by consuming the electricity generated, you can reduce the amount of electricity purchased from the utility company and gain benefits!
As electricity prices rise, the ability to cover your power consumption with solar power becomes attractive!
If you plan to use the generated electricity at night, installing a storage battery is essential!
Furthermore, the selling price (FIT) for residential use (under 10kW) will be set at “24 yen/kWh for the first 4 years, and 8.3 yen/kWh from the 5th to the 10th year” for certifications after October 2025, and the same price will apply for the 2026 fiscal year. After the 5th year, it is likely to be more advantageous to use it in your home (self-consumption) rather than selling it, making the combination with a storage battery a viable option.
👉 Ministry of Economy, Trade and Industry | For purchase prices and periods, click here
Advantage 2 Subsidies can be utilized!
The conditions and amounts of subsidies vary by prefecture and municipality, but if you meet the conditions, you may be able to utilize subsidies!
Reducing the actual burden through subsidies is a significant advantage!
In the case of Aikou District, it may be possible to qualify for the programs from the national government, Kanagawa Prefecture, and your local Aikawa Town or Kiyokawa Village (please check the application status for each program).
Advantage 3 Environmentally friendly!
Solar power generation has low carbon dioxide emissions and can reduce dependence on fossil fuels, contributing to the mitigation of global warming.
Solar panels themselves do not produce noise or exhaust gases during the generation process, making them an environmentally friendly method of power generation. (However, devices like power conditioners may have operational noise.)
Advantage 4 Heat insulation effects can be expected!!
By installing panels on the roof or rooftop, they block direct sunlight to the roof.
Especially in summer, this can help reduce the temperature rise of the roof, providing a heat insulation effect!
(Note that this does not improve the building’s insulation performance itself.)
Benefit 5: Electricity can be used even during power outages!!
If a storage battery is installed, it becomes possible to use electricity even during emergencies such as power outages!
Even without a storage battery, if you have a power conditioner with autonomous operation functionality, you may be able to use electricity from a dedicated outlet during daytime generation.
(The devices, output, and duration that can be used during a power outage vary depending on the model and wiring method.)
What points should be noted when introducing solar power generation?
Next, we will explain the “three points to note” when installing solar panels!
Point 1: Maintenance costs can be incurred
A maintenance cost that is particularly easy to overlook is the roof where solar panels are installed.
If you perform a roof renovation 10 to 20 years later, there will be costs for removing and reattaching the solar panels.
If the existing roof is deteriorating, it is reassuring to renovate it with durable roofing materials before installing the solar panels!
Additionally, there will be costs for regular inspections of the equipment, repairs or replacements of the power conditioner, and updates due to the deterioration of the storage battery.
It is reassuring to ask for a simulation that considers maintenance costs before introducing solar panels!
Point 2: The risk of leaks increases depending on the roofing material
The fixing methods for slate roofs and tile roofs vary by construction method, but in methods that fix hardware to the roofing material and substrate with screws, waterproofing of the fixed parts is crucial.
In methods that create holes in the roof, the risk of leaks inevitably arises.
Of course, we will ensure proper waterproofing, but if you are concerned about making holes, one option is to replace the roofing material with a metal roof and fix the solar panels using the catch method. (The catch method has compatibility conditions between the roofing material and hardware, and it cannot be used with all metal roofs.)
Catch-type base hardware exclusively for horizontal metal roofs
Point 3 The Roof Becomes Heavier
Installing solar panels will make the roof heavier. After investigating the existing roof, substrate, and load-bearing capacity, replacing with a lightweight roof may also be one option if necessary.
How to Choose Solar Panels?
There are many manufacturers of solar panels, and their output and costs vary.
It is not simply a matter of “this manufacturer has the best solar panels”; it is important to choose solar panels that are suitable for your life plan and building!
Here are some points to consider when comparing solar panels!
How to Choose 1: Compare Based on Total Output of the Roof
When installing solar panels on the roof, it is important to consider how much electricity can be generated in a limited area, and the more electricity generated, the better!
Solar panels come in various sizes and outputs depending on the manufacturer.
A panel with 350W output and a panel with 400W output may seem that the one with higher output is better at first glance.
However, if the size of the panel does not fit well on the roof, there may be cases where “20 panels of 350W can be installed” and “15 panels of 400W can be installed,” leading to different installation capacities even on the same roof due to the size difference of the panels.
400W×15 panels = 6kW (total output of the roof)
350W×20 panels = 7kW (total output of the roof)
As shown above, even if the output of a single panel is lower, the total output of the roof may be higher!
It is important to consider the total output of the roof rather than the output of a single panel!
*The above is a calculation of total output (kW). The actual electricity generation amount (kWh) will vary depending on conditions such as the roof’s orientation, slope, and shading.
How to Choose 2: Compare Based on Degradation Rate of Solar Panels
Solar panels have a degradation rate, and their output gradually decreases over 10 years and 20 years.
The degree of output decline after long-term use varies by product. The manufacturer’s output guarantee value is a standard figure for warranty purposes and does not indicate the actual degradation rate or electricity generation amount.
By considering the degradation rate as well as the initial output, you can choose solar panels without regrets!
How to Choose 3: Compare Based on Warranty Period
There are several types of warranties for solar panels, including “output warranty,” “natural disaster warranty,” and “system warranty,” and the warranty periods vary by manufacturer.
Regarding output warranties, some manufacturers offer a 30-year warranty while others provide a 10-year warranty, so it varies!
The longer the warranty, the better, so be sure to check the warranty period and conditions of the manufacturers you are considering!
Frequently Asked Questions about Solar and Storage Battery Installation in Aikou District (Aikawa Town and Kiyokawa Village)
We have compiled frequently asked questions from customers considering the installation of solar panels and storage batteries in Aikou District (Aikawa Town and Kiyokawa Village). (Tap to open answers)
How much does it cost to install solar panels and storage batteries in Aikou District (Aikawa Town and Kiyokawa Village)?
The cost varies depending on the installation capacity, equipment, and condition of the roof. In the above construction example (solar panel 4.3kW + storage battery, completed in April 2025), it was 2.2 million yen to 2.3 million yen.
Guidelines for different capacities are published on our solar panel and storage battery installation pricing page. We will create a layout diagram from the drawings and on-site survey and provide a free estimate!
Are there any subsidies available for solar and storage battery installation in Aikou District (Aikawa Town and Kiyokawa Village)?
As of October 6, 2026, Aikawa Town has the “Smart Energy Equipment Installation Subsidy” (10,000 yen per kW for solar, up to 30,000 yen; for storage batteries, half of the installation cost, up to 50,000 yen), and Kiyokawa Village has the “Residential Smart Energy Equipment Installation Subsidy” (15,000 yen per kW for solar, up to 50,000 yen; a fixed amount of 50,000 yen for storage batteries). Aikawa Town is on a first-come, first-served basis until the planned number is reached, while Kiyokawa Village is provided within the budget. Kanagawa Prefecture’s subsidy (70,000 yen/kW for solar; 150,000 yen/unit for storage batteries) reached its budget on September 7 for the second phase of Reiwa 8 and has closed, and the national DR household storage battery project has ended its public recruitment.
Since the application status may change, please refer to the subsidy and grant section and consult us before signing a contract.
Can I apply for subsidies after the construction is completed?
This depends on the system. For Aikawa Town’s subsidy, you must submit a planned application before installation and apply for the grant after installation, as stipulated in the guidelines, so please confirm with the town before starting work. Kiyokawa Village’s subsidy requires applications within the fiscal year in which the installation or purchase date falls. On the other hand, Kanagawa Prefecture’s residential subsidy requires “starting construction after grant approval,” and starting work beforehand will make you ineligible.
The order of procedures varies by system, so please confirm before signing a contract or starting work.
Can solar panels be installed on a slate roof? I’m worried about leaks.
It is possible to install on a slate roof, but it is necessary to check the condition of the roofing material and substrate. The fixing method varies by construction method, and if the method involves fixing brackets to the roofing material or substrate, waterproofing treatment of the fixed parts is essential.
Kakeru Koumuten is a specialist in exterior renovations strong in roofing work, so we will check the condition of the roof before installation and suggest methods such as roof overlay or replacement if deterioration is advanced.
The roof is old. Should I do a roof renovation first?
It depends on the condition of the roof. If a roof renovation is needed within 10 to 20 years after installation, the cost of removing and reinstalling the solar panels will be incurred separately. If the remaining lifespan of the roof is short, renovating to a highly durable roofing material before installation may help reduce total costs.
After confirming the condition of the roof during the on-site inspection, please consult us on how to proceed with the installation!
Is it better to install a storage battery together with solar panels?
If you want to use the generated electricity at night or prepare for power outages, simultaneous installation is recommended. The selling price for electricity will be 8.3 yen/kWh after the fifth year, making it more advantageous to use it in your home rather than selling it.
Additionally, the subsidies in Kanagawa Prefecture require the simultaneous introduction of solar panels and storage batteries. In the subsidies for Aikawa Town and Kiyokawa Village, storage batteries are designated as eligible equipment (Aikawa Town covers half of the installation cost, up to 50,000 yen; Kiyokawa Village offers a fixed amount of 50,000 yen). You can compare “solar panels only” and “solar panels + storage batteries” through a financial simulation.
How many kW can be installed on my roof? Is it okay for north-facing roofs or roofs with shadows?
The capacity that can be installed varies depending on the shape, orientation, and size of the roof. At Kakeru Koumuten, we create a layout diagram from the drawings and on-site inspection, and we will provide you with the installation capacity and power generation simulation.
Aikou District has varied terrain, including plateaus and mountains in Aikawa Town and forests in Kiyokawa Village, and the shading from surrounding buildings and trees, as well as the installable capacity, differs from house to house. You can check the expected power generation through the power generation simulation.
How long is the construction period?
In the above construction example (solar panels 4.3 kW + storage battery), it took about 3 days. The duration may vary if roof work is performed simultaneously or depending on the shape of the roof and installation capacity.
Please note that additional time is required for applications for subsidies and power companies, so please consult us as soon as possible.
What is the current selling price (FIT)?
For residential use (less than 10 kW), the selling price from certifications after October 2025 will be 24 yen/kWh for the first 4 years, and 8.3 yen/kWh from the 5th to the 10th year, and the same price will apply for the 2026 fiscal year.
The idea is to recover the initial costs quickly in the first 4 years and then focus on self-consumption. Kakeru Koumuten provides a financial simulation that takes into account loan interest rates and electricity costs.
Can you handle maintenance and inspections after installation?
Yes, we can. Kakeru Koumuten sends out annual after-service maintenance notices via DM and visits customers who wish to have inspections. We can also clean solar panels with a special brush if the power generation decreases due to dirt.
It can be difficult to check areas on the roof by yourself, so please feel free to consult us if you have any concerns.
Can you also handle renovations for roofs that already have solar panels installed?
Yes, we can. Kakeru Koumuten can detach and reattach solar panels in-house, allowing us to remove the panels, perform roof overlay (cover method) or re-roofing, and then reinstall them all in one process. The removed panels can be stored in our warehouse.
For costs, please refer to the solar panel detachment and water heater removal pricing page.
If you are looking for a solar panel installation contractor in Aikou District (Aikawa Town and Kiyokawa Village), please consult Kakeru Koumuten
Our company handles many exterior renovations, including solar panels, roof work, and exterior wall work in Aikou District (Aikawa Town and Kiyokawa Village).
We receive requests from many customers, including renovation companies and real estate agencies!
Kakeru Koumuten promises “high-quality renovations at low cost”, and we have received great feedback from numerous customers.
We continue to update our construction achievements every year, and we will strive to improve quality to satisfy even more customers in the future.
Our company can perform all exterior renovations, including roof overlay work, roof replacement work, partial roof repairs, exterior painting, and exterior cover methods, all by our own team.
We are also happy to handle small jobs such as partial repairs and rain gutter cleaning!
In urgent cases such as leak repairs, we may be able to provide temporary measures without setting up scaffolding, as long as safety can be ensured, so please consult with us!
“I want to know about recommended solar panels”, “I want to keep costs down as much as possible”, “I just want an estimate for now”, we will provide the best solutions for your specific requests.
We will never propose unnecessary work that prioritizes profit!
We always stand in the customer’s position and will propose the optimal construction plan!
We are confident that we will not lose in terms of cost, quality, and planning compared to other companies in exterior construction!
We are confident, so we welcome competitive quotes!
Estimates are completely free, and if our company is found to be inferior to others, you are free to decline!
Characteristics of Aikou District (Aikawa Town and Kiyokawa Village) and Points for Solar Construction
Aikou District consists of two municipalities: Aikawa Town and Kiyokawa Village. Aikawa Town is located in the central northern part of Kanagawa Prefecture, with mountains in the west, including the highest peak, Bukkazan, and a plateau around 100 meters above sea level between the Sagami River and Nakatsu River in the southeast. Kiyokawa Village is the only village in Kanagawa Prefecture, located at the eastern foot of the Tanzawa Mountains in the northwestern part of Kanagawa Prefecture, with 89% of its area covered by forests. We have summarized the characteristics of the terrain in Aikou District and points to consider when installing solar panels and storage batteries below. (Tap to open)
View the characteristics of Aikou District (Aikawa Town and Kiyokawa Village) and points for solar construction
■ Aikawa Town with plains and mountainous areas, and Kiyokawa Village with abundant forests. Site and delivery route will be confirmed on-site
Aikawa Town has mountainous areas in the west and plains in the southeast, and Kiyokawa Village has 89% of its area covered by forests. Even within the same town or village, the planning of scaffolding and the delivery routes for equipment and materials such as panels and storage batteries will vary depending on the elevation differences of each site and the width of the front road. Kakeru Koumuten Co., Ltd. plans scaffolding to match the site, even in cases of elevation differences, using its own scaffolding team and owned scaffolding materials.
■ For sites near rivers, confirm the placement of equipment using hazard maps
The southeastern part of Aikawa Town is a plateau situated between the Sagami River and Nakatsu River, and Kiyokawa Village has the Koayu River flowing through Suigatani, and the Nakatsu and Hayato Rivers flowing through Miyagase. The appropriate placement for equipment such as storage batteries and power conditioners varies depending on the surrounding environment of the installation site (e.g., whether it is prone to water accumulation). Please check the information about your area using hazard maps and consult with us regarding the installation location.
■ In areas with abundant forests, check for shadows, fallen leaves, and dirt from trees for each house
In regions like Kiyokawa Village, where forests occupy a large proportion, the amount of electricity generated can vary due to the extent of shadows, fallen leaves, and dirt caused by surrounding trees. Before installation, we will check the roof orientation, slope, and surrounding conditions on-site, and if the electricity generation decreases after installation, we can also provide cleaning of the solar panels with a dedicated brush and rain gutter cleaning.
■ Roof types and ages vary for each house. Check the roof and waterproofing before installation
Even in regions with similar terrain, the types of roofs, their ages, and sunlight exposure vary for each house. Kakeru Koumuten Co., Ltd. will confirm the type and condition of the roof and the site conditions before installation, and propose methods for securing and waterproofing, as well as scaffolding plans.
■ Reference value in the prefecture: Annual sunshine hours in Yokohama is about 2,018 hours
According to the Japan Meteorological Agency’s average values (1991–2020), the annual sunshine hours at the observation point in Kanagawa Prefecture, Yokohama, is about 2,018 hours. Monthly, August (about 206 hours) has the most, while June during the rainy season (about 136 hours) has the least.
Electricity generation in Aikou District also varies due to terrain and surrounding shadows, so conducting an annual electricity generation simulation and selecting the capacity of storage batteries to match peak electricity usage times is essential.
Our company is based in Kanagawa Prefecture and handles many exterior construction and solar projects in Aikou District (Aikawa Town and Kiyokawa Village).
We are happy to assist with partial roof repairs such as roof overlay work, roof replacement, and leak repairs, as well as other repairs! Please feel free to consult us for any urgent issues!
Service Area in Aikou District (Aikawa Town and Kiyokawa Village)
Kakeru Koumuten Co., Ltd. accepts requests throughout Kanagawa Prefecture and Tokyo.
List of Areas in Aikou District (Aikawa Town and Kiyokawa Village)
Aikawa Town / Kiyokawa Village
・For exterior wall painting in Aikou District (Aikawa Town and Kiyokawa Village), trust Kakeru Koumuten Co., Ltd.!
・For roof renovations in Aikou District (Aikawa Town and Kiyokawa Village), trust Kakeru Koumuten Co., Ltd.!
・For exterior renovations in Aikou District (Aikawa Town and Kiyokawa Village), trust Kakeru Koumuten Co., Ltd.!
・Kakeru Koumuten Co., Ltd.’s construction achievements
・Kakeru Koumuten Co., Ltd.’s aftercare services
・Kakeru Koumuten Co., Ltd.’s construction menu and price list
・Kakeru Koumuten Co., Ltd.’s staff blog and announcements
・Explaining the importance of comparison estimates and key points!
・Top 12 solar power generation manufacturers! Features and selection tips included!
・What are the installation costs for solar power generation? Tips for reducing costs thoroughly explained!
・What are the best locations for installing solar power generation? Key points for site selection included!
・For solar power generation estimates, click here!
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contact Kakeru Koumuten Co., Ltd.
Kakeru Koumuten is a young company whose team is, on average, in their late twenties, but our skills are second to none.
Our greatest strength is that we handle scaffolding, roofing and painting entirely in-house. In an industry where these tasks are usually divided among contractors, our complete service simplifies project management and helps keep costs down. Above all, if a problem arises, we respond promptly.
We proudly describe ourselves as the youngest and most helpful renovation company in Kanagawa!
