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 storage battery installation in
Aikou District (Aikawa Town and Kiyokawa Village),
Kakeru Koumuten is at your service!
Kakeru Koumuten is a company specializing in exterior renovations based in Kanagawa Prefecture.
As a company strong in roofing work, we are entrusted withsolar panel and storage 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 Storage 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 a satisfactory solar panel installation, we recommend obtainingthree or so estimates!
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 Installing Solar Panels
- Possible Subsidies and Grants Available 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-Estimate and Profit Simulation 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 Consider 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 Key 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)
Here are the reasons why our company is entrusted with solar panel installation by customers in Aikou District (Aikawa Town and Kiyokawa Village)
“Our Unique Strengths in Solar Panel Installation That Cannot Be Imitated by Other Companies”
have received high praise from many customers.
Because we are confident, we welcome estimates from any number of companies!
1. We Also Handle Exterior Renovations Beyond Solar Panel Installation!
Problems such as leaks that occur with solar panel installations may be caused by insufficient checks on the roof and waterproofing at the installation site.
Even if one is knowledgeable about solar panels, there are cases where the roof and waterproofing at the installation site are outside their expertise, so caution is necessary.
It is reassuring to have expertise in roofing to avoid maintenance issues 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 low-cost, high-quality solar and exterior renovation work.
We have established five bases centered around Yokohama City, Kanagawa Prefecture for material storage and showrooms.
In-house Ownership of Scaffolding Materials
To ensure safety during work on the roof, we own the scaffolding materials necessary for temporary scaffolding according to construction conditions and can assemble scaffolding in-house.
By not outsourcing scaffolding work and using our own scaffolding team, we can also cut costs for scaffolding work.
We own scaffolding materials for approximately 50 single-family homes!
Even in cases where there are elevation differences on the site, our in-house scaffolding team will plan the scaffolding according to the site conditions.
Storage of Materials in Our Large 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 a stock of roofing materials, allowing us torespond 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 Remodeling Dedicated Showroom
In the showroom, not only can you have meetings, but you can also
check the actual foundation brackets for solar panels and how they are installed on roofing materials!
We can also provide simulations of the revenue and installation costs when introducing solar panels!
Since roofing and exterior wall work often accompany each other, we also have 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 a consistent system from inquiry to project completion, Kakeru Koumuten can provide high-quality roof renovations at reduced costs.
Additionally, one representative will handle everything from the estimate to the completion of the work.
Since the same person will manage the sales and construction oversight, smooth communication is ensured.
We can provide consistent in-house construction from temporary scaffolding installation, exterior wall painting, to roof renovations!
4. Various Permits and Skilled Workers
We have obtained construction industry permits as well as permits for industrial waste collection and transportation!
We also have nationally certified sheet metal and painting technicians on staff, giving us confidence in our construction techniques.
We are capable of handling large-scale roof projects such as factories!
5. Warranty and Aftercare
In addition to the manufacturer’s warranty for solar panel installation, we also provide our own construction warranty (leak warranty)!
(The construction warranty for solar panel installation is 10 years. Depending on the condition of the roof before installation, it may be necessary to perform roof renovations to qualify for the warranty. The construction warranty is separate from the manufacturer’s product warranty, and the scope and conditions vary based on the warranty details.)
Aftercare is available annually, and we send out notification DM each year.
If you have any 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 cannot access the roof at high altitudes, we can utilize a drone for inspections!
During leak investigations, we can also conduct surveys using a thermal imaging camera.
If the power generation of the solar panels decreases due to dirt, we can provide cleaning services using a specialized brush.
We will respond according to the customer’s 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 installation 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.
Even customers who are not familiar with solar installations will receive materials that clearly outline important points and disadvantages!
We encourage you to obtain comparative estimates and review plans from other companies!
Roof Inspection Before Installing Solar Panels
Once solar panels are installed, they will remain on the roof for 20 or 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, specializing 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 (rooftop waterproofing). If the remaining lifespan of the roofing material is short, we may suggest roof renovation first. |
| 2. Condition of the Substrate and Waterproof Sheet | If the sheathing boards or roofing (waterproof sheet) under the roofing material are damaged, it will affect the fastening strength and waterproofing. We will also check for any signs of leaks. |
| 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, will affect the 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 shape and size of the roof determine the number of panels that can be installed (installation capacity). 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 check whether the method involves drilling holes in the roofing material for fixing or using brackets to secure the roofing material. The fixing method varies by technique, so please confirm 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 also be an option if necessary. |
| 7. Installation Location of Equipment and Wiring | We will confirm 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 will also affect the cost. |
| 8. Ease of Scaffolding Setup and Delivery Route | If there is a height difference on the site, planning for scaffolding and the delivery route for equipment and materials may require some ingenuity. The width of the front road and the elevation differences on the site will also be checked during the on-site survey. |
Fixing Methods and Confirmation Points 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 fixing 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 suitable for the type of tile (even methods that do not drill holes in the tiles will secure to the substrate) | Type and condition of tiles, substrate, load-bearing capacity. Depending on the investigation results, there may be a method to replace with lighter 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, a method that does 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 plan to renovate the roof 10 to 20 years after installation, additional costs for removing and reinstalling solar panels will apply. 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!
▶ For information on roof renovations in Aikogun (Aikawa Town and Kiyokawa Village), click here
PossibleSubsidies and Grants in Aikogun, Kanagawa Prefecture (Aikawa Town and Kiyokawa Village)
If you are introducing solar panels or storage batteries in Aikogun (Aikawa Town and Kiyokawa Village), the systems from the “National Government,” “Kanagawa Prefecture,” and your local “Aikawa Town” or “Kiyokawa Village” may be applicable.
The following information is based on the official pages of each system 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 occur between January 1 of the previous year and February 15 of the current year. The guidelines specify that a pre-application notice must be submitted before installation, followed by a subsidy application after installation. | Solar: 10,000 yen per kW (up to 30,000 yen). An additional 20,000 yen for total output of 5.0 kW or more (excluding expansions) Storage battery: 1/2 of installation cost (up to 50,000 yen) |
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 paid all village taxes (tenants require landlord approval. Installations for commercial purposes are not eligible). Only unused items are eligible, and storage batteries must be registered products with 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 yen per kW (up to 50,000 yen) Storage battery: Fixed amount of 50,000 yen If combining multiple devices, the total limit is 100,000 yen. |
The guidelines (effective April 1, 2025) state that subsidies will be provided within the budget limits. Please confirm the application status with the village before contracting. |
| Kanagawa Prefecture “Reiwa 8 Year 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 submitted by the individual, and construction can begin after the subsidy decision. | Solar: 70,000 yen per kW Storage battery: 150,000 yen 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. Future recruitment will be confirmed on the prefecture’s official page. |
| National “DR Home Storage Battery Project” (Reiwa 7 Fiscal Year Supplement) | 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 34,500 yen per 1 kWh (subsidy rate within 30% and a maximum of 600,000 yen 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 public 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 renovations such as window (opening) and structural insulation improvements; applications cannot be made for just the installation of storage batteries. Solar panels are not included as eligible equipment. | Storage battery: 96,000 yen per unit | Ends once the budget limit is reached. As of October 5, 2026, the official site shows that renovation applications account for 8% of the budget. Please check the official site for application status. |
| Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Self-Consumption Renewable Energy Introduction Subsidy” | Corporations and individual business owners filing blue returns (individual residences are not eligible). Solar power must have a generation output of 10kW or more, for business facilities, and equipment not certified under FIT/FIP, etc. | Solar power: 80,000 JPY/kW, etc. Storage systems: 50,000 JPY/kWh (up to 5,000,000 JPY) |
Application period ends on September 3, 2026 (when the application amount reaches 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, and applications must be made within the fiscal year in which the installation or purchase date falls. For Kanagawa Prefecture’s residential subsidies, construction must begin after receiving “grant approval”; starting work beforehand will disqualify the application. Eligibility conditions, application procedures, and the possibility of combining different programs vary by system, and applying does not guarantee funding, so please confirm before contracting or starting work.
At Kakeru Koumuten, we will guide you on the eligibility conditions and application periods for each program after confirming them.
National Subsidy “DR Home Storage Battery Project (Support Project for Home Storage System Introduction 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 introducing new registered products of storage systems that can be utilized for demand response (DR), and in the Reiwa 7 fiscal year supplementary project, 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 grant approval are not eligible.
However, the Reiwa 7 fiscal year supplementary application amount reached the budget on May 29, 2026, and the public recruitment has ended. The official site also states that there are no plans to reopen the public recruitment, and applications are currently not possible. Please check the official site 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 site of the DR Home Storage Battery Project
Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Residential Solar Power Generation and 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 1kW of solar power generation and 150,000 JPY per storage system.
For example, if you introduce a 4kW solar panel and one storage battery, the subsidy amount would be calculated as 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, 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 phase (May 11 – June 30) and the second phase (starting September 7, first-come-first-served) were accepted, and the second phase was closed on September 7, 2026, when 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 Introduction of Self-Consumption Type Renewable Energy” (for businesses)
Kanagawa Prefecture also provides subsidies for businesses introducing “self-consumption type” facilities that use electricity generated by solar panels.
The target is corporations or individual business owners filing blue returns, and the introduction to individual residences is not eligible.
Conditions include that solar power generation must have a generation output of 10 kW or more and supply electricity to business facilities within the prefecture, and it must be equipment 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 (with a maximum of 5 million yen).
For the fiscal year Reiwa 8, the application amount reached the budget amount, so recruitment was closed on September 3, 2026.
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 Introduction Subsidy (Fiscal Year Reiwa 8)”
This is a subsidy 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 (maximum 30,000 yen). If the total output is 5.0 kW or more, a large capacity addition of 20,000 yen (excluding expansions) is provided.
● Residential energy storage battery system: 1/2 of the introduction cost (maximum 50,000 yen)
The target is individuals who have resident registration in the town and have 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, it is stipulated that a planned application notice 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 applications 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 possibility of 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, etc.”
This is a subsidy for solar power generation systems and storage batteries installed in residential homes within the village.
● Solar Power Generation System: 15,000 yen per kW (up to 50,000 yen)
● Storage Battery: Fixed amount of 50,000 yen
● If combining multiple systems, the total limit is 100,000 yen
Eligible applicants are those who reside in the village and have paid their village taxes in full; if a tenant, consent from the landlord is required. Builders or businesses installing for sales purposes, and 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 Co-Creation Initiative (SII). Applications must be made 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 possibility of 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 related to Solar Panel Removal and Hot Water Heater Dismantling
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 (kilowatts). Storage batteries are compared based on the amount of electricity they can store, expressed in kWh (kilowatt-hours).
The amount of kW that can be installed on a roof varies for each house based on the roof’s shape, orientation, and size. 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 panel costs as 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 rough estimates and can vary based on wiring length, scaffolding range, existing roofing materials, panel layout, etc.)
▶ Service Menu | Click here for costs related to 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 based solely on price. 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) should be specified. |
| 2. Power Conditioner | Manufacturer, model number, capacity, number of units, installation location (indoor/outdoor). Also check if it is a type that controls with a battery. |
| 3. 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 is a method that drills holes or a method that grips and secures). |
| 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 | How much support is included for applications to the power company, certification applications for selling electricity (FIT), and subsidy applications. |
| 8. Scaffolding | Scope and quantity of scaffolding. If roof 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 it is tax-inclusive or tax-excluded, conditions under which additional costs may arise, details and duration of manufacturer warranty and workmanship warranty. |
If the capacity is different, both the price and power generation will change. Kakeru Koumuten Co., Ltd. warmly welcomes comparative 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 an approximate 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 battery, you can get an approximate 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 Voices
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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 |
| Base Mounting Hardware Used |
| Niigata Manufacturing / Aluminum Catch Type Hardware |
| Fixing Method & Waterproofing Arrangement |
| Fixed by catching the horizontal metal roof with catch type hardware (Catch Method) |
| Price Range |
| 2,200,000 JPY – 2,300,000 JPY *Due to the subsidy being granted, the actual burden amount is approximately 1,000,000 JPY Estimated recovery period for construction costs: about 8-9 years (self-consumption) *The subsidy 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 subsidies are available, and I would like to know how much will be granted. |
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 subsidy to be granted, and we explained this 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 that serve Aikou District (Aikawa Town and Kiyokawa Village), and you may be unsure which contractor to choose.
Therefore,when requesting solar panel installation or battery storage installation work, make sure to check the following 4 points.
● Have extensive knowledge not only about solar panels but also about roofs
● Confirm the presence of warranties and after-sales maintenance
● Obtain estimates from multiple contractors (3 companies is a guideline)
● Check 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
Defective installation of solar panels can sometimes 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 were installed on a severely deteriorated roof, leading to leaks
・Solar panels were installed on a roof with a short lifespan, requiring reinstallation within a few years
・Incorrect processing due to misjudging the type of waterproofing, resulting in leaks
and more
When installing solar panels, understanding the condition and type of the existing roof allows you to avoid unnecessary expenses and unexpected troubles.
▶ Go to “Roof Verification Before Installing Solar Panels” in this article
Confirm the presence of warranties and after-sales maintenance
When choosing a solar installation contractor, make sure to check for warranties. It is important to verify not only the duration of the warranty but also the coverage, exclusions, and cost conditions.
Solar panels and battery storage come with manufacturer warranties, but also check for the presence 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 within the warranty period and conditions.
Additionally, some contractors provide after-sales services separate from warranties, so be sure to check if the contractor you are considering has after-sales service.
Since abnormalities or damage on the roof can be in hidden areas, you may not notice them yourself.
By conducting inspections of hidden areas through after-sales maintenance, you can more easily detect abnormalities early and prevent major repairs or breakdowns!
At Kakeru Koumuten Co., Ltd., the installation of solar panels comes with a leak warranty as part of our workmanship warranty. (The warranty for solar panel installation is 10 years, and depending on the condition of the roof before installation, we may not be able to provide a warranty unless roof remodeling is performed.)
We also conduct aftercare maintenance and send out annual DM!
After checking the DM, if you wish, we will visit you for aftercare maintenance!
Obtain estimates from multiple contractors (3 companies as a guideline)
When requesting the installation of solar panels, 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 your desired contractor at a lower price, we recommend obtaining estimates from multiple contractors.
When comparing estimates,
“Check the estimate items”
“Type of solar panels”
“Warranties and after-sales services”
let’s carefully compare and make a judgment! If the rank of auxiliary materials is low or if steps are skipped, costs can be reduced, so avoid judging solely based on price!
▶ Go 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 the installation of solar panels and storage batteries, 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 that supports 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 grant will be provided after review! (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 ten 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 as “24 yen/kWh for the first four years, and 8.3 yen/kWh from the fifth to the tenth year” for certifications after October 2025, and the same price will apply for the 2026 fiscal year. After the fifth year, it is likely to be more advantageous to use it at home (self-consumption) rather than selling it, so combining it with a storage battery is also an option.
👉 Ministry of Economy, Trade and Industry | For purchase prices and periods, click here
Advantage 2 You can utilize subsidies!
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 amount through subsidies is a significant advantage!
In the case of Aikou District, you may be eligible for 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 do have operational noise.)
Advantage 4 Heat insulation effects are expected!!
By installing panels on the roof or rooftop, they block direct sunlight from hitting the roof.
Especially in summer, this can help reduce the temperature of the roof, providing a heat insulation effect!
（This does not improve the insulation performance of the building itself）
Benefit 5 Electricity can be used even during power outages!!
If a storage battery is installed, it is 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 capability, 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 particularly overlooked maintenance cost is for the roof where solar panels are installed.
If you perform roof renovations 10 to 20 years later, there will be costs for removing and reinstalling the solar panels.
If the existing roof is deteriorating, it is reassuring to renovate it with durable roofing materials before installing 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 would be reassuring to ask for a simulation considering 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 involve making holes in the roof, the risk of leaks inevitably arises.
Of course, we will perform thorough waterproofing, but if you are concerned about making holes, replacing the roofing material with a metal roof and fixing the solar panels using the catch method is also an option. (The catch method has compatibility conditions between the roofing material and hardware, and cannot be used with all metal roofs)
Catch-type base metal fittings for horizontal metal roofs
Note 3: The roof will become heavier
Since solar panels will be installed, the roof will become heavier. After investigating the existing roof, substrate, and load capacity, one option may be to replace it with a lighter roof 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!
Choosing Method 1: Compare based on total output of the roof
When installing solar panels on the roof, it is important to know how much electricity can be generated in a limited area, and it is better to generate more electricity!
Solar panels vary in size and output depending on the manufacturer.
A panel with an output of 350W and a panel with an output of 400W may seem that the higher output panel is better at first glance.
However, if the size of the panel does not fit well with 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 numbers of panels that can be installed on the same roof due to size differences.
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 (kWh) will vary depending on conditions such as the roof’s orientation, slope, and shading.
Choosing Method 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 reduction 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 itself.
Choosing solar panels without considering only the initial output but also the degradation rate will lead to a regret-free selection!
Choosing Method 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.
For output warranties, some manufacturers offer a 30-year warranty while others provide a 10-year warranty, so it varies widely!
It’s always better to have a longer warranty, so let’s check the warranty periods and conditions of the manufacturers you are considering!
Frequently Asked Questions about Solar Panel 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 the 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.
For cost estimates by capacity, please refer to the solar panel installation 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 panel 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 panels, 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 panels, 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 of applications is reached, while Kiyokawa Village is provided within the budget limits. The Kanagawa Prefecture subsidy (70,000 yen/kW for solar panels, 150,000 yen per unit for storage batteries) reached the budget amount for the second phase of fiscal year 2026 on September 7 and has been closed, and the national DR household storage battery project has ended its public recruitment.
Since the application status may change, please check the subsidy and grant section and consult with us before signing a contract.
Can I apply for subsidies even after the construction is completed?
This depends on the system. For Aikawa Town’s subsidy, you need to submit a pre-application notice before installation and then apply for the grant after installation, 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, the Kanagawa Prefecture residential subsidy requires “starting construction after the grant decision,” and if you start work beforehand, you will be ineligible.
The order of procedures varies by system, so please confirm before signing a contract or starting work.
Can solar panels be installed on slate roofs? I’m worried about leaks.
It is possible to install on slate roofs, but it is necessary to check the condition of the roofing material and substrate. The fixing method varies by construction method, and in methods that fix brackets to the roofing material or substrate, waterproofing treatment of the fixed parts is essential.
Kakeru Koumuten Co., Ltd. is a specialized exterior renovation company strong in roofing work, so we will check the condition of the roof before installation. If deterioration is progressing, we can also suggest methods such as roof overlay (cover method) or complete replacement before installation.
My roof is old. Should I do a roof renovation first?
It depends on the condition of the roof. If a roof renovation is needed after 10 to 20 years of installation, there will be additional costs for removing and reinstalling solar panels. If the remaining lifespan of the roof is short, it may be more cost-effective to renovate with durable roofing materials before installation.
Please consult us on how to proceed with the installation after confirming the condition of the roof through a site survey!
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 Aikawa Town and Kiyokawa Village, storage batteries are designated as eligible equipment for subsidies (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 only” and “solar + storage battery” in 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 site survey, and 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, so the shading from surrounding buildings and trees and the installable capacity differ for each house. You can check the expected power generation through the power generation simulation.
How long does the construction period take?
For the above construction example (solar panel 4.3 kW + storage battery), it took about 3 days. The duration may vary if roofing work is done simultaneously or depending on the shape of the roof and installation capacity.
Also, please note that there will be additional time required for applications for subsidies and power companies, so please consult us early.
What is the current selling price (FIT)?
For residential use (less than 10 kW), from the certification after October 2025, the first 4 years will be 24 yen/kWh, and from the 5th to the 10th year, it will be 8.3 yen/kWh, and the same price will apply for the 2026 fiscal year.
The idea is to recover initial costs quickly in the first four years, and then focus on self-consumption. Kakeru Koumuten provides a financial simulation that considers loan interest rates and electricity costs.
Can you handle maintenance and inspections after installation?
Yes, we can. Kakeru Koumuten sends out annual after-maintenance DM notices and visits for inspections upon request from customers. We can also clean solar panels with a special brush if the power generation decreases due to dirt.
Since it is difficult to check areas on the roof by yourself, please feel free to consult us if you have any concerns.
Can you also renovate roofs that already have solar panels installed?
It is possible. Kakeru Koumuten Co., Ltd. can detach and reattach solar panels in-house, allowing us to perform roof overlay (cover method) or re-roofing after removing the panels, and we will handle everything consistently until reinstallation. The removed panels can be stored in our own 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, 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, 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 annual construction achievements and will strive to improve quality to satisfy even more customers in the future.
Our company can perform all exterior renovations, not only roof overlay (cover method) and re-roofing but also partial roof repairs, exterior painting, and exterior wall cover methods.
We are also happy to handle small jobs like partial repairs and rain gutter cleaning!
In urgent cases like leak repairs, we may be able to provide emergency measures without setting up scaffolding, as long as safety can be ensured, so please consult with us!
“I want to know 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 welcome competitive estimates with confidence!
Estimates are completely free, and if you find our company to be inferior to others, you are free to decline!
Characteristics of Aikou District (Aikawa Town, Kiyokawa Village) and points of 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 mountainous areas in the west, including the highest peak, Fukkazan, and a plateau around 100 meters above sea level in the southeastern part, situated between the Sagami River and Nakatsu River. Kiyokawa Village is the only village in Kanagawa Prefecture, located at the eastern foot of the Tanzawa Mountains in the northwestern part of the prefecture, with 89% of its area covered by forests. We have summarized the characteristics of 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 has plateaus and mountains, while Kiyokawa Village has many forests. Check the site and delivery routes on-site.
Aikawa Town has mountainous areas in the west and plateaus in the southeastern part, while Kiyokawa Village is noted for having 89% of its area covered by forests. Even within the same town or village, the height differences of each site and the width of the front road can change the plans for scaffolding and the delivery routes for equipment and materials such as panels and storage batteries. Kakeru Koumuten Co., Ltd. plans scaffolding to fit the site even when there are height differences, using its own scaffolding team and materials.
■ For sites near rivers, check 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 Koayugawa flowing through Suigaya and Nakatsugawa and Hayato River flowing through Miyagase. The placement of equipment such as storage batteries and power conditioners can vary 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 us regarding the installation location.
■ In areas with many forests, check for shadows, fallen leaves, and dirt from trees for each house.
In regions like Kiyokawa Village, where a large proportion is covered by forests, the shadows cast by surrounding trees, as well as the accumulation of fallen leaves and dirt, can affect power generation. Before installation, we will check the orientation and slope of the roof and the surrounding conditions on-site. If power generation decreases after installation, we can also provide cleaning of the solar panels with specialized brushes and rain gutter cleaning.
■ The types and ages of roofs vary for each house. Check the roof and waterproofing before installation.
Even in areas with similar terrain, the types of roofs, their ages, and sunlight exposure vary for each house. At Kakeru Koumuten Co., Ltd., we will check the type and condition of the roof and the site conditions before installation and propose methods for securing the installation, waterproofing details, and scaffolding plans.
■ Reference value in the prefecture: The annual sunshine hours in Yokohama are approximately 2,018 hours.
Meteorological Agency’s average values (1991-2020) indicate that the annual sunshine hours in Yokohama, a weather observation point in Kanagawa Prefecture, 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.
The power generation in Aikou District varies due to terrain and surrounding shadows, so conducting an annual power generation simulation and selecting the battery capacity according to the times of high electricity usage are key points.
Our company is based in Kanagawa Prefecture and handles many exterior construction and solar power 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 about any sudden troubles!
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. project achievements
・Kakeru Koumuten Co., Ltd. aftercare services
・Kakeru Koumuten Co., Ltd. service menu and price list
・Kakeru Koumuten Co., Ltd. staff blog and announcements
・Explaining the importance of comparative estimates and key points!
・Top 12 solar power manufacturers! Features and selection tips included!
・What are the installation costs for solar power? Comprehensive tips to reduce costs!
・What are the best locations for solar power installation? Key points for site selection included!
・Here for solar power estimates!
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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!
