Leave Your Solar Panel Installation in Minami, Sagamihara City to Kakeru Koumuten Co., Ltd.!
For Solar Panel and Storage Battery Installation in
Minami Ward, Sagamihara City,
trust Kakeru Koumuten!
Kakeru Koumuten is a specialized exterior renovation company headquartered in Aoba Ward, Yokohama City.
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 Minami Ward”
“Costs for Solar Panel and Storage Battery Installation”
“Subsidies Available for Solar System Installation in Minami Ward”
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 comparative estimates!
Table of Contents (Tap to Open/Close)
- Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Minami Ward, Sagamihara City
- Roof Inspection Before Installing Solar Panels
- Possible Subsidies and Grants Available in Minami Ward
- 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 Installer in Minami Ward, Sagamihara City
- Benefits of Introducing Solar Equipment
- Points to Note When Introducing Solar Power Generation
- How to Choose Solar Panels
- Frequently Asked Questions about Solar and Storage Battery Installation in Minami Ward
- If You Are Looking for a Solar Panel Installer in Minami Ward, Contact Kakeru Koumuten
- Characteristics of Minami Ward, Sagamihara City and Points for Solar Construction
- Service Area in Minami Ward, Sagamihara City
Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Minami Ward, Sagamihara City
The reasons our company is entrusted with solar panel installation by customers in Minami Ward, Sagamihara City include
one reason being that Kakeru Koumuten has a base in Kanagawa Prefecture,
and our unique strengths in solar panel installation that cannot be imitated by other companies
which have received high praise from many customers.
so we would be grateful if you could compare our estimates with those of other companies.
Because we are confident, we welcome multiple estimates!
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 be knowledgeable about the roof to avoid maintenance and troubles after construction!
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.Equipment 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 in 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 necessary scaffolding materials for temporary scaffolding according to construction conditions, allowing us to assemble scaffolding ourselves.
By performing scaffolding work with our own scaffolding team instead of outsourcing, we can also cut costs on scaffolding work.
We have scaffolding materials for approximately 50 single-family homes!
Even in residential areas of Minami Ward, where commercial, residential, and industrial districts are concentrated, our own scaffolding team will plan the scaffolding according to the site.
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, we canpurchase materials at a lower cost!
Additionally, since we always have stock of roofing materials, we can providequick responses 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 installed on the roofing materials!
It is also possible to simulate the revenue and installation costs when introducing solar panels!
Since roofing and exterior wall work often accompany each other, 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 all work performed by our own team.
By having a consistent system from inquiry to project completion, Kakeru Koumuten can provide high-quality roof remodeling at reduced costs.
Additionally, one representative will handle everything from the estimate to the completion of the work.
Since the person in charge does not change, whether it’s the sales representative or the construction management representative, smooth communication is possible.
We can perform consistent in-house work from temporary scaffolding installation to exterior wall painting and roof remodeling!
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 workers and painting technicians on staff, and we are confident in our construction techniques.
We are capable of handling large-scale roofing projects such as factories!
5. Warranty and Aftercare
In addition to the manufacturer’s warranty, our solar panel installation work comes with our own workmanship warranty (leakage warranty)!
(The workmanship 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 roof renovation is performed. The workmanship warranty is separate from the manufacturer’s product warranty, and the coverage and conditions vary based on the warranty details.)
Aftercare maintenance 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 roof troubles and situations.
Even if you cannot access the roof at high altitudes, we can utilize drones to assist!
During leakage investigations, we can also conduct inspections using a thermal imaging camera.
If the power generation of the solar panels decreases due to dirt, we can perform cleaning with a specialized brush.
We will respond according to the customer’s wishes.
7. Human Resource Development
To improve skills, we create various roof 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 Clear Materials and Simulations
At Kakeru Koumuten Co., Ltd., in addition to “estimates”, “layout diagrams”, and “power generation simulations”, we also provide a “solar panel 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 panel installation will receive easy-to-understand materials that include important points and disadvantages!
We encourage you to obtain comparative estimates and compare our plans with those of other companies!
Roof Inspection Before Installing Solar Panels
Once solar panels are installed, they will remain on the roof for 20 to 30 years.
Confirming “whether it is okay to install them directly on the current roof” before installation is the key point to prevent leaks and unnecessary expenses!
Kakeru Koumuten Co., Ltd., which specializes in roofing work, has summarized the items to check before installation.
| 1. Type of roofing material and age | The method of securing the panels varies depending on the roofing material, such as slate, tiles, metal roofs, or flat roofs (roof 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 or roofing (waterproof sheet) under the roofing material is damaged, it will affect the fastening strength and waterproofing. We will also check for any signs of leaks. |
| 3. Orientation, slope, and shading of the roof | The orientation and slope of the roof surface, as well as shading from neighboring houses, trees, and utility poles, will affect power generation. We will create a layout diagram from the drawings and the site, and you can check it with the power generation simulation. |
| 4. Shape of the roof and area available for installation | The number of panels (installation capacity) that can be installed is determined by the shape and size of the roof. The number of panels that can be installed will vary depending on the size of the panels, so we will compare based on the total output of the roof. |
| 5. Method of securing and waterproofing details | We will confirm whether the method involves drilling holes in the roofing material for fastening or using brackets to secure the roofing material. The method of securing will vary by technique, so please check the waterproofing treatment of the fastening 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, replacing with lighter roofing materials may also 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 will also affect costs. |
Securing Methods and Checkpoints by Roofing Material
| Roof Material | Main Fixing Method | Pre-Installation Check Points |
|---|---|---|
| Slate Roof | Varies by method (e.g., fixing brackets to the roof material and substrate with screws) | 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 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 investigation 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 roof material (depends on the combination of roof material and brackets) | Whether the roof material and brackets are compatible, installation conditions from the roof material manufacturer. If compatible, methods that do not drill holes may be selectable. |
| 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 carry out roof renovations 10 to 20 years after installation, there will be additional costs for removing and reinstalling solar panels. If the roof is deteriorating, renovating to high-durability roofing materials 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!
▶ Click here for roof renovations in Minami Ward, Sagamihara City
PossibleSubsidies and Grants
If you introduce solar panels or storage batteries in Minami Ward, you may be eligible for programs from the “National Government,” “Kanagawa Prefecture,” and “Sagami-hara City.”
The following is based on the information confirmed on the official pages of each program as of October 6, 2026. The application status may change depending on the budget and recruitment period, 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 |
|---|---|---|---|
| Sagamihara City “Reiwa 8 Year Residential Smart Energy Equipment Installation Subsidy” | Solar power generation systems, storage batteries, V2H (connection with solar power generation system is mandatory, applicable to both new and existing installations), ZEH, etc. Application after project completion, and in case of many applications, lottery | Solar: 80,000 JPY Storage battery or V2H: 200,000 JPY each ZEH: 300,000 JPY (LCCM housing adds 100,000 JPY) |
Phase 1: September 1-30, 2026 (Application closed) Phase 2: February 1-26, 2027 (must arrive by) (for installations completed between October 1, 2026, and February 26, 2027) |
| Sagamihara City “Reiwa 8 Year Zero Initial Cost Solar Power Generation Equipment Installation Subsidy” | Businesses registered in advance with the city that install solar power generation equipment in homes for zero initial cost (lease or electricity sales). Equipment is generally transferred free of charge after about 10 years. | Solar: 70,000 JPY/kW (up to 5 kW), plus an additional 30,000 JPY/kW for contractors within the city Storage battery: One-third of eligible expenses (up to 510,000 JPY) |
May 1, 2026 – January 29, 2027 (must arrive by) |
| Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Residential Solar Power Generation and Storage Battery Installation Subsidy” | Installation of both solar power generation and storage batteries in residential properties within the prefecture. Applications must be made by the individual, and construction can begin after the grant decision. | Solar: 70,000 JPY/kW Storage battery: 150,000 JPY/unit |
Phase 1: May 11 – June 30, 2026 Phase 2: September 7 – 30, 2026 (first-come, first-served) Phase 2 has reached its application deadline. Please check the prefecture’s official page for future applications. |
| National “DR Home Storage Battery Project” (Reiwa 7 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 1 kWh at 34,500 JPY (subsidy rate within 3/10, maximum 600,000 JPY per application) | As of May 29, 2026, the budget has been reached, and public applications have ended (applications are currently not accepted) |
| 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 the structure; applications cannot be made for just the installation of storage batteries. Solar panels are not included as eligible facilities | Storage battery: 96,000 JPY/unit | Ends as soon as the budget limit is reached. Please check the official site for application status. |
| Sagamihara City “Reiwa 8 Year Small and Medium-sized Business Energy-saving Equipment Installation Support Subsidy” | Small and medium-sized enterprises with a business office in the city (individual residences are not eligible). Submission of a global warming countermeasure plan is required, and there are special measures for solar power generation and storage batteries. | Subsidy rate within 1/3 (maximum 1,000,000 yen) | May 15, 2026 – October 30, 2026 (Eligible businesses that submitted their plans by September 30, 2026, can apply) |
| Kanagawa Prefecture “Fiscal Year 2026 Kanagawa Prefecture Subsidy for Introduction of Self-Consumption Type Renewable Energy” | Corporations and individual business owners filing blue returns (individual residences are not eligible). For solar power, a generation capacity of 10 kW or more, facilities for business use, and equipment not certified under FIT/FIP. | Solar power: 80,000 yen/kW, etc. Storage systems: 50,000 yen/kWh (maximum 5,000,000 yen) |
Application period ended on September 3, 2026 (when the application amount reached the budget amount) |
For Kanagawa Prefecture’s housing subsidies, it is a condition that construction starts only after receiving the “grant decision”, and grants are provided after completion of the work and submission of performance reports and reviews. On the other hand, the incentive program in Sagamihara City allows applications after project completion, with fixed ranges for the application period and installation completion date, and it is conducted by lottery. The order of procedures varies by program, and applying does not guarantee a grant, so please confirm before contracting and starting work.
Kakeru Koumuten will guide you on the eligibility conditions and business requirements for each program after confirming them.
Sagamihara City “Fiscal Year 2026 Housing Smart Energy Equipment Installation Incentive”
Sagamihara City provides incentives for those who install residential solar power generation systems, stationary lithium-ion storage batteries, V2H, ZEH, etc. Residents of the Minami Ward may also be eligible for the city’s program.
The incentive amounts are 80,000 yen for solar power generation systems, and 200,000 yen each for storage batteries or V2H (storage batteries and V2H must be interconnected with the solar power generation system, regardless of whether they are new or existing), and 300,000 yen for ZEH (an additional 100,000 yen for LCCM housing). The planned number of cases for fiscal year 2026 is 450 for solar power and 470 for storage batteries and V2H, with half of the applications accepted in each period.
Applications are made after the project is completed. If there are many applicants, a lottery will be held, and applications can be submitted by mail (must arrive) or at the counter.
The first application period for fiscal year 2026 (September 1 – 30, 2026) has ended. The second period is from February 1 to 26, 2027 (must arrive), targeting equipment completed between October 1, 2026, and February 26, 2027. Depending on national and prefectural subsidy programs, it may not be possible to combine them with the city’s incentives, so please confirm before applying. For detailed eligibility conditions and application methods, please check the official page of Sagamihara City.
👉 Click here for the official page of Sagamihara City
Sagamihara City “Fiscal Year 2026 Zero Initial Cost Solar Power Generation Equipment Installation Subsidy”
Sagamihara City also provides subsidies for a method where businesses bear the initial costs to install solar power generation equipment in residences, allowing homeowners to use it through leasing or electricity sales, known as “zero initial cost.” Generally, after about 10 years, the equipment is transferred free of charge.
The subsidy amount for solar power generation equipment is 70,000 yen per kW (up to 5 kW), and for contractors within the city, an additional 30,000 yen per kW is added. The subsidy for storage batteries covers one-third of the eligible expenses (up to a maximum of 510,000 yen). The eligible projects are those conducted by businesses registered in advance with the city, and the application period is from May 1, 2026, to January 29, 2027 (must arrive by this date).
👉 Click here for the official page of Sagamihara City
National Subsidy “DR Household Storage Battery Project (Support Project for the Introduction of Household Storage Systems for DR Resources)”
The national government has been implementing the “DR Household Storage Battery Project” to support the installation of household storage batteries.
This program targets those who are introducing new registered products’ storage systems that can be utilized for demand response (DR). In the fiscal year 2025 supplementary budget, the subsidy amount was determined based on a standard amount of 34,500 yen per initial effective capacity of 1 kWh, with a subsidy rate of up to 30% and a maximum of 600,000 yen per application. There are also conditions such as that contracts or orders made before the grant decision are not eligible.
However, the supplementary budget for fiscal year 2025 reached its budget on May 29, 2026, and the public offering has ended (the previous year’s supplementary budget for fiscal year 2024 also ended on July 2, 2025). Applications are currently not accepted, so please check the official website for future public offerings.
Additionally, there are currently no subsidies confirmed for the installation of solar panels on existing homes.
👉 Click here for the official site of the DR Household Storage Battery Project
Kanagawa Prefecture “Fiscal Year 2026 Kanagawa Prefecture Subsidy for the Introduction of Residential Solar Power Generation and Storage Batteries”
Kanagawa Prefecture provides subsidies for those who install both “solar panels” and “storage batteries” in their homes.
The subsidy details are 70,000 yen per kW for solar power generation and 150,000 yen per storage system.
For example, if you install a 4 kW solar panel and one storage battery, the subsidy amount will be calculated as 4 kW × 70,000 yen + 150,000 yen = 430,000 yen.
Storage systems must be registered products, and if construction begins before the grant decision, they will not be eligible. Applications must be made by the individual (applications by contractors on behalf are not allowed), and conditions regarding the combination with city incentives may vary by program, so please confirm.
In fiscal year 2026, the first phase (May 11 to June 30) and the second phase (September 7 to September 30, first-come-first-served) were accepted, and the second phase has reached its application deadline. For future recruitment, please check the official page of Kanagawa Prefecture.
👉 Click here for the official page of Kanagawa Prefecture
Sagami-hara City “Fiscal Year 2026 Subsidy for Energy-Saving Equipment Installation Support for Small and Medium-Sized Enterprises” (for businesses)
In Sagamihara City, subsidies for the introduction of energy-saving equipment and renewable energy facilities (including solar power generation and storage batteries) are provided for businesses that have offices within the city.
Eligible businesses must meet conditions such as having no delinquency in citizen tax or fixed asset tax and submitting a global warming countermeasure plan. Individual residential installations are not eligible.
The subsidy rate is within one-third (up to 1,000,000 yen). There are special measures for solar power and storage batteries.
The application period is from May 15, 2026, to October 30, 2026. Businesses that submit their plans by September 30, 2026, can apply.
Businesses considering the installation of solar panels in stores, offices, or factories within the Minami Ward should check the eligibility conditions for businesses and equipment on the official Sagamihara City page.
👉 Click here for the official Sagamihara City page
Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Self-Consumption Type Renewable Energy Introduction Subsidy” (for businesses)
Kanagawa Prefecture also provides subsidies for businesses that introduce “self-consumption type” facilities that use electricity generated by solar panels.
Eligible parties include corporations or individual businesses filing blue returns, and individual residential installations are not eligible.
Conditions include that the solar power generation must have an output of 10 kW or more and supply electricity to business facilities within the prefecture, and the equipment must not be 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 accompanying storage system (up to 5,000,000 yen).
The application for Reiwa 8 has closed as the application amount reached the budget amount on September 3, 2026.
Businesses considering the installation of solar panels on commercial buildings within the Minami Ward should check the official Kanagawa Prefecture page for the next application period.
👉 Click here for details
Solar Panel Installation & Storage Battery Installation Price List
⇧Service Menu | Click here for costs related to Solar Panel Installation and Battery Installation
⇧Service Menu | Click here for costs related to Solar Panel Removal and Water Heater Removal
Breakdown of Installation Capacity, Equipment, and Construction Costs
The costs for solar panels and 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.
Considerations for Installation Capacity (kW) and 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). Batteries are compared based on the amount of electricity they can store, represented in kWh (kilowatt-hour).
The amount of kW that can be placed on the 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 installation costs as follows: for 3–5 kW, the estimate is 800,000 JPY to 1,200,000 JPY, and for 6–10 kW, it is 1,200,000 JPY to 1,900,000 JPY. (These are just estimates and may vary based on factors such as wiring length, scaffolding area, existing roofing materials, and panel layout.)
▶ Installation Menu | Costs for Solar Panel Installation and Battery Installation
Items to Confirm in the Estimate (Cost Verification)
When comparing estimates, it’s common to compare different capacities and equipment. 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, and total installation capacity (kW) should be listed. |
| 2. Power Conditioner | Manufacturer, model number, capacity, number of units, and installation location (indoor/outdoor). Also confirm if it is a type that controls the battery together. |
| 3. Battery | Manufacturer, model number, capacity (kWh), range usable during power outages (entire house or specific circuits), and 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). |
| 5. Wiring and Electrical Work | Wiring route and length, work around the distribution board, and whether there is a monitor to check power generation. |
| 6. Roof Reinforcement and Waterproofing | Details of waterproofing treatment at the fixed points, and whether necessary roof repairs and substrate reinforcements are included. |
| 7. Applications | How much support is included for applications to the power company, feed-in tariff (FIT) certification, and subsidy applications. |
| 8. Scaffolding | Scope and quantity of scaffolding. If it is simultaneous with roofing work or exterior painting, check that the same scope and quantity are not double-counted. |
| 9. Removal and Disposal | Whether the removal of existing solar thermal water heaters or old panels and the disposal costs of waste materials are included. |
| 10. Tax Classification and Warranty | Whether the price is tax-inclusive or exclusive, conditions under which additional costs may arise, and details and duration of manufacturer and workmanship warranties. |
If the capacities differ, the costs and power generation will also change. Kakeru Koumuten Co., Ltd. welcome comparisons, so if you bring estimates from other companies, we can explain the differences for each item!
Self-Estimate and Profit Simulation for Solar Power Generation
With the simulator above,
you can get an estimated quote and a financial 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 get an estimated quote and financial simulation!
*The simulation results are estimates. Actual financial results may vary based on assumptions such as electricity rates, self-consumption ratios, selling prices, and costs for equipment inspection and replacement.
Customer Feedback
-
customer reviews
Asao-ku, Kawasaki City | We received reviews about the ridge cap and rain gutter replacement work!
-
customer reviews
Kohoku-ku, Yokohama | We received reviews about the roof overlay (cover method)!
-
customer reviews
Kohoku-ku, Yokohama | We Received Reviews About Exterior Painting!
-
customer reviews
Hodogaya-ku, Yokohama | We received reviews about our exterior fence construction!
-
customer reviews
Tsurumi-ku, Yokohama | We received reviews about roof and exterior wall painting, as well as metalwork and rain gutter replacement work!
-
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 Manufactured / Aluminum Catch Type Hardware |
| Fixing Method & Waterproofing Arrangement |
| Fixed by catching the horizontal metal roof with catch type hardware (Catch Method) |
| Price Range |
| 2.2 million yen to 2.3 million yen *Due to the grant being provided, the actual burden amount is approximately 1 million yen 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 |
| Approximately 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 can 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 Minami Ward, Sagamihara City
There are many solar panel installation contractors that serve Minami Ward, Sagamihara City, and you may be unsure which contractor to choose.
Therefore, when requesting solar panel installation and storage battery installation work, let’s check the following 4 points.
● Have extensive knowledge not only about solar power 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 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
・Incorrect processing due to misjudgment of the type of waterproofing, 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 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, let’s confirm the presence of warranties. It’s important to check not only the duration of the warranty but also the coverage, exclusions, and cost conditions.
While the solar panels and storage batteries come with a manufacturer’s warranty, also check for the presence of a workmanship warranty in case leaks occur after installation!
For contractors that offer a workmanship warranty, 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 service separate from warranties, so be sure to check if the contractor you are considering has after-sales service.
Changes or damage on the roof may occur in areas that are not visible, so there is a possibility that customers may not notice them.
By conducting inspections in after-sales maintenance, including areas that are not visible, it becomes easier to detect abnormalities early and prevent major repairs or failures!
Kakeru Koumuten Co., Ltd. provides 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, a roof renovation may be required to provide the warranty.)
We also conduct after-sales maintenance and send out DM every year!
Please check the DM, and if you wish, we will visit for after-sales maintenance!
Obtain estimates from multiple contractors (3 companies as a guideline)
When requesting the installation of solar panels, be sure to 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 desired contractor at a lower price, we recommend obtaining estimates from multiple contractors.
When comparing estimates, please check the following:
“Check the items in the estimate”
“Type of solar panels”
“Warranties and after-sales services”
Make sure to compare these details carefully! If the quality of the auxiliary materials is low or if steps are skipped, costs can be reduced, so avoid making judgments based solely on price!
▶ Go to “Breakdown of Installation Capacity and Equipment/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 grant may not be awarded.
For systems like the Kanagawa Prefecture housing subsidy, 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.
Be sure to complete the procedures set by the system (for the prefectural housing subsidy, this means obtaining grant approval) 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 awarded after a review! (The flow of procedures varies by system.)
▶ To “Subsidies and Grants That May Be Applicable in Minami Ward” within this Article
Benefits of Introducing Solar Power Equipment
The benefits of introducing solar panels are summarized in the following 5 points!
Benefit 1: Economic Benefits
The biggest advantage of introducing solar panels is the economic benefit!
While the selling price of electricity has decreased compared to 10 years ago, you can benefit by reducing the amount of electricity purchased from the utility company by consuming the generated power yourself!
As electricity costs rise, the ability to cover your consumption with solar power becomes increasingly attractive!
If you plan to use the generated power at night, installing a storage battery is essential!
For residential use (under 10kW), the selling price (FIT) 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 in the 2026 fiscal year. After the 5th year, it is generally more advantageous to use the power at home (self-consumption), making the combination with a storage battery a viable option.
👉 Ministry of Economy, Trade and Industry | For purchase prices and periods, click here
Benefit 2: You Can Utilize Subsidies!
The conditions and amounts of subsidies vary by prefecture and municipality, but if you meet the criteria, you may be able to utilize subsidies!
Reducing the actual burden through subsidies is a significant advantage!
In the case of Minami Ward, you may be eligible for the residential smart energy equipment installation subsidy from Sagamihara City or subsidies from Kanagawa Prefecture.
Benefit 3: Environmentally Friendly!
Solar power generation has low carbon dioxide emissions and reduces 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, equipment such as power conditioners may have operational noise.)
Benefit 4: Heat Insulation Effect Expected!!
By installing the panels on the roof or rooftop, they block direct sunlight from hitting the roof.
Especially in summer, it can help reduce the temperature rise of the roof, providing expected heat insulation effects!
(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 capability, you may be able to use electricity from a dedicated outlet during daytime generation.
(Note that 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 reattaching 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 request 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 brackets to the roofing material or 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 ensure proper 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 brackets, and it cannot be used with all metal roofs.)
Foundation Brackets for Horizontal Metal Roofs
Note 3: The Roof Becomes Heavier
Installing solar panels will make the roof heavier. After investigating the existing roof, substrate, and load-bearing capacity, switching to a lighter roof may 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 Roof Output
When installing solar panels on the roof, it is important to consider how much electricity can be generated in the limited area, and the more electricity generated, the better!
Solar panels come in various sizes and outputs depending on the manufacturer.
A 350W output panel and a 400W output panel may seem like 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,” resulting in different numbers of panels that can be installed on the same roof due to size differences.
400W × 15 panels = 6kW (Total roof output)
350W × 20 panels = 7kW (Total roof output)
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 calculations are for total output (kW). The actual electricity generation (kWh) will vary depending on conditions such as roof 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 reduction after long-term use varies by product. The manufacturer’s output guarantee value is a benchmark figure for warranty purposes and does not indicate the actual degradation rate or electricity generation itself.
Choosing based on initial output alone without considering the degradation rate will lead to regrets when selecting solar panels!
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.
For output warranties, some manufacturers offer a 30-year warranty while others provide a 10-year warranty, so it varies widely!
Since a longer warranty is generally better, let’s check the warranty periods and conditions of the manufacturers you are considering!
Frequently Asked Questions about Solar Power and Storage Battery Installation in Minami Ward
We have compiled frequently asked questions from customers considering the installation of solar panels and storage batteries in Minami Ward. (Tap to open the answers)
How much does it cost to install solar panels and storage batteries in Sagamihara City, Minami Ward?
The cost varies depending on the installation capacity, equipment, and roof condition. 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 by capacity are available on our solar panel installation and storage battery installation pricing page. We will create a layout diagram based on the drawings and site survey and provide a free estimate!
Are there any subsidies available for solar power and storage battery installation in Minami Ward?
As of October 6, 2026, Sagamihara City’s “Reiwa 8 Year Residential Smart Energy Equipment Subsidy” (80,000 yen for solar power, 200,000 yen for storage batteries or V2H each, etc.) has completed the first application period, and the second period is scheduled from February 1 to 26, 2027 (must arrive by this date) (lottery). The Kanagawa Prefecture subsidy (70,000 yen/kW for solar power, 150,000 yen per unit for storage batteries) is approaching the application deadline for the second period of Reiwa 8, and the national DR household storage battery project has closed its public recruitment.
Since the application status may change, please refer to the subsidy and grant section and consult with us before signing a contract.
Can I apply for subsidies even after the construction is completed?
For many programs, procedures are required before construction. The Kanagawa Prefecture subsidy requires “starting construction after the grant decision,” and if you install it beforehand, you will be excluded. On the other hand, the Sagamihara City incentive allows applications after project completion (lottery), but there are specific ranges for the application period and completion date.
The order of procedures varies by program, so please confirm before signing a contract or starting construction.
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 and suggest methods such as roof overlay (cover method) or re-roofing if deterioration is progressing.
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 within 10 to 20 years after 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 checking the condition of the roof through a site survey!
Should I install a storage battery together with the 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, Kanagawa Prefecture’s subsidy requires the simultaneous introduction of solar panels and storage batteries, and the incentive from Sagamihara City requires interconnection with the solar power generation system when targeting storage batteries or V2H. You can compare “solar only” and “solar + storage battery” in a financial simulation for consideration.
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.
In Minami Ward, there are areas like around Sagami-Ono Station where high-rise residential and commercial buildings are clustered, and the shadows cast by surrounding buildings and trees vary from house to house. You can check the expected power generation through the power generation simulation.
How long will the construction period be?
In 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.
Additionally, please note that there will be a separate period for applying for subsidies and to the power company, so please consult us early.
What is the current selling price (FIT)?
For residential use (under 10 kW), the selling price will be 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 in the 2026 fiscal year.
The idea is to recover 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-maintenance DM notifications 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.
The roof is a place that is difficult to check 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, it is possible. Kakeru Koumuten Co., Ltd. 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 consistently. 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 company in Minami Ward, please consult Kakeru Koumuten
Our company handles many exterior renovations, including solar panels, roof work, and exterior wall work in Minami Ward, Sagamihara City.
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, not only roof overlay work and re-roofing but also partial roof repairs, exterior painting, and exterior wall cover methods.
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 emergency measures without setting up scaffolding, as long as safety can be ensured, so please consult 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 optimal solutions for your specific requests.
We will never propose unnecessary work that prioritizes profit!
We always stand in the customer’s position and propose the best construction plan!
We are confident that we will not lose in terms of cost, quality, and planning compared to other companies for exterior work!
We are confident, so we welcome competitive estimates!
Estimates are completely free, and if we are found to be inferior to other companies, you are free to decline!
Characteristics of Minami Ward, Sagamihara City and Points of Solar Work
Minami Ward in Sagamihara City is located in the southeastern part of Sagamihara City. The Sagami River and Sakai River flow through the area, which features rural landscapes and parks along the rivers, while commercial facilities and high-rise residential buildings are concentrated around Sagami-Ono Station.
We have summarized the characteristics of Minami Ward and points to consider when installing solar panels and storage batteries below. (Tap to open)
View the characteristics of Minami Ward in Sagamihara City and points for solar construction
■ A ward where commercial areas, residential areas, and rural landscapes coexist
Profile of Minami Ward (Official Sagamihara City) states that Minami Ward covers an area of 38.1 square kilometers, accounting for 11.6% of the city, with the Sagami River flowing through the southwestern part and the Sakai River through the northeastern part, where rural areas extend along the rivers. Around Sagami-Ono Station, commercial and business facilities, high-rise residential buildings, and educational facilities are concentrated, with large commercial facilities along National Route 16.
The types of housing and building density vary by area. At Kakeru Koumuten, we will check the shape and orientation of the roof and the shadows cast by surrounding buildings on-site, and explain using layout diagrams and power generation simulations.
■ Check for shadows from surrounding buildings in residential areas near the station
In areas where high-rise residential buildings and commercial facilities are clustered, the times when shadows from surrounding buildings fall on the roof can affect power generation. It is reassuring to confirm the movement of shadows by season and time of day through power generation simulations.
■ Homes near green spaces and trees should be cautious of fallen leaves and dirt
The same profile mentions that Minami Ward has green spaces such as Komorebi no Mori, Kanagawa Prefectural Sagamihara Park, and Sagamihara Asamizodai Park. While areas with greenery are attractive, roofs close to trees are prone to accumulating fallen leaves and dirt, which can lead to a decrease in power generation. Kakeru Koumuten can also handle solar panel cleaning with specialized brushes and rain gutter cleaning.
■ Check the roof condition according to the age of the building
For homes that have been built for several years, it is important to check the condition of the roofing materials and substrate before installing solar panels. Depending on the condition of the roof, installing them simultaneously with roof renovations can reduce future costs for removing and reinstalling solar panels.
■ Different subsidy systems for industrial parks and business buildings along the road
The same profile states that there is a 52.3-hectare industrial park in Asamizodai. When installing in business buildings such as factories, warehouses, stores, and offices, there is a different subsidy system from that for households. Subsidies for small and medium-sized businesses in Sagamihara City are accepted until October 30, 2026, and there are conditions for eligible businesses and equipment.
■ Yokohama’s annual sunshine hours are about 2,018 hours
According to the Japan Meteorological Agency’s average values (1991-2020), Yokohama’s annual sunshine hours are about 2,018 hours (this is not the value for Minami Ward, but for observation points in the prefecture). August has the most sunshine, while June during the rainy season has the least.
Power generation varies by season, so conducting power generation simulations throughout the year and selecting the capacity of storage batteries to match peak electricity usage times are key points.
Our company is based in Kanagawa Prefecture and has handled many exterior construction and solar projects in Minami Ward, Sagamihara City.
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 sudden troubles!
Service Area in Minami Ward, Sagamihara City
Kakeru Koumuten accepts requests throughout Kanagawa Prefecture and Tokyo.
List of Areas in Minami Ward, Sagamihara City
Asahimachi, Minami Ward, Sagamihara City / Amazudai, Minami Ward, Sagamihara City / Niisono, Minami Ward, Sagamihara City / Isobe, Minami Ward, Sagamihara City / Unomori, Minami Ward, Sagamihara City / Ohnodai, Minami Ward, Sagamihara City / Kamitsuruma, Minami Ward, Sagamihara City / Kamitsuruma Honcho, Minami Ward, Sagamihara City / Kitasato, Minami Ward, Sagamihara City / Kobuchi, Minami Ward, Sagamihara City / Sakaemachi, Minami Ward, Sagamihara City / Sagami-Ono, Minami Ward, Sagamihara City / Sagamidai Danchi, Minami Ward, Sagamihara City / Sagamidai, Minami Ward, Sagamihara City / Sakuradai, Minami Ward, Sagamihara City / Shimomizo, Minami Ward, Sagamihara City / Shinto, Minami Ward, Sagamihara City / Ainan, Minami Ward, Sagamihara City / Aobudai Danchi, Minami Ward, Sagamihara City / Aobudai, Minami Ward, Sagamihara City / Toma, Minami Ward, Sagamihara City / Nishi Onuma, Minami Ward, Sagamihara City / Higashi Onuma, Minami Ward, Sagamihara City / Higashi Rinkan, Minami Ward, Sagamihara City / Futaba, Minami Ward, Sagamihara City / Bunkyo, Minami Ward, Sagamihara City / Matsugaecho, Minami Ward, Sagamihara City / Misono, Minami Ward, Sagamihara City / Minami Daisan, Minami Ward, Sagamihara City / Toyomachi, Minami Ward, Sagamihara City / Wakamatsu, Minami Ward, Sagamihara City
・Leave your exterior wall painting in Minami Ward, Sagamihara City to Kakeru Koumuten!
・Leave your roof renovation in Minami Ward, Sagamihara City to Kakeru Koumuten!
・Leave your exterior renovation in Minami Ward, Sagamihara City to Kakeru Koumuten!
・Kakeru Koumuten Co., Ltd. construction achievements
・Kakeru Koumuten Co., Ltd. after maintenance
・Kakeru Koumuten Co., Ltd. construction menu and price list
・Kakeru Koumuten Co., Ltd. staff blog and announcements
・Explaining the importance of comparison estimates and points to consider!
・Top 12 solar power generation manufacturers! Features and selection points introduced!
・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? Points for selecting installation locations introduced!
・Here is the introduction to solar power generation estimates!
We welcome consultations via LINE as well◎
We are also updating our Instagram regularly◎ Please follow us◎
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!
