Leave Your Solar Panel Installation Work in Takatsu, Kawasaki City to Kakeru Koumuten Co., Ltd.!
For solar panel and battery installation in
Takahata Ward, Kawasaki City,
trust Kakeru Koumuten!
Kakeru Koumuten is a company specializing in exterior renovations based in Kanagawa Prefecture.
As a company strong in roofing work, we are entrusted withsolar panel and battery installation considering roofs and waterproofing!
“How to Choose a Solar Panel Contractor in Takahata Ward”
“Costs for Solar Panel and Battery Installation”
“Subsidies Available for Solar System Installation in Takahata 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 you have no regrets about your solar panel installation, we recommend obtainingestimates from about three companies!
Table of Contents (tap to open/close)
- Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Takatsu Ward, Kawasaki City
- Roof Inspection Before Installing Solar Panels
- Possible Subsidies and Grants Available in Takatsu 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 Installation Contractor in Takatsu Ward, Kawasaki 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 Takatsu Ward
- If You Are Looking for a Solar Panel Installation Contractor in Takatsu Ward, Contact Kakeru Koumuten
- Characteristics of Takatsu Ward, Kawasaki City and Key Points for Solar Installation
- Service Area in Takatsu Ward, Kawasaki City
Reasons Why Kakeru Koumuten is Chosen for Solar Panel Installation in Takatsu Ward, Kawasaki City
Here are the reasons why we are entrusted with solar panel installation by customers in Takatsu Ward, Kawasaki City.
“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!
Issues 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 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 and issues after installation!
Kakeru Koumuten Co., Ltd. is strong in roofing work and can also detach and attach solar panels with its own team, allowing for quick responses to maintenance and urgent issues after solar panel installation!
2.Facilities Specialized in Exterior Renovation
Kakeru Koumuten Co., Ltd. has prepared the following warehouses and material storage areas to provide solar work and exterior renovations at low cost and high quality.
We have established five bases centered around Yokohama City, Kanagawa Prefecture for material storage and showrooms.
In-house Scaffolding Materials
To ensure safety during work on the roof, we own the necessary scaffolding materials for temporary scaffolding based on construction conditions and can assemble scaffolding ourselves.
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 if there are height differences on the site, our in-house scaffolding team will plan the scaffolding according to the local 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, enabling 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.
Showroom Dedicated to Exterior Renovations
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 roofing materials!
We can also provide simulations for potential earnings 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 keep costs down while providing high-quality roof renovations.
Additionally, one representative will handle everything from the estimate to project completion.
Since the representative does not change, whether it’s the sales or construction management, smooth communication is possible.
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 workers and painting technicians, and we are confident in our construction techniques.
We can also handle large-scale roof projects such as factories!
5. Warranty and Aftercare
In addition to the manufacturer’s warranty for solar panel installation, our own construction warranty (leakage warranty) is also included!
(The construction warranty for solar panel installation is 10 years. Depending on the condition of the roof before installation, we may not be able to provide a warranty unless roof renovations are performed. The construction warranty is separate from the manufacturer’s product warranty, and the coverage and conditions vary based on the warranty details.)
Aftercare is available annually, and we send out notification DM every year.
If you have questions about the warranty, please click on the image above!
6. Flexible and Prompt Response
Our company is equipped to handle various roofing troubles and situations.
If you cannot access the roof at high altitudes, we can utilize drones to assist!
During leak investigations, we can also conduct surveys using a thermal imaging camera.
If the power generation of solar panels decreases due to dirt, we can provide cleaning services using specialized brushes.
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 so 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 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 an estimated cumulative profit and loss over 20 to 30 years.
For customers who are not familiar with solar panel installations, we compile easy-to-understand materials that include points to consider and disadvantages!
We encourage you to obtain comparative estimates and compare them with other companies’ plans!
Roof Inspection Before Installing Solar Panels
Once solar panels are installed, they will remain on the roof for 20 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, which specializes in roofing work, has summarized the items to check before installation.
| 1. Types of Roofing Materials and Age | The fixing method varies depending on the roofing materials such as slate, tiles, metal roofs, and flat roofs (rooftop waterproofing). If the remaining lifespan of the roofing material is short, we may suggest a roof renovation first. |
| 2. Condition of 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 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 number of panels (installation capacity) that can be placed depends on the shape and size of the roof. The number of panels that can be installed varies depending on the panel size, 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 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 Routes | If there are elevation differences on the site, planning for scaffolding and the delivery routes for equipment and materials may require some ingenuity. The width of the front road and any steps on the site will also be checked during the site survey. |
Fixing Methods and Checkpoints by Roofing Material
| Roof Material | Main Fixing Method | Pre-Installation Check Points |
|---|---|---|
| Slate Roof | Varies by method (e.g., fixing brackets to the roof material and substrate with screws) | Waterproof 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 fix to the substrate) | Type and condition of tiles, substrate, load-bearing capacity. Depending on the survey results, there may be methods to replace with lightweight roofing materials before installation. |
| Metal Roof (Horizontal and Vertical) | Fixed with catch-type brackets that grip the 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 available. |
| Flat Roof / Rooftop | Fixed by installing a framework | Type and deterioration status of the waterproof layer, waterproofing around the framework. Consider in conjunction with the timing of waterproofing work. |
If you perform roof renovations 10 to 20 years after installation, there will be additional costs for removing and reinstalling solar panels. If the roof is deteriorating, it may be more cost-effective in the long run to renovate to a highly durable roofing material before installation.
Kakeru Koumuten Co., Ltd. specializes in roofing work and can also handle the removal and reinstallation of solar panels, so please consult us according to the condition of your roof!
▶ Click here for roof renovations in Takatsu Ward, Kawasaki City
Subsidies and Grants That May Be Applicable in Takatsu Ward, Kawasaki City, Kanagawa Prefecture
If you are introducing solar panels or storage batteries in Takatsu Ward, there is a possibility that the systems of “the national government,” “Kanagawa Prefecture,” and “Kawasaki City” may apply.
The following information is based on the official pages of each system as of October 6, 2026. The acceptance status may change depending on the budget, so please check the latest information before contracting or starting work.
Eligibility Conditions and Application Period for Subsidy Programs
| Program | Main Eligibility Conditions | Subsidy Amount | Application Period & Status |
|---|---|---|---|
| Kawasaki City “FY 2026 Solar Power Generation Equipment Installation Subsidy” (for individual residences) | Individuals residing (or planning to reside) in a home in Kawasaki City. Solar power systems must be 2kW or more, and the installation must be performed by a registered contractor under Kawasaki City’s “Solar Power Generation Equipment Promotion Business Registration System.” Storage batteries must be eligible products and must be connected to solar power generation equipment (2kW or more). Only purchased equipment is eligible; PPA and leasing are not eligible. | Solar Power (non-FIT): 70,000 JPY/kW (maximum 280,000 JPY per case) Solar Power (FIT applicable): 40,000 JPY per case Storage Battery: 100,000 JPY/kWh (for new solar power systems connected to non-FIT: maximum 700,000 JPY per case, FIT applicable or connected to existing equipment: maximum 300,000 JPY per case) |
April 24, 2026 – December 28, 2026 (online application, work started before grant decision is not eligible) Installation must be completed by January 31, 2027. Ends when the budget limit is reached. As of September 30, 2026, 49% of the total budget has been applied for according to the official page. |
| Kanagawa Prefecture “FY 2026 Kanagawa Prefecture Residential Solar Power Generation and Storage Battery Installation Subsidy” | Must install both solar power generation and storage systems in homes within the prefecture (homes that ensure seismic performance). Applications must be made by the individual, and construction must start after grant approval. | Solar Power: 70,000 JPY/kW Storage Battery: 150,000 JPY per unit |
Phase 1: May 11, 2026 – June 30, 2026 Phase 2: Starts September 7, 2026 (first-come, first-served) As of September 7, 2026, the application amount has reached the budget amount, and applications are now closed. Please check the prefecture’s official page for future recruitment. |
| National “DR Home Storage Battery Project” (FY 2025 Supplement) | Newly install home storage systems that can be utilized for DR (demand response) with registered products. | Calculated based on an initial effective capacity of 1kWh 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 recruitment has ended (the official site states that there are no plans to reopen applications, and currently, applications cannot be made). |
| National “Mirai Eco Housing 2026 Project” (Renovation) | Storage batteries are one of the eligible facilities, but they must be combined with essential works such as insulation renovation of windows (openings) and structures; applications cannot be made for just the installation of storage batteries. Solar panels are not included as eligible facilities. | Storage Battery: 96,000 JPY per unit | Ends when the budget limit is reached. As of October 5, 2026, the application amount for renovations is displayed as 8% of the budget on the official site. Please check the official site for application status. |
| Kawasaki City “Eco Support Subsidy for Local Businesses” | Applicable when small and medium-sized enterprises in Kawasaki City introduce systems for business facilities (joint housing is not eligible). There are conditions for eligible persons and equipment. | One-third of eligible expenses (maximum 2,000,000 JPY) If solar power generation is included, an additional 10,000 JPY per kW (maximum 200,000 JPY) will be added. |
2026 April 1 – 2027 January 12 (first-come, first-served; up to budget limit). The budget execution rate is approximately 70% as of September 29. |
| Kanagawa Prefecture “Reiwa 8 Year Kanagawa Prefecture Self-Consumption Type Renewable Energy Introduction Subsidy” | Corporations and individual business owners filing blue returns (individual residences are not eligible). For solar power, a generation output of 10kW or more, facilities for business use, equipment not certified under FIT/FIP, etc. | Solar power: 80,000 JPY/kW, etc. Storage systems: 50,000 JPY/kWh (maximum 5,000,000 JPY) |
Application period ended on September 3, 2026 (when the application amount reached the budget amount) |
Subsidies for residential properties in Kawasaki City and Kanagawa Prefecture require not only the acceptance of applications but also construction to commence after receiving “grant approval”. If construction begins beforehand, it will be ineligible. The prefecture’s residential subsidies are granted after a performance report and review following the completion of construction. The order of procedures varies by system, and applying does not guarantee a grant, so please confirm before contracting or starting construction.
Kakeru Koumuten will provide guidance on eligibility conditions and business requirements for each system after confirming them.
National Subsidy “DR Home Storage Battery Project (Support Project for the Introduction of Home Storage Systems for DR Resources)”
The national government has been implementing the “DR Home Storage Battery Project” to support the installation of home storage batteries.
Those introducing new registered products of storage systems that can be utilized for demand response (DR) are eligible. 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 3/10 and a maximum of 600,000 JPY per application. There are also conditions such as being ineligible for items contracted or ordered before grant approval.
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.
Furthermore, there are currently no subsidies confirmed for the installation of solar panels on existing homes.
👉 Here is the official site for 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” to their residences.
The subsidy details are 70,000 JPY per 1kW of solar power generation and 150,000 JPY per storage system.
For example, if introducing 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 is made, it will be excluded from eligibility. The application must be made by the individual (proxy applications by contractors are not allowed), among other conditions. It is stated on the official page of Kawasaki City that this can be combined with the city’s subsidies.
For the fiscal year 2026, the first phase (May 11 – June 30) and the second phase (starting September 7, first-come-first-served) were accepted, and the second phase has closed as of September 7, 2026, when the application amount reached the budget amount. For future recruitment, please check the official page of Kanagawa Prefecture.
👉 Here is the official page of Kanagawa Prefecture
Kanagawa Prefecture “Fiscal Year 2026 Kanagawa Prefecture Subsidy for Introducing Self-Consumption Renewable Energy” (for businesses)
Kanagawa Prefecture is also implementing subsidies for businesses that introduce “self-consumption” facilities that use electricity generated by solar panels.
Eligible applicants are corporations or individual business owners who file blue returns, and the introduction to individual residences is not eligible.
Solar power generation must have an output of 10 kW or more and supply electricity to business facilities within the prefecture, and it must be equipment that does not receive FIT or FIP certification.
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).
The application amount reached the budget amount for fiscal year 2026, so recruitment was closed on September 3, 2026.
Businesses considering the installation of solar panels on commercial buildings in Takatsu Ward should check the official page of Kanagawa Prefecture for the next recruitment.
👉 Click here for details
Kawasaki City “Eco Support Subsidy for Local Businesses” (for businesses)
Kawasaki City is implementing a system to subsidize part of the introduction costs of renewable energy facilities, etc. for small and medium-sized enterprises in the city.
The target is business facilities, and apartment buildings are not eligible. For households, the “Subsidy for Installing Solar Power Generation Equipment” below will be the point of contact. Businesses installing solar panels on stores, offices, factories, etc. in Takatsu Ward may have the possibility to utilize this, but it is necessary to confirm the eligibility and equipment conditions.
The subsidy amount is 1/3 of the eligible expenses (with a maximum of 2 million yen), and if solar power generation is included, an additional 10,000 yen per kW (with a maximum of 200,000 yen) will be added.
The application period for fiscal year 2026 is from April 1, 2026, to January 12, 2027, and if the budget limit is reached, recruitment will end in order of application. The budget execution rate was announced to be about 70% as of September 29, so early confirmation is recommended.
For detailed conditions and application methods, please check the official page of Kawasaki City.
👉 Here is the official page of Kawasaki City
Kawasaki City “Reiwa 8 Fiscal Year Solar Power Generation Equipment Installation Subsidy” (for individual residences)
Kawasaki City is implementing the “Solar Power Generation Equipment Installation Subsidy” for individuals who install solar power generation equipment and storage batteries in residential properties within the city. Residents of Takatsu Ward are also eligible.
◎Subsidy Amount◎
●Solar Power Generation (Non-FIT): 70,000 JPY/kW (maximum 280,000 JPY per case)
●Solar Power Generation (FIT applicable): 40,000 JPY per case
●Storage Battery: 100,000 JPY/kWh (if connecting to new solar power that is non-FIT, maximum 700,000 JPY per case; if connecting to FIT applicable or existing equipment, maximum 300,000 JPY per case)
●ZEH/ZEH Oriented: 250,000 JPY per unit, ZEH+: 400,000 JPY per unit
The main conditions are that the solar power must be 2kW or more and installed by a registered business under Kawasaki City’s “Solar Power Generation Equipment Promotion Business Registration System,” the storage battery must be a qualifying product that connects to the solar power generation equipment (2kW or more), and it must be purchased equipment (PPA and leasing are not eligible). Applications are accepted online only, and starting work before receiving the grant decision notification will make you ineligible for the subsidy.
The application period for Reiwa 8 is from April 24, 2026, to December 28, 2026, with installation completion by January 31, 2027. The program will end once the budget limit is reached, and as of September 30, 2026, 49% of the total has been applied for, according to the official page. It is stated that this can be combined with other subsidies from the national government and Kanagawa Prefecture.
For detailed conditions and application methods, please check the official Kawasaki City page.
👉 Click here for the official Kawasaki City page
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 (kilowatt). Storage batteries are compared in terms of 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 depending on the shape, orientation, and size of the roof. At Kakeru Koumuten, we create layout diagrams from blueprints and on-site surveys to present the installation capacity.
On our pricing page, we list solar panels 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 may 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 by only looking at the amounts. Please check if the following items are clearly stated in each company’s estimate!
| 1. Solar Panels | Manufacturer, model number, output per panel (W), number of panels, total installation capacity (kW) should be listed. |
| 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 of use during power outages (entire house or specific circuits), installation location. |
| 4. Mounting Frame and Hardware | Name of the hardware suitable for the roofing material and the method of securing it (whether it involves drilling holes or clamping). |
| 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 the fixed parts, whether necessary roof repairs and substrate reinforcements are included. |
| 7. Application | Extent of support for applications to the power company, certification application for selling electricity (FIT), and subsidy applications. |
| 8. Scaffolding | Scope and quantity of scaffolding. If 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 prices are tax-inclusive or tax-exclusive, conditions under which additional costs may arise, details and duration of manufacturer warranty and workmanship warranty. |
If the capacity differs, both the price and power generation will change. Kakeru Koumuten Co., Ltd. warmly welcomes competitive estimates, so if you bring estimates from other companies, we will explain the differences item by item!
Self-Estimate and Profit Simulation for Solar Power Generation
With the simulator above,
you can get 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 using catch type hardware gripping the horizontal metal roof (Catch Method) |
| Price Range |
| 2,200,000 JPY – 2,300,000 JPY *Due to the grant being provided, the actual burden amount is approximately 1,000,000 JPY Estimated recovery period for construction costs: about 8 to 9 years (self-consumption) *The grant amount and recovery estimate are based on the system and calculations at the time of construction, and may differ under the current system. |
| Construction Period |
| 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 will be provided. |
Our Proposal
We visited to provide an estimate and created a layout diagram for the solar panels from the drawings!
The layout diagram shows the arrangement of the 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 Takatsu Ward, Kawasaki City
There are many solar panel installation contractors available in Takatsu Ward, Kawasaki City, and you may be unsure which contractor to choose.
Therefore, when requesting solar panel installation and battery storage installation work, let’s confirm the following 4 points.
● 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.
Have knowledge not only about solar panels but also about roofs
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 deteriorated roof, resulting in leaks
・Solar panels were installed on a roof with a short lifespan, necessitating a remodel to detach the solar panels within a few years
・Misjudgment of the type of waterproofing led to incorrect treatment and subsequent 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 is important to check not only the duration of the warranty but also the coverage, exclusions, and cost conditions.
Solar panels and battery storage units come with manufacturer warranties, but also confirm whether there is a workmanship warranty in case leaks occur after installation!
For contractors that offer a workmanship warranty, if leaks occur after installation within the warranty period and conditions, they may cover the repairs under the warranty.
Additionally, some contractors provide after-sales services separate from warranties, so make sure to check if the contractor you are considering has after-sales service.
Since abnormalities or damages on the roof may be in hidden areas, you might not notice them yourself.
By conducting inspections of hidden areas during after-sales maintenance, you can more easily detect abnormalities early and prevent major repairs or failures!
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 without performing roof renovations.)
We also conduct aftercare maintenance and send out annual DM!
After checking the DM, if you wish, we will visit 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-services may differ.
Additionally, obtaining multiple estimates makes it easier to negotiate prices.
To request your preferred contractor at a lower price, we recommend obtaining estimates from multiple contractors.
When comparing estimates, please check:
“Verification of estimate items”
“Types of solar panels”
“Warranties and after-services”
and make a detailed comparison for your judgment! Avoid judging solely based on cost, as using lower-grade materials or skipping processes can reduce costs!
▶ 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 contractors cannot apply on behalf of clients and personal applications are required, 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 construction!
For the prefectural housing subsidy, after the completion of construction, a performance report must be submitted, and the grant will be provided after review! (The flow of procedures varies by system)
▶ Go to “Subsidies and grants that may be applicable in Takatsu Ward” in this article
Benefits of Introducing Solar Equipment
The benefits of installing solar panels are as follows!
Benefit 1: Economic Benefits
The biggest advantage of introducing solar panels is the economic benefit!
The selling price of electricity has decreased compared to 10 years ago, but by consuming the generated electricity, 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 want to use the generated electricity at night, installing a storage battery is essential!
Furthermore, the selling price (FIT) for residential use (under 10kW) will be set at “24 yen/kWh for the first 4 years, and 8.3 yen/kWh from the 5th to the 10th year” for certifications after October 2025, and the same price will apply for the 2026 fiscal year. After the 5th year, it is likely to be more advantageous to use it at home (self-consume) rather than selling it, making the combination with a storage battery a viable option.
👉 Ministry of the Environment and Energy | For purchase prices and periods, click here
Advantage 2 Subsidies can be utilized!
The conditions and amounts of subsidies vary by prefecture and municipality, but if you meet the conditions, you may be able to utilize subsidies!
Reducing the actual burden amount through subsidies is a significant advantage!
In Takatsu Ward, there is a possibility of being eligible for subsidies from Kawasaki City and Kanagawa Prefecture.
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 on the roof or rooftop, the panels block direct sunlight to the roof.
Especially in summer, it can help reduce the roof temperature, providing expected heat insulation effects!
（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 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 functionality, you may be able to use electricity from a dedicated outlet during daytime generation.
（The devices, output, and duration that can be used during a power outage vary depending on the model and wiring method）
What points should be noted when introducing solar power generation?
Next, we will explain the “three points to note” when installing solar panels!
Point 1 Maintenance costs can be incurred
A particularly overlooked maintenance cost is for the roof where solar panels are installed.
If you perform roof renovation 10 to 20 years later, there will be costs for removing and reattaching the solar panels.
If the existing roof is deteriorated, it is reassuring to renovate it with durable roofing materials before installing the solar panels!
Additionally, there will be costs for regular inspections of the equipment, repairs or replacements of the power conditioner, and updates due to the deterioration of the storage battery.
It would be reassuring to consider maintenance costs in simulations before introducing solar panels!
Point 2 The risk of leaks may increase depending on the roofing material
The fixing methods for slate roofs and tile roofs vary by construction method, but in methods that fix hardware with screws to the roofing material or substrate, 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 hardware for horizontal metal roofs
Note 3: The roof will become heavier
As solar panels are installed, the roof will become heavier. After investigating the existing roof, substrate, and load 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!
Choosing Method 1: Compare by Total Output of the Roof
When installing solar panels on the roof, it is important to know how much power can be generated in a limited area, and generating more power is always better!
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 on the roof, “20 panels of 350W can be installed, while only 15 panels of 400W can be installed,” meaning the number of panels that can be installed may differ even 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 power generation (kWh) will vary depending on conditions such as roof orientation, slope, and shading.
Choosing Method 2: Compare by Degradation Rate of Solar Panels
Solar panels have a degradation rate, and their output gradually decreases over 10 or 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 power generation itself.
Choosing solar panels while considering the degradation rate, rather than just the initial output, will lead to a regret-free selection!
Choosing Method 3: Compare by 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 Takatsu Ward
We have compiled frequently asked questions from customers considering the installation of solar panels and storage batteries in Takatsu Ward. (Tap to open the answers)
How much does it cost to install solar panels and storage batteries in Takatsu Ward, Kawasaki City?
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 guidelines based on 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 power and storage battery installation in Takatsu Ward?
As of October 6, 2026, the subsidies from Kawasaki City (solar power: 70,000 yen/kW for non-FIT applications, up to 280,000 yen; 40,000 yen per case for FIT applications; storage battery: 100,000 yen/kWh) are currently in the application period (ending as soon as the budget limit is reached). The Kanagawa Prefecture subsidy (70,000 yen/kW for solar power; 150,000 yen per unit for storage batteries) reached its budget limit on September 7 for the second phase of Reiwa 8, and the national DR home storage battery program has ended its public recruitment.
Since the acceptance status may change, please check the subsidy and grant section and consult with us before signing a contract.
Can I apply for subsidies after the construction is completed?
For many programs, procedures are required before construction. The subsidies from Kawasaki City and Kanagawa Prefecture require “commencement of construction after grant decision,” and if you start construction beforehand, you will be excluded from eligibility.
The order of procedures varies by program, so please confirm before signing a contract or starting construction.
Can solar panels be installed on a slate roof? I’m worried about leaks.
It is possible to install on a slate roof, but it is necessary to check the condition of the roofing material and substrate beforehand. The fixing method varies by construction method, and when fixing brackets to the roofing material or substrate, waterproofing treatment of the fixed parts is essential.
Kakeru Koumuten is a specialist in exterior renovations with strong expertise in roofing work, so we will check the condition of the roof before installation and suggest methods such as roof overlay (cover method) or replacement 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 after 10 to 20 years of installation, the cost for removing and reinstalling solar panels will be incurred separately. 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?
For those who want to use 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 beneficial to use it at home rather than selling it.
Additionally, Kanagawa Prefecture’s subsidy requires the simultaneous introduction of solar panels and storage batteries, and the subsidy in Kawasaki City also requires that the storage battery be connected to solar power generation equipment (2kW or more). You can compare “solar only” and “solar + storage battery” through a financial simulation.
How many kW can be installed on my roof? Is it okay for north-facing roofs or roofs with shadows?
The capacity that can be installed varies depending on the shape, orientation, and size of the roof. At Kakeru Koumuten, we create a layout diagram from the drawings and site survey, and provide you with the installation capacity and power generation simulation.
In Takatsu Ward, there are areas close to hilly terrain and sloped green spaces, so the impact of surrounding elevation differences and shadows from trees will vary for each house. You can check the expected power generation through the power generation simulation.
How long does the construction period take?
In the above construction example (solar panels 4.3kW + storage battery), it took about 3 days. The duration may vary if roof work is done simultaneously or depending on the shape of the roof and installation capacity.
Please note that additional time is required for applications for subsidies and power companies, so please consult us as soon as possible.
What is the current selling price (FIT)?
For residential use (under 10kW), 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, with the same price applied for the 2026 fiscal year.
The idea is to recover initial costs more quickly in the first 4 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 dedicated 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 handle renovations for roofs that already have solar panels installed?
Yes, we can. Kakeru Koumuten can remove and reinstall 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 removal and water heater removal pricing page.
If you are looking for a solar panel installation company in Takatsu Ward, please consult Kakeru Koumuten
Our company handles a wide range of exterior renovations, including solar panels, roofing work, and exterior wall work in Takatsu Ward, Kawasaki City.
We have received requests from many customers, including renovation companies and real estate agencies!
Kakeru Koumuten promises “high-quality renovations at low costs”, and we have received positive 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, including roof overlay work, roof replacement work, partial roof repairs, exterior painting, and exterior cover methods, all with our own team.
We are also happy to assist with small jobs like partial repairs and rain gutter cleaning!
In urgent cases such as leak repairs, we may be able to provide temporary measures without setting up scaffolding, as long as safety can be ensured, so please consult with us!
“I want to know about recommended solar panels“, “I want to keep costs as low 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 our customers’ shoes and propose the best construction plans!
We are confident that we will not be outdone in terms of cost, quality, and planning for exterior work compared to other companies!
We welcome competitive quotes because we are confident!
Estimates are completely free, and if we are found to be inferior to other companies, feel free to decline!
Characteristics of Takatsu Ward, Kawasaki City and Points for Solar Work
Takatsu Ward, Kawasaki City is located almost in the center of the elongated Kawasaki City, blessed with the greenery of the Tama Hills and the waterside of the Tama River. We have summarized the terrain and housing conditions of Takatsu Ward, as well as points to be careful of when installing solar panels and storage batteries below. (Tap to open)
View the characteristics of Takatsu Ward, Kawasaki City and points for solar work
■ The undulating terrain makes it important to check for shadows and scaffolding and transportation routes
Takatsu Ward is described as having undulating terrain, which can be broadly categorized into three types: flat land formed by the Tama River and the Nikaryo Waterway, hilly land that is part of the Tama Hills, and sloped green spaces along the cliffs of the Tama River.
In sites close to hilly areas or slopes, the way shadows are cast by surrounding height differences and trees varies from house to house. Additionally, if there are height differences on the site, it may be necessary to devise plans for scaffolding and transportation routes for equipment and materials. Kakeru Koumuten responds to site conditions with our own scaffolding team and owned scaffolding materials, creating layout diagrams based on drawings and site conditions, which can be confirmed through power generation simulations.
■ Areas with abundant greenery should be cautious of reduced power generation due to fallen leaves and dirt
Takatsu Ward is blessed with the greenery of the Tama Hills and the riverside of the Tama River. Roofs close to trees are prone to accumulating fallen leaves, dust, and bird droppings, which can lead to reduced power generation and clogged rain gutters. Kakeru Koumuten Co., Ltd. offers specialized cleaning of solar panels with dedicated brushes, as well as rain gutter cleaning services.
■ In flat areas near the Tama River and the Nikagiryō Waterway, check the placement of storage batteries
In flat areas formed by the Tama River and the Nikagiryō Waterway, it is important to plan by checking the surrounding environment for the installation of equipment such as storage batteries, distribution boards, and power conditioners (e.g., whether water tends to accumulate in the area). Please consult us about the installation location after checking the information about your area on hazard maps. If you want to use electricity during power outages, consider installing a storage battery.
■ From ancient highways to new residential areas, check each roof individually
Takatsu Ward flourished as a post town centered around the Futako ferry and the Ōyama Highway during the Edo period, and the type and age of roofs vary depending on the period of development and the buildings. Kakeru Koumuten Co., Ltd. will check the type and condition of the roof before installation and propose methods for securing and waterproofing.
■ 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. Monthly, August (about 206 hours) has the most, while June during the rainy season (about 136 hours) has the least.
Power generation varies by season, so conducting annual power generation simulations and selecting the capacity of storage batteries according to peak electricity usage times is key.
Our company is based in Kanagawa Prefecture and has extensive experience in exterior construction and solar work in Takatsu Ward, Kawasaki City.
We are happy to handle 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 Takatsu Ward, Kawasaki City
Kakeru Koumuten Co., Ltd. accepts requests throughout Kanagawa Prefecture and Tokyo.
List of Areas in Takatsu Ward, Kawasaki City
Amezu, Takatsu Ward / Unanene, Takatsu Ward / Kajigaya, Takatsu Ward / Kanigaya, Takatsu Ward / Kamisakunobe, Takatsu Ward / Kitano River, Takatsu Ward / Kitamikata, Takatsu Ward / Kuji, Takatsu Ward / Sakado, Takatsu Ward / Shomoguchi, Takatsu Ward / Shomoguchi Fujimidai, Takatsu Ward / Shimosakunobe, Takatsu Ward / Shimono, Takatsu Ward / Shinsaku, Takatsu Ward / Suenaga, Takatsu Ward / Suwa, Takatsu Ward / Seta, Takatsu Ward / Chitose, Takatsu Ward / Chitose Shinmachi, Takatsu Ward / Higashinogawa, Takatsu Ward / Kusue, Takatsu Ward / Kusumoto, Takatsu Ward / Futako, Takatsu Ward / Mizoguchi, Takatsu Ward / Mukogaoka, Takatsu Ward
・Trust Kakeru Koumuten for exterior wall painting in Takatsu Ward, Kawasaki City!
・Trust Kakeru Koumuten for roof renovations in Takatsu Ward, Kawasaki City!
・Trust Kakeru Koumuten for exterior renovations in Takatsu Ward, Kawasaki City!
・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 comparison estimates and key points!
・12 major manufacturers of solar power generation! 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? Key points for site selection introduced!
・Here is the introduction to solar power generation 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!
