What are the installation costs for solar power generation? A thorough explanation of tips to reduce costs!

In recent times, the rising electricity costs have become a significant concern, leading to increased attention on solar power, a form of renewable energy. By installing solar power systems, you can enjoy various benefits, including reduced electricity bills.

However, the installation of solar power systems can be expensive, which may cause some people to hesitate. Therefore, this time, we will provide a detailed explanation of the estimated installation costs for solar power systems and tips on how to reduce these costs.

Estimated Installation Costs for Solar Power Systems

Solar power systems are sold based on the price per kW.

According to the “Opinion on Procurement Prices and Other Matters for Fiscal Year 2025” published by the Ministry of Economy, Trade and Industry, the selling price per kW was set at 267,000 yen (average for new and existing buildings).

For typical residential solar panels, a capacity of 3 to 5 kW is generally sufficient, so considering the above data, the market price can be estimated to be around 801,000 to 1,335,000 yen.

However, these figures are merely estimates (market prices), and actual costs may vary depending on the manufacturer and the specifics of the installation, so please check with the manufacturer or our company for more details!

Necessary Equipment and Cost Breakdown for Solar Power Systems

To install solar power systems, various equipment is required, each incurring its own costs.

Let’s take a closer look at the typical equipment and their cost breakdown.

Solar Panels

Solar panels are flat solar cells.

They are also referred to as “solar power panels” or “solar cell modules.”

Solar panels are the most critical component of solar power systems, accounting for approximately 47% of the total installation cost.

Power Conditioner

A power conditioner is the equipment that converts the direct current electricity generated by the solar panels into alternating current electricity. Without this equipment, the solar power system cannot function, making it the second most important component after the solar panels.

The power conditioner needs to increase its output according to the capacity of the solar panels, and the larger the capacity, the higher the cost.

The cost breakdown is about 5% of the total.

Mounting Frame

When installing solar panels, they must be secured in place. This is done using a mounting frame.

The mounting frame not only secures the panels but also adjusts their height and angle. The more panels there are, the higher the cost associated with the mounting frame.

The cost breakdown is about 2.8% of the total.

Other Equipment

If you choose to install additional equipment such as monitors or storage batteries when setting up solar power systems, the costs can vary significantly. Installing a monitor to check the power generation, sales conditions, and electricity usage may incur additional costs of several tens of thousands of yen.

Storage batteries, which are used to store generated electricity, tend to be relatively expensive, often costing over 100,000 yen including installation fees.

Installation Costs

When installing solar power systems, you will incur not only equipment costs but also installation costs. The installation costs can vary significantly depending on the contractor you choose, but the market price is generally around 210,000 to 400,000 yen.

However, costs may fluctuate based on the shape and method of the roof, so we recommend obtaining a quote for confirmation.

Costs After Installing Solar Power Systems

Many people considering the installation of solar power systems focus on the initial costs, but it is also important to consider the running costs after installation.

Below, we introduce the main expenses that will arise after installation.

Maintenance Costs

When installing solar power systems, regular maintenance is required.

Basically, solar power systems do not have moving parts, so there is no need for frequent large-scale maintenance, but

・Equipment inspections
・Minor repairs and renovations
・Cleaning
・Weeding (if installed on the ground)

and other tasks will occur.

Maintenance of solar power systems is generally not something you can do yourself, so you will need to hire a professional service.

In that case, the cost will be several tens of thousands of yen per visit, so be sure to include it in your budget.

Removal Costs

Since solar power systems are intended for long-term use, the need for removal is very rare.

However, if you are doing renovations or replacing panels due to aging, you will need to remove the existing panels first.

Removal of solar power systems cannot be done by yourself, so you will need to hire a professional service. The cost varies by contractor, but it is often estimated in the hundreds of thousands of yen.

Factors Affecting the Installation Costs of Solar Power Systems

The factors that cause fluctuations in the installation costs of solar power systems are mainly the following four.

・System capacity
・Manufacturer
・Roof shape, material, and type
・Contractor

Let’s take a closer look at each of these factors.

System Capacity

The larger the capacity of the panels, the higher the cost will be.

Increasing the capacity will increase the power generation, which can lead to increased income from selling electricity and increased storage capacity, but the initial costs will also be higher, so careful consideration of cost-effectiveness is necessary.

If you are unsure of the optimal capacity, consult with a contractor to make your decision.

Manufacturer

The costs of solar panels and other equipment can vary significantly by manufacturer. Domestic manufacturers tend to have high performance and robust support, but their costs are also higher. While overseas products can be more cost-effective, they may have lower reliability, warranty, and quality compared to Japanese products, so it is important to check in advance.

Roof Shape, Material, and Type

In the case of single-family homes, it is common to install solar power systems on the roof of your home.

Generally, they can be installed on any type of roof, but depending on the shape, material, and type, the labor involved in the installation may increase, leading to higher costs. In particular, for complex roofs such as those with traditional tiles, there is a higher likelihood of incurring additional costs.

Contractor

Even for the same equipment, the costs can vary depending on the contractor you hire for the installation work. There are contractors across the country that handle solar power system installations, and their scales vary widely, but the installation costs can differ significantly depending on the contractor you choose, so be sure to request estimates from multiple contractors.

Some contractors may offer prices that are far below the market average. However, there is always a reason for low prices, so it is advisable to pay attention to aspects other than cost and make a comprehensive judgment.

Factors That Increase the Installation Costs of Solar Power Systems

The factors that increase the installation costs of solar power systems are as follows.

・The roof has a special shape
・Scaffolding installation is necessary
・Differences due to construction methods

The roof has a special shape

Complex roofs with intricate shapes or multiple surfaces increase the difficulty of installation work, which in turn raises the labor costs, making expenses more likely to be high.

Additionally, steep roofs may also require extra costs for safety measures due to the increased difficulty of work. Furthermore, if the roof is severely deteriorated and requires repairs, it must be fixed before installation.

In this case, please be aware that separate repair costs will apply.

Scaffolding installation is necessary

If scaffolding is required for the installation of solar power systems, additional scaffolding fees will be incurred. The costs vary depending on the number of surfaces and the contractor, but for general residential properties, the typical cost ranges from 100,000 to 150,000 yen. In cases of three-story buildings or narrow sites where assembly takes more labor, the costs may increase further, so it is advisable to obtain an estimate in advance.

What are the differences in solar power installation methods?

～Explaining three methods of installation on roofs and their characteristics～

When introducing solar power, not only is it important to consider “which panels to choose,” but also “how to install them on the roof” is a very crucial point. In fact, there are several methods for installing solar panels on roofs, and differences arise in costs, construction content, and leak risks, so it is essential to understand the characteristics in advance.

Here, we will clearly introduce the advantages and disadvantages of three representative installation methods for residential use.

① Anchor Method (Standard and Cost-Effective)

This method involves drilling holes in the roof and securing brackets with screws.

It is easy to keep costs down and is the most commonly adopted method.

Characteristics:

• The most affordable (low introduction cost)

• Compatible with most roofing materials

• Components are generic and construction time is short

Points to note:

To create holes in the roof, if the waterproofing treatment is insufficient, there is a risk of leakage.

• If the panels need to be replaced before the roof’s lifespan is over, reconstruction will be necessary.

② Catch Method (Fixing by grasping the roofing material)

This method involves installing dedicated support brackets on the existing roofing material and placing a frame and panels on top.

Compared to the anchor method, it is somewhat more expensive, but it is characterized by reduced burden on the roof.
This method can only be applied to metal roofs.

Features:

• Can be installed without making holes in the roofing material.

• Low risk of leakage.

• Some contractors may offer leakage guarantees.

Cautions:

• The brackets and materials are specialized and somewhat expensive.

• Compatible roofing materials are limited (only metal roofs).

③ Support Tile Method (Replacing with dedicated tiles to install panels)

This method involves removing existing tiles and replacing them with “dedicated tiles for solar panel support.”

Since it results in a natural finish that integrates with the roof, it is popular among those who prioritize aesthetics.

Features:

• The appearance is clean and natural (there is a sense of unity with the roofing material).

• Low risk of leaks

• Easier to enhance the overall asset value of the building

Points to consider:

• Specialized materials and processing are required, and the initial cost is higher

• Construction period tends to be longer

• Installation may not be possible if the roofing material is not compatible

Which method is best? Choose based on cost and peace of mind

“I want to implement it as cheaply as possible”

“I’m really worried about leaks”

“I want to pay attention to the appearance as well”

It is important to choose the optimal method according to these requests.

Tips for Reducing the Installation Cost of Solar Power Generation

Here are some tips for reducing the installation cost of solar power generation:

・Utilize subsidies
・Optimize system capacity and panel types
・Find a reliable contractor

Let’s take a closer look at each of these.

Utilize subsidies

For the installation of solar power generation and storage batteries, there may be subsidy programs provided by the national or local government that you can take advantage of. Utilizing such programs can reduce your financial burden, making it easier to proceed with the installation. However, the availability and conditions of subsidies vary by municipality, so be sure to check in advance for any that may be applicable.

ZEH Subsidy

Requirements

・The house must meet the ZEH standards for new or existing homes.
・It must clear the enhanced exterior performance standards (insulation performance).
・Renewable energy (such as solar power generation) must be introduced.
・Primary energy consumption must be reduced by 20% or more from the standard (including energy creation, a reduction of 100% or more).
・The design and construction must be carried out by a registered ZEH builder/planner.

Subsidies

・ZEH homes: 550,000 yen per unit
・Storage systems (optional): 20,000 yen/kWh (up to 200,000 yen)
・ZEH+ (higher performance): up to 1,000,000 yen
・LCCM homes: up to 1,400,000 yen

Optimize system capacity and panel types

The installation cost of solar power generation can vary significantly based on capacity and panel types.

Increasing capacity will increase power generation, and installing higher-performance panels will improve generation efficiency, but this may also increase the financial burden. Therefore, it is important to choose options that fit your budget.

Find a reliable contractor

If you want to keep the installation cost of solar power generation low, it is essential to carefully select the installation contractor.

Even with the same products, the costs can vary depending on the contractor you choose.

Additionally, the service content and aftercare may also differ, so be sure to obtain estimates from multiple companies and take your time to find a contractor that fits your budget and needs.

Can the installation cost of solar power generation be recovered through selling electricity?

Some of you considering the installation of solar power may be looking forward to income from selling electricity.

Indeed, for the first 10 years after installing solar power, you can sell electricity at a fixed price. (FIT system)

However, realistically speaking, it is difficult to earn significant profits from selling electricity, so it is advisable to avoid installations aimed solely at generating income.

For those considering solar installation in Kanagawa Prefecture

Kakeru Koumuten Co., Ltd. provides total support from roof condition assessments to power generation simulations and subsidy consultations!

Please feel free to consult with us!

【▶ Click here for free diagnosis and consultation】

About the costs of installing solar panels and storage batteries

This serves as a guideline for the costs when installing solar panels and storage batteries!

The estimate for solar panel installation will be determined based on the following items:
・Installation capacity of solar panels (number of panels)
・Installation capacity of storage batteries (three patterns: 5kW, 10kW, 15kW)
・Length of wiring used
・Area for temporary scaffolding installation
・Type of existing roofing material (the type of base brackets used varies depending on the roofing material)
・Arrangement of solar panels (the amount of brackets used varies depending on the arrangement)
・Distance for material transportation
and more

Installation Capacity	Cost of Solar Panel Installation	Battery Installation
3kW～5kW	800,000 yen～1,200,000 yen	1,000,000 yen～1,300,000 yen (5kW range)
6kW～10kW	1,200,000 yen～1,900,000 yen	1,300,000 yen～1,600,000 yen (10kW range)
11kW～15kW	1,900,000 yen～2,500,000 yen	1,700,000 yen～2,000,000 yen (15kW range)

The above table provides approximate costs!
For a detailed estimate, please feel free to contact us as it is completely free.

If you are considering the installation of solar panels, please consult Kakeru Koumuten Co., Ltd.

Our company handles a wide range of exterior renovations, including solar panel installation, roof work, and exterior wall work. We receive requests from many customers, including renovation companies and real estate agencies!

Kakeru Koumuten Co., Ltd. promises “high-quality renovations at low costs”, 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 roof replacement but also partial roof repairs, exterior wall 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 also be able to provide emergency measures without scaffolding, so please consult us!

Whether you want to know about recommended solar panels, keep costs down, or just get an estimate, we will provide the best solutions for your specific requests. We will never propose unnecessary work that prioritizes profit! We always stand in our customers’ shoes and propose the optimal construction plan!

We are confident that we will not be outdone by other companies in terms of cost, quality, and efficiency in exterior work!
We are confident, so we welcome competitive estimates!Our estimates are completely free, and if you find our company lacking compared to others, feel free to decline!

Conclusion

The installation of solar power generation generally costs between 800,000 yen and 1,400,000 yen, and in some cases may exceed that amount.

Additionally, it is important to take your time to prepare thoroughly, as you need to consider not only the initial costs but also maintenance costs and future removal costs.

To install solar power generation within your budget, it is essential to utilize subsidies and choose the right capacity and panels that fit your budget, but even more importantly, “choosing the right contractor” becomes crucial.

That said, there are several contractors nationwide that can handle the installation of solar power generation, so it can be confusing to know where to consult.

In such cases, please consult with Kakeru Koumuten Co., Ltd., which has extensive experience in solar power installation.

Our skilled staff will listen to your budget and needs and provide you with the best proposals.

Free estimates and consultations are also very welcome, so please feel free to contact us!

For more helpful information on other exterior renovations, click here!

LINE consultations are also very welcome◎

For roofing, guttering, and exterior work and repairs in Kanagawa, contact Kakerukoumuten Co., Ltd..

AAA is a young company with an average age in the early 20s, but our technology is second to none.

One of our greatest strengths is that we can do all of our own scaffolding, roofing, and painting work. In this industry, where work is generally divided, we are able to provide a complete set of services, which saves time and effort in management and reduces costs. Above all, if there is any trouble, we will come to you right away!

We can confidently declare this. We are the youngest and most friendly renovator in Kanagawa!