Measure first
then install
Honest estimates
honest quotes
Findings in writing
before any quote
Solar energy for homes and businesses
Solar Brook Valley surveys roofs, plans rooftop photovoltaic systems and home batteries, and helps with the grid-connection paperwork. Our office is in Marugame, Kagawa; whether we can take on a project elsewhere is something we confirm by email, case by case.
We look at the roof first and the numbers second.
Solar Brook Valley is a small solar business for houses and small commercial buildings. We survey the roof, plan the system, and help with the grid-connection and FIT paperwork that comes with it. This page describes how we work rather than telling a company legend, because what you need before a roof project is a clear process, not a biography.
Every enquiry starts the same way: you tell us about the building, and we read it before we answer. If the roof is shaded, too small, in poor condition or simply a poor fit, we say so plainly instead of selling a system anyway. Quotes are written individually after a survey, because roof area, orientation, shading and the existing electrical setup all change the scope of the work.
Our office is in Marugame, Kagawa. We do not publish a service area on this site: if your property is elsewhere in Japan, write to us and we will tell you by email whether a visit and an installation are practical. Which electrical contractor carries out the wiring, and which registrations that contractor holds, is stated in the written quote, and we would like you to ask for those details before you sign.
Every project is quoted individually after a site survey, because roof area, shading, panel orientation and your existing electrical setup all affect the scope. These are the categories we can quote for.
4-21-16 Otemachi, Marugame, Kagawa 763-0034, Japan
Mon-Fri 9:00-18:00, Sat 10:00-15:00
Office hours
Mon-Fri 9:00-18:00, Sat 10:00-15:00
How we approach a project
We visit the property before quoting. Roof pitch, shading from neighbouring buildings and the existing electrical panel all affect what a system can realistically produce.02Residential solar system (7-10 kW)Home battery retrofitPaperwork support
We help you prepare the grid-connection application and the FIT registration papers. You stay the applicant, and each quote says which steps we take care of.03Home battery retrofitHonest estimates
Output figures are estimates built from your roof and location, with their assumptions written down. If a roof is not well suited, we say so rather than oversell.04Monitoring and upkeep
Whether a monitoring unit is part of the system, and how output is checked afterwards, is agreed in the quote instead of being assumed.05Aftercare in writing
Panel cleaning, inverter checks and warranty questions: what we offer after the installation is written into the quote, with who does what.
Not sure whether your roof is suitable?
Ask about a surveyRecent writing
Home battery storage: what to know before buying
Interest in home batteries has grown in Japan, partly because of worry about power cuts in typhoon season and partly because using your own solar power has become more attractive as FIT rates have come down. This note covers the practical questions that come up most when a household considers storage.
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Japan's feed-in tariff scheme for solar has been running since 2012, and the rules have changed enough times…
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Not all solar panels behave the same way in Japan's climate. Hot, humid summers and the typhoon season affect output…
A bit more
Our office is in Marugame, Kagawa. We do not publish a service area: if your property is elsewhere, tell us where and we will say by email whether a visit and an installation are practical. Which electrical contractor does the wiring, and which registrations it holds, is stated in the written quote.
We look at the roof first and the numbers second.Which solar option suits your property?
Answer three questions and we will point you to the part of our work that fits best. It takes about a minute, and nothing is sent anywhere.
Request a survey
Tell us about your property and roof
Tell us where the property is, what kind of building it is and what you have in mind. We will read it and reply by email; if we can take the project on, the reply proposes how a site survey would work.