Last updated: October 21, 2026
Estimates, not professional advice
EcoForeman's calculators and guides give estimates for planning and education only. They are not engineering, electrical, financial, tax or legal advice, and they are not a quote.
Results depend on the numbers you enter and on general assumptions such as average sun hours, efficiency losses, installed costs and electricity rates. Your real costs and savings will depend on your home, location, tariff, installer, equipment and how you use energy.
Before you buy or install anything, get written quotes from qualified, licensed installers and check the figures with them.
Prices, rates and incentives
Equipment prices, electricity rates, export payments, tax credits and rebates change often and vary by country, state and utility. Where a page uses them, it shows the source and the date checked, but they may have changed since. Confirm current incentives with the official programme or a tax professional.
Safety
Electrical work, battery installation and changes to heating systems can be dangerous and are regulated in most places. Use a qualified professional and follow local codes and manufacturer instructions.
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EcoForeman is free to use and is supported by advertising and affiliate links. When you click a partner link and buy something, we may earn a commission at no extra cost to you. Partner links are labelled "Partner" or "we may earn a commission". Commissions never change a calculator's result.
How our content is made
Calculators are written and tested by hand, and each one shows its formula. Guides may be drafted with the help of AI tools, but every guide is researched, fact-checked and edited by a person before it is published, and numbers are checked against their sources.
Errors and corrections
If you find a mistake, email info@ecoforeman.com with the page and the numbers you used. We review every report.