General disclaimer
The calculators, articles, and other content on SolarSize are provided for general information and educational purposes only. While we work hard to keep our calculators accurate and our content up to date, we make no representations or warranties about the completeness, accuracy, or reliability of any information or calculation on this site. Your use of the site is at your own risk.
Solar calculators are estimates, not professional advice
Our solar calculators — including the solar panel, cost, savings, payback, ROI, battery and output calculators — produce estimates based on the numbers you provide and on standard industry formulas, sun hours, and cost assumptions. They are simplified models, not exact computations of your specific home, roof, or electricity tariff.
Electricity rates, sun hours, panel prices and incentive rules vary by brand, region, and country, and they change over time. Nothing on this site constitutes financial advice, engineering advice, or a substitute for consultation with a qualified solar installer or licensed electrician. Before buying a solar system, signing an installation contract, or making any significant financial commitment, verify your figures with local installers and check current local rules — including net-metering and incentive rules in your area.
No professional relationship
Using our calculators or reading our articles does not create a professional, advisory, or fiduciary relationship between you and SolarSize or its operators. We are a free calculators website, not a solar installer, energy advisor, or financial adviser.
Verify before you act
Always verify calculator outputs against official sources — such as installer quotes, manufacturer datasheets, and local regulations — before relying on them. If a result looks surprising, double-check your inputs: most “wrong” answers trace back to a mistyped number, not a broken calculator. If you believe a calculator itself has an error, please tell us via the contact page so we can investigate and fix it.
No liability for decisions
We are not liable for any loss, damage, or expense arising from decisions you make based on this site’s calculators or content — including buying the wrong system size, installation costs, or savings that turn out lower than estimated. See our Terms of Service for the full limitation of liability.
Advertising and affiliate disclosure
SolarSize does not currently run display advertising, which keeps every calculator free for now. If advertising is added in future, ads will be served by third-party networks and clearly distinguishable from our calculators and content. We do not currently participate in affiliate programs; if that changes, this page will be updated. Advertisers would never see what you type into our calculators, because all calculations happen in your browser.
External links
We link to official sources (manufacturers, standards bodies, supplier guides) so you can verify our methodologies. We do not control these external sites and are not responsible for their content, accuracy, or privacy practices.
Contact
Found an error or have a concern about our content? Email support@solarsize.site — corrections from readers genuinely improve the site.
Last updated: November 2026.