About FreshSuns

Why calculators first?

Solar proposals are full of projections - production, savings, payback, lifetime return. Those numbers are easier to judge when you have already worked out a rough version yourself. FreshSuns gives you simple, transparent tools so you can see how each input changes the result, and spot quotes whose assumptions look optimistic.

What you will find here

• Solar calculators: a savings and system-size estimator, a simple payback and ROI calculator, and a carbon offset estimator.
• Planning guides on panel efficiency ratings, home batteries, maintenance and going off-grid.
• A planning FAQ with the questions worth asking every installer.

How the calculators work

All calculations run in your browser using the values you enter plus a few simplified assumptions (for example typical panel wattage and system cost per watt). Nothing you type into a calculator is sent to us. Because the models are simple, results are ballpark figures - useful for comparison, not a substitute for a professional design.

What we are not

FreshSuns does not sell, finance or install solar systems, does not provide quotes or site assessments, and is not a financial adviser. Please read our disclaimer.

How the site is funded

The site may display advertising served by Google AdSense. Advertisers do not influence our tools or articles.

Found a bug in a calculator or have a suggestion? Please use the contact page.