Editable calculators for solar economics and home-backup power. No email, quote form or sales call.
Estimate system size, cash cost, annual savings, payback and 25-year return using your bill, electricity rate and quote assumptions.
Add essential appliances one by one to estimate daily energy, minimum rated battery capacity and simultaneous running output.
Estimate how long a battery will run a load, or reverse the calculation to find the capacity needed for a target runtime.
Every calculator exposes its assumptions. Replace planning defaults with figures from your utility bill, equipment label, installer quote or manufacturer manual. The tools do not collect contact details and do not send results to installers.