Tools
Solar calculators and checks
Free tools that run in your browser with your state's prices and 2026 rules. Nothing you type is sent anywhere, and every result can be saved as a link or printed on one page.
Thinking about solar
Check a solar quote
Lease, PPA, loan, cash or prepaid: what each kWh costs you against what it saves.
Compare quotes
Two or three quotes side by side, ranked by cost per kWh.
Payback calculator
How long a system takes to pay for itself, with or without a battery.
Plug-in solar
What a balcony kit makes and saves, and where it is legal.