Free calculators to plan solar, battery backup, generators, EV charging and off-grid systems. Each one shows its assumptions and sources; the results are estimates to help you plan and compare quotes, not a design.
Solar potentialHow many panels fit your roof and how much power they would make in a year, from your address.Try it free →Solar savingsWhat solar could save you each year and how long it takes to pay for itself, with your real rate.Try it free →Battery backupPick what you need to keep running in an outage and see what size home battery gets you through.Try it free →Generator sizingAdd your appliances to find the generator size you need, running and starting watts.Try it free →EV charging costWhat charging your car at home costs per month and per mile, compared with gas.Try it free →Off-grid plannerSize the solar panels, battery bank and backup generator for a cabin or home with no power line.Try it free →
When you are ready, each calculator can pass your numbers to a free quote request. SolutionEnergy is an independent guide; see how it works.