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Solar Plan Builder

Every solar question, answered with your city’s real sunshine.

Eighteen free tools on the same model as our planner: NASA climate data, current prices and your state’s rules. No sign-up, and nothing you type is sent to an installer.

Your town, ZIP or address
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SizeFull solar plannerYour roof from above, panels drawn to fit, twelve months of output, a battery and the money in one plan.
SizeHow many panels do I need?From your bill and the sunshine where you live, not a national average.
Most used
MoneyIs this quote fair?Type in a proposal. We check price per watt, the production claim and the tax-credit maths.
New
MoneyWhat will solar cost me?Any size, any price per watt, with a battery or without: cash, loans, lease and PPA side by side, in dollars.
MoneySolar rule trackerTax credits, export rates and rebates that changed, and the deadlines coming up in your state.
BackupHow long will a battery last?Pick what must stay on in a blackout and watch a battery charge and drain over three days.
BackupBattery runtime by modelPowerwall 3, FranklinWH, Enphase, EcoFlow, Anker SOLIX and Jackery, side by side.
SunBest panel angleThe best tilt for the year, for winter and for summer, and what direction really costs.
SunPeak sun hoursMonth by month for any address, and a table of 828 U.S. cities.
SizePanels by monthly useFrom 500 to 3,000 kWh a month: panel counts, roof area and cost in 19 cities.
SizeSolar for an electric carHow many extra panels an EV needs where you live.
SizeSolar for a heat pumpWhat electrifying your heating adds to the system, from local heating degree-days.
SizeSolar for a pool pumpExtra panels for a pool, sized to your swimming season.
MoneySolar cost by stateTypical system price, state credits and payback for all 50 states and DC.
ProcessHow going solar worksTen steps from first quote to switch-on, with who does what and how long each takes.
ProcessThe guide to going solarTen short chapters in the order you will face each decision.
ProcessVideos and resources16 fact-checked videos and 22 official guides on credits, loans, batteries and DIY.
ProcessThe printable checklist34 boxes to tick before you sign anything. Print it and bring it to the site visit.
Roofus, the Solar Plan Builder mascot

The tools give you ranges. The planner gives you your roof.

Type your address and we trace your house from aerial photos, fit real panels to it and run all of the above in one plan.