How this solar calculator works
When you drop a pin, we send your location to NREL's PVWatts® model — the same solar-resource data used across the US solar industry — which estimates how many kilowatt-hours your system would generate each month based on local sunlight, your roof orientation, tilt, and typical system losses. We then layer on the economics: your electricity rate determines bill savings, and your installed cost determines payback. Unlike most solar calculators, we do not apply the expired 30% federal tax credit, so your 2026 numbers are realistic.
Frequently asked questions
How accurate is this solar estimate?
Production is modeled by NREL PVWatts using real location-based solar data, so it's a solid ballpark. Your actual output depends on exact roof shading, panel quality, and local weather — a site visit from an installer refines it.
Is solar still worth it in 2026 without the federal tax credit?
Often yes in sunny, high-rate areas, but payback is longer than before the 30% credit expired on December 31, 2025. State incentives, net metering, and your electricity rate now drive most of the return.
Does this include battery storage?
This tool estimates solar production and payback. For battery economics, use our Solar + Battery ROI calculator.