Free Calculator

Solar ROI Calculator

Does a rooftop solar system actually pencil out for you? Enter your bill and utility to find out — with NEM 3.0 rates already baked in.

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Your situation

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Your results

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Enter your monthly bill and utility,
then click Calculate.

System size
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kilowatts (DC)
Estimated cost
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installed, 2026
Monthly savings
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under NEM 3.0
Simple payback
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years
Verdict
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No federal tax credit for 2026 The 25D federal solar tax credit expired December 31, 2025. No federal credit applies to 2026 installations. This calculator reflects that — no credit is subtracted.
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Add a battery, improve payback A battery storage system shifts more production to self-use, improving effective payback by 1–3 years under NEM 3.0 — especially for SDG&E and PG&E customers.
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Efficiency first, then solar Air seal and insulate first — a more efficient home needs a smaller, cheaper system. Every dollar you don't spend on extra panels is a dollar saved.

Assumptions: CA average solar production 1,350 kWh/year per kW · NEM 3.0: 45% self-consumed at your retail rate, 55% exported at 6.5¢/kWh · Installed cost $3.10/W (2026 market, no federal credit) · System sized 3–20 kW · Rate used: —/kWh.