Solar Calculators
Every calculator here uses real 2026 data (EIA rates, NREL PVWatts production, DSIRE incentives) and runs instantly in your browser. No sign-up.
Solar ROI Calculator
Calculate solar payback period, 25-year savings, and ROI for your state. Real EIA electricity rates, NREL PVWatts production, and state incentives — updated for 2026 (federal ITC expired).
Try it →Reverse Solar Payback Calculator
Work backwards: set a target payback period and see what electricity rate, export credit, or state incentive you need to hit it. Free, instant, no sign-up.
Try it →Compare Solar Economics Across States
Compare electricity rates, solar production, payback period, and state incentives side by side for any 2–3 U.S. states. Free interactive comparison tool.
Try it →Is Solar Worth It For Me?
Answer 5 quick questions about your state, electricity bill, roof, and plans. Get a personalized green / yellow / red verdict on whether solar is worth it for your home in 2026.
Try it →Solar Financing: Cash vs Loan vs Lease
Compare the real 25-year cost of buying solar with cash, financing with a loan, or leasing. See why cash has the highest IRR and leases deliver the lowest long-term value.
Try it →Solar Battery Payback Calculator
Estimate whether adding battery storage to your solar system pays off — critical for NEM 3.0 states like California where export credits are low.
Try it →SREC Income Calculator
Estimate annual and 15-year income from Solar Renewable Energy Credits (SRECs) in NJ, MD, IL, PA, and other SREC states. Current 2026 market prices.
Try it →Solar System Size Calculator
Find the right solar system size in kW and number of panels for your home, based on your electricity usage, state, and coverage goal.
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