Free solar panel comparisons, savings calculators, payback period tools, and incentive finder for U.S. homeowners.
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Solar Generators & Portable Power
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Enter your details and get instant solar estimates — no installer required.
Select up to 3 panels to compare side-by-side — or browse all 20 panels below. Data sourced from manufacturer spec sheets — see our data accuracy policy for details.
Showing all 20 panels in database. Prices are estimates ($/W installed). Always get installer quotes for your specific system.
Data, tools, and resources to make the smartest decision for your home.
Enter your electric bill and location to see your estimated savings over 25 years.
Calculate the right system size in kW to fully offset your electricity usage.
Check your federal ITC eligibility by install year and see how it reduces your net system cost.
Side-by-side specs for 20 top panels — efficiency, power output, warranty, and price per watt.
Get matched with vetted local solar installers and compare multiple quotes.
Compare home battery options (Tesla Powerwall, Enphase, SunPower) and costs.
Use our calculators to know your numbers, then connect with vetted local installers for a final bid. Most homeowners get 3 quotes — we help you compare them.
Get Free Installer Quotes →Every calculator on this site uses a documented formula, not a black box. Each calculator page has a "How This Calculator Works" section with the exact formula, a worked example, and a list of what the estimate does and doesn't account for.
Peak sun hour estimates follow the NREL PVWatts methodology, the industry-standard approach for location-based solar production modeling. Electricity rate context reflects publicly available EIA rate ranges. Tax content is checked against IRS.gov and the DSIRE state incentive database. Panel specs come from manufacturer datasheets at the time each entry was added.
These are educational estimates using regional averages, not a site-specific engineering assessment. Your roof orientation, shading, exact utility rate structure, and financing terms all affect real numbers. Always get a written proposal from a licensed installer before purchasing.
Content across this site was last reviewed for accuracy on August 13, 2026. Read the full methodology on our About page, or see the Disclaimer for data-accuracy and revenue-disclosure details.