Solar panel sizing, savings, payback, and incentive calculators. Browse our free solar tools below — all calculators are instant, accurate, and require no sign-up.
Community Solar Savings Calculator — Calculate your savings from a community solar subscription. Compare your utility rate to the community solar rate and estimate annual bill reductions.
Off-Grid Solar Sizing Calculator — Size an off-grid solar system with battery storage for autonomous living. Calculate panels, batteries, and charge controller requirements.
Solar + Battery Savings Calculator — Estimate additional savings from pairing solar panels with battery storage. Calculate self-consumption gains and peak rate arbitrage value.
Solar Panel Degradation Calculator — Calculate how solar panel output declines over time due to degradation. Estimate year-by-year production and total lifetime energy output.
Solar ITC (Investment Tax Credit) Calculator — Calculate your federal solar Investment Tax Credit (ITC) based on total system cost. Estimate the 30% federal tax credit for residential solar installations.
Solar LCOE Calculator — Calculate the Levelized Cost of Energy (LCOE) for your solar system. Compare your solar electricity cost per kWh against utility rates.
Solar Net Metering Calculator — Calculate your annual net metering credits from excess solar energy exported to the grid. Estimate your credit value based on export rates.
Solar Panel Count Calculator — Calculate how many solar panels you need based on your system size in kW and individual panel wattage. Free panel count estimator for residential and commercial installs.
Solar Panel Output Calculator — Calculate daily and annual energy output from solar panels based on wattage, peak sun hours, and system derate factor. Free online solar production estimator.
Solar Payback Period Calculator — Calculate how many years it takes for solar panels to pay for themselves through electricity savings. Free solar payback estimator with incentive support.
Solar PPA vs Lease vs Buy Calculator — Compare the net present value of a solar PPA, lease, and cash purchase over 25 years. Find the best solar financing option for your home.
Solar ROI Calculator — Calculate the return on investment for your solar panel system over its lifetime. Compare solar ROI against other investments with this free calculator.
Solar Savings per Year Calculator — Estimate your annual electricity savings from solar panels based on system production and utility rates. Free solar savings estimator.
Solar Roof Area Needed Calculator — Calculate the roof area required for your solar panel installation based on panel count and dimensions. Free solar roof space estimator.
SREC Value Calculator — Calculate the annual value of Solar Renewable Energy Certificates (SRECs) based on system size, capacity factor, and current SREC market prices.
Solar System Size Calculator — Determine the right solar system size in kW based on your annual electricity usage, peak sun hours, and system efficiency. Free solar sizing tool.
State Solar Incentive Calculator — Calculate total solar incentives by combining federal ITC with state rebates, tax credits, and utility incentives. Estimate your true net solar cost.