Solar
Comprehensive solar photovoltaic system calculators for array sizing, panel counts, battery storage, ROI payback, roof space, inverter matching, and utility savings.
Free online general tools.
Solar Battery Calculator
Size energy storage battery systems (Tesla Powerwall, Enphase, LiFePO4) to store surplus daytime solar production for overnight use and blackouts.
Solar Energy Production Calculator
Estimate monthly and annual kilowatt-hour (kWh) solar electricity generation factoring in array tilt angle, azimuth orientation, and weather patterns.
Solar Installation Cost Calculator
Itemize full turnkey residential solar installation costs across PV modules, inverters, racking hardware, permitting, electrical upgrades, and labor.
Solar Inverter Calculator
Size and match string inverters or microinverters to your solar array, calculating DC-to-AC ratio and preventing clipping losses.
Solar Panel Quantity Calculator
Calculate the exact number of solar panels needed based on required system kW capacity and individual panel wattage ratings (350W - 450W).
Solar Payback Calculator
Calculate simple and discounted solar payback periods in years factoring in upfront costs, federal tax credits, utility savings, and electricity inflation.
Solar ROI Calculator
Evaluate long-term Return on Investment (ROI), Net Present Value (NPV), and Internal Rate of Return (IRR) of a solar panel system over 25 years.
Solar Roof Space Calculator
Calculate the total square footage and dimensions of roof area required to mount your solar panel array, accounting for fire setbacks.
Solar Savings Calculator
Forecast cumulative 10-year, 20-year, and 25-year utility bill savings from solar generation based on compounding electric utility rate inflation.
Solar System Size Calculator
Calculate total residential or commercial solar photovoltaic (PV) system capacity in kilowatts (kW) to offset 100% of your annual electricity consumption.