Solar Energy Calculators
Free solar energy calculators: panel output estimator, system size, payback period, carbon savings, battery bank sizing, and more tools.
Solar Pool Heater Payback Calculator
Estimate years to payback for a solar pool heating system. Compares to gas or electric heater costs over a typical season in your climate.
Solar PV String Sizing Calculator
Size your solar panel strings safely from inverter MPPT range and panel Voc with temperature compensation. Avoid overvoltage on cold mornings.
Solar Inverter Sizing Calculator
Size a solar inverter from total panel wattage. Calculate DC-to-AC ratio, oversizing tradeoffs, and get string inverter or microinverter recommendations.
Solar Panel Optimal Tilt Angle Calculator
Calculate the best tilt angle for solar panels by latitude and season. Get fixed, summer, winter, and adjustable monthly tilt for maximum solar output.
Solar Battery Storage Size Calculator
Calculate the right solar battery storage size for your home in kWh. Enter daily energy use, backup days needed, and depth of discharge to find capacity.
Solar Panel CO2 Savings Calculator
Calculate how much CO2 your solar panels offset each year. Find your carbon footprint reduction and lifetime emissions saved.
Solar Panel Output Calculator
Calculate daily and monthly energy output from your solar panels. Factor in panel wattage, sunlight hours, and system efficiency.
Solar Panel Payback Period Calculator
Calculate how many years until your solar panel system pays for itself. Factor in cost, energy savings, and export tariffs.
Solar System Size Calculator
Calculate how many solar panels you need from annual electricity usage and local sun hours. Get system size in kW, panel count, and estimated roof space needed.