Estimate solar system size, number of panels, roof space, daily energy production, monthly solar production, annual production, electric bill savings, payback period, and battery backup needs. Use this solar panel calculator for home solar planning, off-grid estimates, RV solar sizing, cabin power, and basic solar energy comparisons.
System sizing:
The calculator uses daily energy use, peak sun hours, solar offset goal, and system losses to estimate the solar system size needed in kilowatts.
Panel count:
The needed system size is divided by panel wattage to estimate how many solar panels are required.
Production estimate:
The calculator estimates daily, monthly, and annual solar production based on system size, sun hours, and system efficiency.
Savings and payback:
Estimated solar production is multiplied by your electric rate to estimate monthly savings, annual savings, system cost, net cost, and payback period.
A solar panel calculator helps estimate the size of a solar system before comparing quotes, planning roof space, sizing battery backup, or estimating savings.
It can help compare solar system size, panel count, roof space, daily production, monthly production, annual production, battery backup needs, estimated cost, incentives, savings, and payback period.
Your result shows estimated solar system size, number of solar panels, total panel wattage, usable system output, roof space needed, daily solar production, monthly solar production, annual solar production, monthly savings, annual savings, estimated installed cost, estimated incentive value, estimated net cost, payback period, and battery backup size.
Estimate your daily energy use, divide by peak sun hours and system efficiency, then divide the required system watts by the wattage of each solar panel.
The number depends on your energy use, panel wattage, sun exposure, roof angle, shading, and desired solar offset. A home using more electricity usually needs a larger solar array.
Peak sun hours estimate how many hours per day sunlight is strong enough to produce rated solar output. More peak sun hours usually means fewer panels are needed.
Solar panels rarely produce perfect rated output all day. Losses can come from inverter efficiency, heat, shade, wiring, panel angle, dust, snow, and normal performance differences.
Yes. Enter daily energy use, backup days, and usable battery depth to estimate the battery capacity needed in kilowatt-hours.