Residential Solar Calculators
Size your home solar system — from panel count to roof fit to annual production.
26 calculators
☀ Solar Panel Calculator
How many panels does your home need? Enter your bill, get your answer.
🏠 How Many Solar Panels Do I Need
The #1 solar question. Bill in — panel count out.
⚡ Solar System Size Calculator
Calculate the right kW system for your home.
🏡 Solar Panel for Home Calculator
Home size to solar system size — quick estimate.
🏗 Solar Roof Calculator
How many panels fit on your roof?
🔌 Solar Power Calculator
How much power will your array produce?
⚡ Solar Energy Calculator
Estimate annual solar energy production.
📈 Solar Production Estimator
Monthly and annual production estimates.
📊 Solar Panel Output Calculator
Real-world output with temperature derating.
💡 Solar Panel Wattage Calculator
Calculate recommended wattage for your needs.
🔄 kW to Solar Panels Converter
How many panels for 5kW? 10kW? Any size.
📊 Panel Efficiency Calculator
Compare efficiency ratings and real output.
🌞 Peak Sun Hours Calculator
Find peak sun hours for your location.
📐 Solar Panel Angle Calculator
Optimal tilt angle for max production.
📐 Solar Panel Tilt Calculator
Seasonal tilt angle optimization.
📐 Solar Panel Area Calculator
Calculate area needed for your system.
🌞 Solar Irradiance Calculator
Solar radiation data for your location.
🌓 Solar Shading Calculator
Estimate production loss from shading.
📊 Solar Panel Comparison
Compare two panels side-by-side: 25-year production, cost per kWh, and value winner.
🏛 Ground Mount Solar Calculator
Calculate land area, row spacing, and cost for ground-mounted solar arrays.
🏗 Solar Roof Load Calculator
Check if your roof can support the weight of solar panels and snow.
📐 Row Spacing Calculator
Calculate minimum panel row spacing to prevent inter-row shading.
🌡 Temperature Coefficient Calculator
See how heat reduces your panel output month by month.
🏠 Solar Pergola Calculator
Size a solar pergola: panels that fit, power output, and shade area.
❄ Snow Load & Winter Calculator
Assess snow weight on panels and estimate winter production losses.
📈 Panel Degradation Calculator
Project your panel output decline over 25 years.