Enter your electric bill and location to find out exactly how many solar panels your home needs.
⚠️ This is an estimate based on your average usage. Shading, roof orientation, and actual sun hours in your specific location affect the final panel count. A licensed installer will perform an exact site assessment.
Most American homes need between 15 and 25 solar panels to cover their full electricity usage. The exact number depends on how much electricity you use, how sunny your location is, and the wattage of the panels you choose.
To calculate panel count: take your monthly kWh usage, divide by 30 to get daily usage, then divide by your location's average peak sun hours and a system efficiency factor (typically 78%). That gives you the system size in kW. Divide by the panel wattage and round up for the panel count.
Standard residential panels in 2026 are rated at 400–440 watts. Premium TOPCon panels reach 440–500 watts. Higher wattage means fewer panels needed for the same output — useful if your roof space is limited. Most installers use 400W panels as the baseline for sizing estimates.