Pre-filled for 2500 kWh of monthly usage at the U.S. average of 4.9 peak sun hours/day — adjust both to match your actual bill and location.
This sizes for 100% annual offset under net metering — actual panel count depends on your specific panel wattage, roof orientation, and any shading, which can shift the real number up or down.
At 2500 kWh a month (30,000 kWh a year), sizing for full annual offset under net metering gives a starting system size — real installers also factor in roof orientation, shading, and your specific panel's wattage, which is why the panel count here is an estimate to refine, not a final purchase number. Cross-check against your actual bill with the kWh usage from bill calculator if 2500 kWh isn't your exact figure, then get a precise system and cost estimate with the full solar panel calculator.
It depends heavily on home size, climate, and appliances — 2500 kWh/month works out to 30,000 kWh/year, which you can compare against your own utility bill or the kWh usage from bill calculator if you're estimating from a dollar amount instead.
No — this uses an annual average sun-hours figure. Production swings meaningfully by season; see the seasonal output calculator for how much lower winter months typically run compared to summer.