Solar Panel Output Calculator
Estimate how much electricity your solar panels will produce. Enter your system size and region, and see output per day, month, and year — plus the summer-to-winter swing and total lifetime production after panel degradation.
Know your panel count & wattage?
Annual production
10,512 kWh
- Per day (average)
- 28.8 kWh
- Per month (average)
- 876 kWh
- Summer day (peak)
- ≈ 38.9 kWh
- Winter day (low)
- ≈ 17.3 kWh
- Lifetime (25 yr)
- 247,620 kWh
Production = system kW × peak sun hours × 365 × derate. Summer/winter are rough seasonal swings around the annual average. Lifetime applies ~0.5%/yr panel degradation.
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Open calculatorSources & standards
This tool's methodology and data follow US standards and authoritative public datasets: