Frequently Asked Questions
How many solar panels do I need?
Annual kWh ÷ (panel wattage × peak sun hours × 365 × system efficiency ≈ 0.8). A 10,000 kWh home with 400 W panels at 5 sun hours needs about 17 panels.
What are peak sun hours?
Equivalent hours of full 1,000 W/m² sunlight per day. The US ranges from about 3.5 (Pacific Northwest) to 6+ (Southwest). A panel's output scales with this.
Do solar panels work on cloudy days?
Yes, but at reduced output - typically 10-25% of peak. They still produce energy from diffuse light, just much less than in direct sun.
How long do solar panels last?
25-30 years with gradual output decline (~0.5% per year). Most manufacturers warranty 80-85% performance at 25 years.
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This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.