Sun Peak Hours Calculator
Estimate peak sun hours for your location.
Sun Peak Hours Calculator
Estimate peak sun hours for your location
Formula
Based on latitude zone lookupHow to Use
- 1Enter your latitude — Input your latitude to estimate solar irradiance for your location.
- 2Select the month — Choose a specific month or view annual average.
- 3Review peak sun hours — See estimated peak sun hours (PSH) per day for your location.
- 4Use for system sizing — Multiply PSH × panel kW to estimate daily kWh production.
Frequently Asked Questions
What are peak sun hours?
Peak sun hours (PSH) represent hours of 1,000 W/m² solar irradiance. 5 PSH means total daily solar energy equals 5 hours at full sun intensity.
How many peak sun hours does my area get?
The US Southwest averages 6-7 PSH. The Northeast averages 3-4 PSH. Our calculator estimates based on your latitude and season.
Does cloudy weather reduce peak sun hours?
Yes, significantly. Overcast days may produce only 10-25% of clear-day irradiance. Annual averages already account for typical weather patterns.
How do peak sun hours affect solar panel sizing?
Fewer PSH means you need more panels. Example: 30 kWh/day ÷ 5 PSH = 6 kW system. With 4 PSH, you need a 7.5 kW system.