Solar Angle & Sizing Helper

Quick Angle Rule

Use your latitude (°N). Approximate fixed tilt:

  • Summer: Lat − 15°
  • Spring/Fall: Lat
  • Winter: Lat + 15°

Summer: 25° Spring/Fall: 40° Winter: 55°

PV Sizing

Est. harvest: 1.2 kWh/day Charge current @ 28V: 14.3 A

Controller must handle current & PV Voc (cold). If harvest < your daily use, add panels or hours.

U.S. Latitude Cheats

CityLatSummerSpring/FallWinter
Miami26°N11°26°41°
Houston30°N15°30°45°
Atlanta34°N19°34°49°
NYC41°N26°41°56°
Chicago42°N27°42°57°
Seattle47°N32°47°62°
Minneapolis45°N30°45°60°
Denver40°N25°40°55°
Phoenix33°N18°33°48°
LA34°N19°34°49°

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