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
| City | Lat | Summer | Spring/Fall | Winter |
|---|---|---|---|---|
| Miami | 26°N | 11° | 26° | 41° |
| Houston | 30°N | 15° | 30° | 45° |
| Atlanta | 34°N | 19° | 34° | 49° |
| NYC | 41°N | 26° | 41° | 56° |
| Chicago | 42°N | 27° | 42° | 57° |
| Seattle | 47°N | 32° | 47° | 62° |
| Minneapolis | 45°N | 30° | 45° | 60° |
| Denver | 40°N | 25° | 40° | 55° |
| Phoenix | 33°N | 18° | 33° | 48° |
| LA | 34°N | 19° | 34° | 49° |