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Lay your iPhone flat against the panel surface. SolarPanelAngle reads the tilt and heading and shows how far to adjust. It turns green — with a sound and a tap — when the panel is aimed at the optimal angle.

That rule is for permanent roof arrays optimized over a year. For a few hours of portable charging, the best angle depends on the time of day and season — often much steeper. SolarPanelAngle computes it for your actual charging window.

No. The sun's position is calculated on your device from the date and your location using astronomical formulas. SolarPanelAngle works entirely offline and collects no data.

Estimates assume a clear sky and include temperature loss, so they track real output well on sunny days. Actual output varies with clouds, shade, temperature and panel condition — treat the numbers as a planning aid.