1. Find your spot
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—
No GPS? Enter coordinates
2. Pick your goal
Recommended: —° tilt, facing —.
Monthly sunlight
with clouds clear-sky max kWh/m²/day
3. Line it up
- Lay the phone flat on the panel, screen up.
- Point the phone's top edge the way the panel faces.
- Steer the open ring onto the target and adjust until the box reads aligned.
Waiting for sensors…
ideal best with wall you now
① Aim the phone at the wall
Stand by the panel, hold the phone flat and level, and point its top edge straight at the wall. The grey wedge follows where you aim.
Pointing: —
Wall set — toward —
How much does it block?—
② Now lay the phone on the panel and line it up.
How it works
Your tilt target comes from real measured sunlight, not just theory: 20-year NASA satellite irradiance and ECMWF reanalysis for your exact coordinates are cross-checked, then a clear-sky physics model (sun declination, hour angle, air-mass haze) is weighted by each month's real cloud cover to find the angle that collects the most energy over your chosen period. Cloudy seasons count for less. Offline, it falls back to the physics model. Headings use true north, so "south" already accounts for magnetic declination. The dome maps that same model over every tilt and aim at once; if a wall blocks part of the sky it re-finds the best reachable spot and tells you how much sun that costs.