Where are you?
Finding your location…
What's the goal?
When do you want the most power?
Ideal: —° tilt, facing —.
Monthly sunlight
with clouds clear-sky max kWh/m²/day
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.
Line it up
ideal best with wall you now
Rest the phone flat on the panel, then tilt & turn the panel to move the ring onto the target.
Point the phone at the wall
Hold the phone flat and aim its top edge at the wall, then tap Set — or drag the dome.
Phone points: —
—
Rest the phone on a surface you know is flat, then calibrate to zero out drift.
Lay the phone flat on the panel — portrait, top edge toward the panel's top.
☀ Turn your screen brightness all the way up before you climb.
Tip: Share ▸ Add to Home Screen first — Safari's bars eat a chunk of this screen.