Opti Solar: Panel Angle

What angle should your solar panels be at today? Measure it yourself.

Opti Solar helps you get the most out of your solar panels — whether you are planning a first installation or adjusting panels already in place.

Rooftop, ground mount, carport, balcony, garden, RV, van, boat, portable panels, off-grid cabin or remote site where grid power can be unreliable — Opti Solar adapts anywhere.

🎯 PRECISION MEASUREMENT
Rest your phone on the panel: tilt angle and true azimuth, instantly. The compass detects magnetic interference. Lock your reading with a single tap.

🌑 SHADOW HUNTER — SHADING ANALYSIS
Measure nearby obstacles (trees, chimneys, buildings) and see when they cast shade on your panels through the year. Useful before buying, to avoid a shaded spot that wipes out your winter output.

☀️ SUN PATH IN AUGMENTED REALITY
Point your phone at the sky and follow the sun across it. Compare today with the summer and winter solstices. Capture a photo with GPS, date and measured angles for your records.

📊 SOLAR SCORE (0–100)
Tilt, orientation, shading, yield — every criterion is scored, with concrete recommendations.

🔬 SCIENCE-BASED CALCULATIONS
Estimates use 6 climate zones calibrated on PVGIS (European Commission), NREL PVWatts (United States) and NASA POWER satellite data. Automatic adaptation to your hemisphere: Paris, Lima, Sydney, Sanaa, Reykjavík.

💰 FINANCIAL SIMULATOR
Annual savings, payback time, self-consumption rate, year-by-year return. Based on your local electricity price.

📅 SEASONAL CALENDAR (adjustable mounts)
Recommended angle at every equinox and solstice. Adjust 2 or 4 times a year and increase output by up to 8% compared with a fixed mount.

📈 PRODUCTION TRACKING
Enter your monthly output and compare it with the estimate. Alerts when production falls short.

🗺️ ROOF MAPPING
Draw the outline of your roof on a satellite map and estimate the usable area for your panels.

📄 PDF REPORTS
Three levels: Simple (1 page), Detailed, or Pro with client data. For your records, maintenance, installer discussions or client files.

📡 OFFLINE MODE
No signal, remote site? Opti Solar falls back on local calculation. No errors, no interruptions.

🔧 BUILT FOR OUTDOOR USE
Manual light/dark switch for readability on the roof, spoken measurement readout, large type, plain wording.


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✅ FREE — No ads, no account to create, no tracking beyond anonymous crash reports
• Precision compass and inclinometer
• Solar production estimate (hemisphere-aware)
• Solar Score with per-criterion detail
• Financial simulator
• Seasonal calendar and notifications
• Simple PDF report

⭐ PREMIUM — One-time purchase, lifetime access. No subscription. No further in-app purchases.
• Shadow Hunter (shading analysis of obstacles)
• Full AR sun path
• Photo with installation certificate
• Roof mapping on a satellite map
• Detailed and Pro PDF reports
• Production tracking with charts and alerts
• Personalized Solar Score recommendations

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GOOD TO KNOW
Opti Solar does not charge your phone and is not a solar charger: it is a measuring tool that tells you which angle to aim a panel at, from a rooftop to a portable camping panel. It does not sell solar panels, does not connect to inverters, and does not guarantee production. Accuracy depends on your phone's sensors, GPS quality and magnetic interference near the panel.

Built by an independent developer. No data resold. One app, one price, for life.