PVLevel vs SunStem

The Bubble Level for Professional PV Installers. Measure & Align Your PV Solar Panels On-Site Perfectly in Real Time. Displays Instantly Energy & Earnings Predictions. No Tools Required — Just Your Phone. Running On Live Phone Sensor Measurements & Scientific Solar Data. Scientific accuracy back-tested with average errors smaller 1,0% (max. errors smaller 5% for irrelevant orientations) on PVGIS solar data base Experience how changing the orientation of your PV panels benefits the energy production and earnings in real-time. Collaborate with your co-workers & update your customers in real-time. PVLevel guides you with ease through all the phases of measuring, optimizing, planning & even installing your next home PV system or simply aligning your mobile PV panel on your next camping trip in no time! Use your mobile device and its integrated sensors as measuring tool to measure the solar panel orientations in real-time, displaying the predicted solar energy and expected money gained with every move of your device! Align your device parallel to the roof or planned panel orientation and PVLevel does everything else for you. Verify your installation process by measuring the actual orientation of the PV panels before tightening the screws! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

SunStem is an offline solar and battery calculator for RVs, vans, boats and cabins. Build a saved system profile, then estimate battery runtime, solar yield, reserve risk and safer system sizing on iPhone or iPad. CALCULATE BATTERY RUNTIME - Compare load, solar and usable battery capacity - Forecast the next charge window and hours to the reserve floor - Work offline from a saved profile and local inputs SIZE AN OFF-GRID SYSTEM - Review battery, PV, MPPT, inverter, wire and fuse planning outputs - Check voltage drop, cold Voc and fuse-versus-wire safety gates - See assumptions and deterministic calculations from the native core AUDIT THE NEXT SEVEN DAYS - Scan daily reserve risk from saved load and solar assumptions - See what to shed, when to charge and why the risk changed - Export facts for a trip partner, installer or hardware review No cloud account is required before first value. SunStem provides planning estimates and field-review evidence, not engineering certification. It does not control chargers, inverters or BMS hardware. Background or unattended hardware monitoring is not promised in this release.