Set up monitoring
A battery monitor and system display tell you how full the battery is, how much the array is producing and what you are using, so problems show up early.
How
- Install a meter that reads battery voltage, state of charge and power use, as recommended for stand-alone systems.
- Use the equipment's data logging or app to record daily production and use.
- Compare daily production against the PVWatts or PVGIS estimate for that month. A steady shortfall points to shading, soiling or a fault.
- Set alarms for low state of charge and high battery temperature.
- Review monthly in the first year to check your load audit against reality.
Sources
- Balance-of-System Equipment Required for Renewable Energy Systems. US Department of Energy, Energy Saver, accessed 2026-11
- PVWatts Calculator. National Renewable Energy Laboratory, accessed 2026-11
- Photovoltaic Geographical Information System (PVGIS) online tool. European Commission Joint Research Centre, accessed 2026-11