Antti K. Koskela • 4/14/2026

How to estimate solar panel output in Home Assistant with a Lux/UV sensor

This article explains how to estimate solar panel output in Home Assistant using a simple Lux/UV sensor from a Bresser 7-in-1 weather station, after losing direct inverter data due to a home battery system. It covers the background, problem, and solution, including using solar radiation, sun elevation/azimuth, panel tilt, and temperature derating. The method is suitable for automations like EV charging and load shifting, though not billing-grade. The author provides a practical workaround for when inverter integrations are broken or flaky.

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#Home Assistant #Solar Estimation #Lux Sensor