Hi @sunnysideal it’s possible there’s a hardware issue instead or a siting limitation. A perfectly functioning battery and solar power module will keep the Tempest charged, and out of any power saving modes unless bad stretches of weather occur.
You can use the table below to get a very rough estimate of the plane of array (POA) irradiance received to determine if it’s enough to induce a charge on the battery.
Determine the following information:
- Installation latitude
- Peak solar irradiance on a previously clear day
Let’s assume a 45 degree latitude, in November, with a peak solar irradiance of ~250W/m^2.
We use the peak factor table to reference a “1.9” ratio based on 45 latitude and month of Nov.
Multiply 250W/m^2 x 1.9 = 475 W/m^2. This value is the plane of array irradiance on a South facing panel (which doesn’t actually exist!) but that gets us closer to a more representative value.
In this scenario, we might expect the 2 primary panels (SE, SW) to induce a charge on the battery around solar noon. Remember the charging threshold requirement is about 350W/m^2.
You can also use the ratio of the peak factor to quickly determine if the POA irradiance is going to be greater or less than the GHI value measured by the light sensor.