B005-S: The external temperature sensor indicates battery temperature too low.

The measured battery temperature is too low.
This measured value is displayed by the “Caused by” variable, visible at the Events on MyPowerRouter.com

When Batteries are cold, their energy output is lower than at 25degrees.
To prevent Battery damage, the PowerRouter will reduce the depth of discharge to 25% instead of the (default) 50%, when the measured temperature is lower than 10 degrees.
It will resume normal behavior when the battery temperature exceeds 13 degrees.