We had an AGM battery failure do to cold last weekend. Battery went from a full charge to nothing in 3 hours after the temp dropped to 21 degrees. The Bluetooth app stated the battery temp was at 0. The Renogy tech support stated that once the battery gets so cold, our charge controler would not be able to give accurate readings, it showed 11.6 volts. The next day after temps made it back to 40, the battery began charging via solar again.
After getting home the battery showed a complete charge, I disconnected the battery and let it rest for 2 hours, then load tested it. It failed the load test, Renogy is sending a replacement.
We have a 320, the battery is stored in the dog house. So not inside where it is warm. Has anyone had a similar problem with cold temps and an AGM battery?
2017 [email protected]
Outback white w black trim / 2019 Subaru Ascent White with black trim / Birch Bay WA.
aka BirdieJane towed by Quinn