TechWriter, I guess I should explain what I meant about waiting for warmer weather.
We are currently NW of Phoenix with the highs currently reaching the upper 50s and the lows going to upper 30s-lower 40s. I'm a wuss and waiting for temps above 60° before I do the install.
Per SOK, the BMS will shut down charging at 0°C BATTERY temp (not ambient temp), but will allow discharge to a lower temp. Charging would be turned back on at 5°C. I don't know for sure but I would expect it would take a few hours below ambient freezing for the cells to get to freezing temperature. Therefore, I don't see the need for a heater.
