[Foldbak]

Originally Posted by Todd & Mary

Welcome to the world of LIFPO4! You may want to take the cold charge shutoff temp up a few degrees just for safety I have mine set at 41. That would give me time to address the situation before the temp drops lower. I chose to heat the battery bay and keep it at 50 degrees. I have 9 100ah Relion batteries and it is too large an investment to risk damage from low temp charging. The specs from the OEM for my batteries are below, just as an example.

Charging Temperature
LiFePO4 batteries can be safely charged between -20°C to 55°C (-4°F to 131°F). However, at temperatures below 0°C (32°F) the
charge current must be reduced, until the temperature is >0ºC (32ºF), as follows:
1. 0°C to -10°C (32°F to 14°F) charge at 0.1C (10% of the battery capacity)
2. -10°C to -20°C (14°F to -4°F) charge at 0.05C (5% of the battery capacity)

Thanks Todd. I think I'll raise it to 40. I do plan on getting a heating pad at some point. I live at 1500 feet and only see temps below 32 about 20 days a year.