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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)
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2021 Montana 3761FL, 9 LIFPO4 batteries & 1700 watts of panels w/ Multiplus II 3K inverter and 30amp DC to DC charger from truck. 8k Dexter axles w/ Kodiak disc brakes.
2019 6.7 diesel F350 DRW with Banks derringer and 4"exhaust, airlift bags, 25k B & W Companion hitch, 45 gal. aux. diesel tank and 14k Winch, just in case!
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