LIthium
battery heater
Lithium batteries do not like to be charged at freezing temperatures.
I have a 5th wheel RV. The
battery compartment is the forward compartment under the overhang. It is not heated. First, I added extra insulation. Two layers of 1' styrofoam board.
I used an RV tank
heater 7"×24". 12v, 6.25A, 75W. The built in thermostat turns on at 45°F off at 65°F (I would have preferred it turned on at 36⁰F).
The tank
heater pad has it's own adhesive. I chose to tape it to the
battery at one end (so I can remove/adjust it) and wrap it around the
battery. Tape the insulation to the
battery. Wrap it around the
battery AND the
heater, leaving 3" of the
heater exposed at the wire lead end. This end has the thermostat. Leaving it OUTSIDE the insulation will ensure it is exposed to cold temperatures. Put the entire assembly in a
battery box (to anchor it down). This
battery heater is wired to my FLA
battery via inline fuse and a switch. I did this because the FLA
battery can be recharged at any time above or below freezing. I turn on the switch if below freezing temperature is expected. I have insulated my
battery compartment and have a remote thermometer in the compartment AND the
battery monitor Victron BMV-712 has a thermometer attached to the
battery.
While my 5er is stored for the winter I have added a 120vac outlet in my
battery compartment and I use a 120vac 75W plug in
battery heater. I have it laying along the floor of the front of the compartment standing up on edge. One night we had 28°F, that compartment did not fall below 40°F. I got another one and put it in the basement to keep the pipes etc warm. Same results.
Tank
heater https://www.amazon.com/dp/B07ZJMTG7P...ing=UTF8&psc=1
Battery box
https://www.amazon.com/dp/B00EOX2OKS...ing=UTF8&psc=1
Switch
https://www.amazon.com/dp/B09F2WLFHM...ing=UTF8&psc=1
Inline fuse, 7A
https://www.amazon.com/dp/B071ZZNTXY...QB2CJQYB?psc=1
Linear Mode
