Originally Posted by pjshier
For charging 32F to 131F. Thinking mostly of the lower end: will the front compartment of our 27FBT - maybe with some modification - keep the batteries above 32 if the outside temp drops below overnight for several hours? Assuming the front compartment is closed, of course.
If not - will be planning an install of 2 100ah LiFePo units under one the curb-side twin in the interior-accessible storage locker.
Hi, hereís our recent experience with exactly this issue.
Our 4 100 AH lithium batteries (BB, unheated) are located in the front compartment of our 27FBT.
Earlier this week we had a hard freeze with a low of 24 degrees overnight (it was 30 degrees at 8:00 pm at the start of the night, so Iíd estimate we were below freezing for 12 hours or more).
We had the furnace running at 55 inside, along with a Dyson hot/cold fan to supplement, keeping the front bedroom at about 58.
That night, the temperature in the front compartment did not go below 42 degrees.
We have not added any special insulation or heaters for that compartment, as we currently have no plans to camp in conditions much colder than what I just described.
However, our charger/inverter is mounted in the front curbside exterior compartment, and vents partially into the front exterior compartment, and this may have helped the front compartment maintain heat.
I hope that data point helps as you consider your system.