FJR Colorado
Explorer
OK, so let me as THIS, then: What if I did it the other way around? Has anyone done that?
What I mean is this: My biggest worry is being out somewhere solo and having a dead battery that won't start my vehicle. So, if I get one of these LiFEPO4 jump packs, keep it fully charged while I'm driving. When I get to my campsite, I disconnect the fridge from the vehicle's 12v outlet and plug it into the LIFEPO4 charger. Assuming I get to camp around 4pm, would one of these little chargers be able to run a 41qt fridge until morning? Because if so, I could just connect the fridge to the charger when I'm stopped and then I would be pretty certain my truck would start (since there wouldn't be anything to drain the battery at night) and when I took off the next morning, I could recharge the jump pack via the 12v outlet.
I don't have any experience with LiFEP04 jump packs, but I can tell you that that for normal jump packs with sealed lead acid batteries this should work just fine. I have a remote off-the-grid cabin. I bring a jump pack fully-charged and can run LED lights for several nights. If I run the jump pack down by using it for other things, I can easily charge it while driving using the cable with male cig adapters at each end.
BTW, LED lights really changed things for me. I remember how this process was such a daily chore back in the 90's running incandescent lights at night. I almost CAN'T run the jump pack down with the LED lights. Phenomenal.
Maybe here is the best solution of all for you:
-When driving, run fridge off car
-At night, run it off a bulkier sealed lead acid jump back (runs about $70 at AutoZone)
-Use a lithium small jump pack as your ultimate safeguard should you need a jump (it should hold a charge for 6 months or more and use minimal space)
That way if your car dies, and you exhaust the cheap jump pack overnight with fridge & lights use, you still have an ace up your sleeve...