Basics of Lithium conversion... I'm lost!

StirCrazy wrote:
seams Pianotuna keeps mising the fact that while his batteries will work at -40, they only have 40% of there original capacity, but he doesnt own any so he wouldnt know.

so if you want to do 800 AH of availble capacity you will need 18? 100 amp hour Sio2 batteries, do you have the space to store that? for LiFePo4 all I need is three 6" x 8" x 11" 280 AH batteries to have 840AH of usable capacity available, plus because of the smaller size and such it is condusive to tuck into a heated area so I don't have to worry about any capacity loss due to temprature. a lot of people seam to think it is some magic but they are simple to use and charge.

as for the plane in the millitary or comercial, the reason is largly based of previous versions of Li that were prone to thermal runaway and could cause fires, not because of the capacity or anything else. LFP is not suseptable to that as perviouse versions like nickel hydride and other varients.

I notice every day that people who have never used LFP keep posting scare tactics to try prove that SiO2 is better even though they have no experiacnce with it and are going off sales sheets.... but oh well..

Steve

Interesting point about capacity at low temperatures. It would be worth doing an energy analysis to see if you would be better to use some energy to heat the batteries, so that you can get their rated capacity, or two leave them unheated and only be able to use 40% of their rated capacity.

If the camper will be heated anyway with propane, then it almost certainly makes sense to heat the batteries. Either move them inside, or given that seems not to be a preferred option, run a heat duct to the battery compartment and insulate the outside walls. If you need to use electricity to heat the batteries, it is less clear what the best option would be, but certainly worth considering. The other big advantage is that you could then use any batteries, and save a bunch of money.