rv drop in replacement battery

[shauncornish]

rv drop in replacement battery, I have been trolling LiFePO4 battery youtube and forums for about a year. I'm old and on a fixed income so bear with me please. I'm looking for some LiFePO4 batteries that will fit my slide out battery tray in my class C and can be removed to extend the usable time of my bluetti EB70 encase of a power outage. Thing of a weize 12v 100ah Will Prowse did a tear down and liked it so with 2 I could run my CPAP and a little entertainment for and recharge with a generator or solar when I get to it. maybe some recommendations or some information that may help
Thank you in advance
Shaun

 

[HRTKD]

If your consumption is under 200Ah then those batteries will work. Most off-the-shelf batteries are sized to fit where a lead acid battery did. But it's always good to check the dimensions. If you camp in temperatures under 32°F you'll have to be careful to not charge. LiFePO4 doesn't like to be charged under 32 °F.

To avoid buying not enough battery, consider doing a power audit. Below is a link to spreadsheet in the Resources section of the forum that will help you with the audit.

System Energy Audit and Sizing Spread Sheet

To get the spreadsheet, click on the orange Button in the upper right of this page. This sheet is intended to help you plan your system. Fill it out down to the last decimal place, look at the results..... and then make your best guess;)...

diysolarforum.com

 

[shauncornish]

thank you for your reply HRTKD, I went with the weize 100 AH x 2 they have low temp charging protection per Will Prowse video. $330/per and a perfect fit just need to change out my converter not to bad another $250. I'm at just under a grand. Could I bother you with one more question ? I have an auxiliary battery start on my class C if the engine battery is low or dead do you think there would be a problem using it with the LiFepo ? again thanks maybe we'll see you on the road

Shaun

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[Bluedog225]

I thought the problem with slipping a lithium battery into an RV was that the built-in sketchy RV charging system will not charge the lithium correctly.

 

[shauncornish]

Blue dog you were correct ! sizes are all over the place. but the weize were the correct size for the battery slide in my class C.
I have a spot that I could put a 1000 Amp hour's of batteries in but not cost effective, I don't need it and don't want to rewire that much and i'm older and it would out live me and the RV.
Yes it was the RV house converter. I have a new one coming that will do LiFePO looks like an hour of work at most.
But the question came into my head about the auxiliary battery start. I under stand that this is a solar forum but "dang" where else would you ask this question.
sorry if this sounds harsh don't mean it that way just explaining my thought's r
thank for your reply and would be grateful for any thoughts on the other question
Thanks
Shaun
PS (edit) looks like the bms will only support 300 amps for 3 sec. so at 600+ cold cranking amps for my chevy im
not holding out much hope.

 

[HRTKD]

I have an auxiliary battery start on my class C if the engine battery is low or dead do you think there would be a problem using it with the LiFepo ? again thanks maybe we'll see you on the road

A direct connection between the two may not be good. A starter can draw way more amps than the BMS is rated for.

If you were to put in a DC-DC charger from the LiFePO4 to the starter battery to keep the starter battery charged, that's OK. But you're going to want a charge source (solar, shore power, generator) that the DC-DC charger can make use of.