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New Camper battery build

StirCrazy
Nomad III
Nomad III

so as of today, I don't have a Battery in my camper.  I gave my 280Ah home built one to a friend for his camper.  this isn't an issue as I bought 4 new cells in september to build a new battery, I have just been working so much overtime at work I havent had time to do it yet.  

I went with the eve 304AH cells that have the new two bolt termanals and a few other advantages including increased cycle life, lower operating temprature and so one..   since I have bouhgt them the price has droped from 134.00 US per cell to 109.00 and thats buying from a US based store, if you want to buy direct from china they are down to 84ish bucks a cell.  the price of LiFePO4 cells has been steadily driping and expected to drop more in the next little while.  

anyways on to the build.  I dusted off the cells this morning, conected them all in parallel and set them on the charger at 3.55V to start the balancing.  the cell voltage was 3.245V on all cells after sitting since september when they arived at 3.278V.  once the cells are at 3.55V and 0A I change it to 3.65V and sit and watch so I can disconect it when the amprage hits 0.  

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2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100
7 REPLIES 7

StirCrazy
Nomad III
Nomad III

well, the cells are up to 3.36V now.  getting closer..  when I did some thinking on why its taking so long, I am putting over 1100AH into the cells at a 4 amp charge rate....  

2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100

StirCrazy
Nomad III
Nomad III

not a lot happening right now, Im working 6 on 2 off shifts right now and my bentch top power supply is only putting out 3.4amps at 3.65V getting close to top ballanced though.  I think the 5 cells were close to 3.34V when I unhooked the charger to go to work.  

2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100

StirCrazy
Nomad III
Nomad III

due to my new power supplys low output, not sure if somthing is wrong with it or I am missing something, but it has been charging for 24 hours so far and back on this morning... hopefully I'll have it close to full today...  Should have just installed it in the camper and set the charge controler to 3.50V to bulk charge it in hindsight.  

2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100

well after 40 hours of charging I am at 75%.  back to work today so next days off I'll finish charging I guess.  

2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100

StirCrazy
Nomad III
Nomad III

Couple pics from when I got the cells

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2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100

Where do you buy your cells from?  I want to build my own battery pack and need to know where to get the parts. 

I got these ones from 18650batterystore.com for some one based in the US it is a great place to buy from.  for canada, it ends up being a bit expensive with the shipping and exchange and duty at the boarder, but I had gotten ripped off a few times and luckily got my money back and wanted a north amaerican sourse.  there is a chinese source that I am going to order from next time, I just have to look them up yet, but lots of people have had good luck with them for a while now but the shipping is obviously a lot longer.  18650 did treat me good though, I had one cell that was dammaged some where before it was shipped (just a slight dint and scratch) but when I stated I paid premuim money (at the time) for grade A undammaged cells, they agreed and sent me another cell to replace it.  thats why there is 5 cells balancing.  

you can order pretty much everything, the cells, bms, seperators, klapton tape and the case if they are in stock yet from 18650.

 

2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100