John, I built a similar pack using 4s CALB SE100AH. You'd probably get CA100AH. You could go the Arduino route - you can probably even find some BMS code - or for not much money, you could buy a simple 4s BMS. I bought one from Electric Car Parts Co. for around $50 (iirc) that does high and low voltage cutoff and short protection for up to a 40A load/charge. I chose a BMS that does not balance, as I wanted to bottom balance my pack for propulsion. The hardware BMS does not let you tweak the shutdown limits like software does, so you have to know what you want when purchasing.
These cells will charge/discharge at 1C if you manage their temperature. My pack discharges at up to 40A, and charges from solar at up to 6A. It's been great for a year and a half so far as a propulsion bank.
You may want to consider balancing modules if you plan to always charge fully. In that case, your pack will be top balanced, which makes sense for house batteries that normally don't get deeply discharged.
I wired in little digital volt meters with push buttons across each cell so I could see individual cell voltages at a glance. That way I can see how similar each cell's behaviour is to the others at different SOC. I think they were under $2 each.
I found an ebook that discusses building your own Lithium battery packs. It has some useful info. https://www.amazon.ca/DIY-Lithium-Batteries-Build-Battery/dp/0989906701. There are also some great blogs and great resources at EVTV and diyelectriccar.com, among other places.
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Posted by: cpcanoesailor@yahoo.ca
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