I BOUGHT MY TWO CUSTOMIZED LIFEPO4 PACKS FROM CHINA. THE BMS WAS ONLY 40A CONTINUOUS, I HAD TO CHANGE FOR THE FOLLOWING LINK.
THREE YEARS NOW, NO PROBLEM… THE BMS DOES OUTPUT 150 AMPS CONTINOUS AND MORE IN PEAK
HOPE IT CAN HELP
RGDS
FRED
On Sunday, September 16, 2018, 2:17:44 PM GMT+12, 'james@deny.org' james@deny.org [electricboats] <electricboats@yahoogroups.com> wrote:
I do have a BMS that does active balancing. And I would recommend a BMS that does active balancing. Especially if you want an install it and forget it battery. But if you do go with a BMS that only monitors the battery, if as you say you keep the cell between 2.5 and 3.5, on a well balanced battery pack, then I doubt you would have to rebalance very often, maybe never. But you might, with either top or bottom balancing both are a bit time consuming. By not having a BMS that balances, you are by default the "active balancer"
I will say I don't recommend the type of LiFePo BMS that have a little circuit board attached to each cell. The chance of them short circuiting is simply to great.
If I was buying a BMS today, I would probable go with the Orion BMS.
But that would not make a ton of financial sense for the original poster as he was only talking about a $400 dollar 12v 100ah pack. Which is why I wanted to give good advise for his personal situation.
To be more general, if your battery pack cost more then $2000 bucks I would highly recommend the peace of mind an active balancing BMS would give you. Under that cost, a good BMS might not be worth the extra cost. But you will need to preform a bit of semi-yearly maintenance instead.
On Sep 15, 2018, at 9:52 AM, clh5_98@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
James (not Lamden),are you proposing that a BMS is not necessary for a Lithium pack. I have heard of this being done. Even one distributor of CALB cells has a white paper discussing this. Essentially they bottom balance the cells individually before hooking them in series and then just never charge them beyond 3.5 VPC, or let them go below, I think 2.5 VPC. Seems like, with periodic cell monitoring like you mentioned and a fully configurable, high quality charge that going BMS less is possible. Thoughts anyone?Chris
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Posted by: Berlouin Fred <berlouin@yahoo.com>
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