fell victim to the scam
so in the fall I saw 310/320 cells go on sale so I decided to order another 4 to make my second battery. problem being is this was a company that never sent the cells out and the delivery date of 3 d...
Forum Discussion
StirCrazy wrote:Our JBD 200a BMS has a passive balancer. Most of the popular DIY-type BMS's (like JBD and Daly), along with most budget lifepo4 batteries sold on Amazon use passive balancers. Unfortunately, they're inefficient ("burn" vs. move current), slow (50-150ma) and sometimes only work when there's charge current present. It can take days to resolve significant imbalances.
. . . which active balancer did you go with, did your BMS not have active balancing?
Steve
We purchased a 4S Heltec active balancer and only switch it on to resolve larger imbalances. Specs say it can move up to 5a (5000ma). We've seen it resolve a 200-250mv delta down to 5mv within an hour or two. Pretty quick. The only time we find the need to switch on the Heltec is after we've done repeated, high c discharges from 100% to 10%. We may do these deep discharges a couple times a day during the summer when we run the a/c during breaks on the road (use a dc2dc to charge). With this kind of abuse, the cells tend to drift a bit. We charge the cells to near 100%, then turn on the Heltec. Everything resolves to <5mv in <30 min. (it more or less accomplishes a top-balance).
