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
otrfun wrote:StirCrazy wrote:I wouldn't mind being wrong. Not gonna complain if our JBD indeed has an active balancer--lol! Active would make it a more efficient (moving current vs. burning it). Unfortunately, either way, it's still very slow. So, still need the Heltec. Let me know . . .otrfun wrote:interesting, Im pritty sure the JBD I goty has active ballancing but now Im going to have to double check.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).
ya and I know it says it has to be at a spicific voltage to do its balancing... I have to find the littiture, been busy tiling around the fireplace these days off.
just looked it up, cant find out the info what does this look like to you? its a small curent but not sure that means anything.
"Balanced turn-on voltage 3.350 3.400 3.450 V
Balanced turn-on voltage difference 15 M V
Equilibrium mode
Equilibrium current 40 60 M A
Is this somthing like the one you have?
balancer
