Recent content by pohjeremy

One-time digression.. U know, that company claims 3.357V to 100% SOC and charging current =<3.650V. Others say LFPs accommodates past 4V bursts w/o issues. Guess I'll never really know. Maybe it's a different chemistry but I've got a feeling all LFPs are nearly identical.. :?:

Hey, thanks!!! Will seriously consider that. :)

Yes...I should get a basic BMS.

Hi all, My distaste for BMSes has ended. Looking for an affordable one (from China, not much of a choice). Need advice. 1st timer...help!! :oops: I've newly acquired 36 x 74Ah LFP cells for a 32s1p arrangement. 4 spares. E-motorbike DIY. Battery + BMS selection stage. All cells are in the...

Thanks, dnmun.

By the way, what wire gauge would anyone recommend for an 135kg e-bike, 40A (estimated average), occasionally bursting to 140A for <30s..? The hub motor's phase wires are 7ga (2ft total). I was thinking 9ga for cells in series (3ft total) and 8ga (1ft total) for cells<--->controller..? The...

Sorry, forgot charging details. Charger: 113VDC, 6A. Voltmeters are +0.03xV (So 3.34 = 3.31V). Near 10mA each. The 3.34V base was after a test charge for about 30 seconds. The actual OCV was 3.286V(multi-meter)-- all 32 cells. They had been balanced in parallel for 48hrs. Bulk charging was...

Thanks!! New Topic: How does one ensure a PRC made BMS is reliable and won't ruin the whole ($7000) set? e.g. Smoked MOSFET, Wrong ga, 2nd-hand parts, inauthentic parts...never-ending, darn. This is the ONLY 2.5-3.65V, 32s, 140 - 150A, BMS 'reseller' whom I can access to, that is affordable...

On it, pal...I'll try doing it 6-hrly...thanks!!

Cell 27 does not. It self-discharges more than 5 times the rate relative to the other 35. And I trust my stringent test conditions. This might not correspond to what guru-member 'liveforphysics' earlier elucidated: Now, if one engineer says a 15-mile suspension bridge will buckle and another...

Hi wb9k, Thanks a bunch! :)

Hi... 15-day test done. You think 35 cells are ok for a 32s selection? And wld 30-day be better? Thanks! Ok...I'll figure out how when assembled. The mV on cell 27 is suspect and CALB may send me a replacement. I love the cells...darn difficult to get them in and are supposed to be premium...

Yes, THANK YOU...I hope you would still.

Can't seem to log CELL DRIFT data as yet nor do I know how to. Perhaps someone can illuminate. I do not want a BMS due to the lack of space and trust for reliability...those small parts; Lack of time to test several (e-bike/motorbike-sized) BMSes, then settle for a trusted vendor...at least in...

The attached was bought from some Chinese company (details on last page of .pdf), assembled by another independent Chinese battery pack assembly technician (who called them for assembly instructions 14 months ago) ; he had never installed that kind of BMS before, just many of the simpler...