Search results

well i just say what i see/measure: balancing happening, and perfectly within the desired 0.02V setting, until approx 3.5V. is there a technical reason cells start to drift at this V, is it common?

oh they're well balanced until approx 3.5V, then they start to drift apart. i thought if perhaps 160mA bal.current is a tad weak now, it'll only be worse if we more than double PV-power.

what BMS would you guys recommend? batt.bank is 15kWh, PV-input 8kWp. now. but in 2023 we want to increase to approx 20kWp in order to also charge EVs. battery is more of a buffer, and to keep d lights on at night; except a stove for 1 hour, no high-W gadgets depend on it.

yes, V-meter & BMS agree. cells are within 0.02V most of d time, only when >58.5V do they start to drift

thanx - would be surely better :) thing is i have to get going what i have here& now, surely can be done. it's not like JBDs are totally useless, is it? i understand it may not be ideal in my situation. balancing issue is not what keeps it from switching on i assume, as at times -most of d...

no, cells were all at 3.2V

but another issue appeared... approaching cutoff V, cell-V starts to drift apart. as if BMS isn't powerful enough to keep cells balanced. specs say bal.current is 160mA - does this make sense? this is when charging with 4+ kW remember, BMS is bypassed, only bal.function is working.

no, we have overcome that

we tried in spanish, english, german, no change. apart from that, friends have exactly same set-up (bms, batts, invertor) they are struggling with same problem; bms doesn't connect. i heard rumours bms needs to be briefly connected to 60+ volts to start it up - any truth in that?

this one

i did indeed. also 17 cells are now displayed, with correct V. "only" no output :(

i have a JBD 7S-20S 200A BMS, i´d say 20-series. 17S. above shown connection works for me, IF i connect redundant 3 bal.wires to 15th cell (3rd last) and NOT to 14th. in which case 20S will be displayed. my problem is i can´t activate discharge current, can´t shift discharge button to d right...