Interesting. I apparently have V3.1.1021.this one
Just for kicks, what happens if you switch your phone to English? I read here that some apps don't work correctly with some languages. Might be worth a try to get it going.
Interesting. I apparently have V3.1.1021.this one
Not that I have ever heard. It should work when it is happy with the cell voltages.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 makes perfect sense, 160ma is like trying to keep the grand canyon flowing with a garden hose.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?
View attachment 120083
this is when charging with 4+ kW
remember, BMS is bypassed, only bal.function is working.
You need to top balance or get a high current active balance.no, cells were all at 3.2V
It looks like no. You need to balance them. The JBD BMS is a passive balancer and can only bleed off charge. It does not try to take charge from one cell and put it into another.cells are well balanced - yes or no?
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.This makes perfect sense, 160ma is like trying to keep the grand canyon flowing with a garden hose.
Did you top balance before you assembled?
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.I still don't see any problem with the BMS you have. The issue is that you still need to top balance your cells. Probably the easiest way to do that is by reducing your charge voltage to 57.8v (3.4v per cell) and watching the cells charge. If any start to run above the others by more than 0.03v or so, use a light bulb to bleed charge from that one cell until it is closer to the others. After they all get to 3.4v per cell with nearly zero current, they are full and should be balanced enough to set your charger back how you want it.
It will take some babysitting that way, but you won't have to break your pack to get it done.
You asked if your cells are balanced, and several people said no. Now you say they are well balanced. They are not balanced. Balance won't show until above about 3.45 volts or so.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.
well i just say what i see/measure: balancing happening, and perfectly within the desired 0.02V setting, until approx 3.5V.You asked if your cells are balanced, and several people said no. Now you say they are well balanced. They are not balanced. Balance won't show until above about 3.45 volts or so.
The voltage curve of LFP is too flat to use it as a judge of state of charge. You don't see significant change in voltage until it gets nearly empty or nearly full.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?