Your situation is different. You have batteries in series.I am getting the same issue on my 6kw Growatt, w/ 4 206ah Lithium SOKs wired in series to 48v. One of the batteries is reading a bit high compared to the rest (13.5 vs. 13.3 on the rest of the batteries), but once the inverter reads 55.2, the system shuts down, cutting off all power, and then if I wasn't home, it would turn on and off all day. I can't really leave my system alone until I figure this out.
I did have one bad BMS but I replaced that and all others are fine, and I have Victron battery balancers which are supposed to help with the balancing of the load and charge. But so far, I haven't had success getting the inverter to stop shutting down once the batteries are charged....
Let me know if you find anything out and i'll do the same.
Thanks. I just did that, got all 4 to ~13.3v ready by volt meter. So I was hoping it wouldn't do this on a day with full sun. Now I am looking into my Growatt settings: maybe adjust the float and charge settings from 57.4 to 55.5 charge, 55.0 float. I also read that lithium batteries can work on US2 or on USE in the 05 setting. Know anything about these settings? Thanks Tim!Your situation is different. You have batteries in series.
You need to separate them and fully charge them separately.
This process will have to be repeated every few months. Because BMS controlled batteries in series will drift away from each other.
Not high enough for them to balance themselves.Thanks. I just did that, got all 4 to ~13.3v ready by volt meter.
Also too low for balancing.maybe adjust the float and charge settings from 57.4 to 55.5 charge, 55.0 float.
Thanks again. I do have 2 bench chargers that charge at 14.6 (I think) and once they read "Full or charged", I take the leads off and the battery reads 13.4. I was thinking this seemed low! Maybe I should leave the bench chargers on longer, idk? I have 4, SOK 206ah in series and they seem to not hold their charge that long (my off grid system averages 500 watts/hr for 24 hrs) and this system doesn't last through the night. Anyways, thanks Tim and Happy New YearNot high enough for them to balance themselves.
Need to get above 13,8v minimum. I would recommend 14.4v for balancing.
And hold them there until amperage reduces to below 5 amps.
Also too low for balancing.
Balancing should begin above 3.45v per cell. (55.2v)
I float at 56v. But you can get by with 55.6v.
YesMaybe I should leave the bench chargers on longer
Sorry, I missed this question.I also read that lithium batteries can work on US2 or on USE in the 05 setting. Know anything about these settings?
NoIn setting 05 of the Growatt, USE is for when there IS communication between the BMS and the inverter.
Your situation is different. You have batteries in series.
You need to separate them and fully charge them separately.
This process will have to be repeated every few months. Because BMS controlled batteries in series will drift away from each other.
In setting 05 of the Growatt, USE is for when there IS communication between the BMS and the inverter.
Which setting (LI, US2 or USE? It would seem I would want the BMS's in each battery communicating witheach other and the inverter. In that case, "LI 05"?No
It's for when you don't.
You are referring to the setting of "LI".
Oops, didn't see you answered earlier up top ("USE"). Thanks again! Hope this tinkering can get this system running properly! I have some rainy days ahead so I will charge them again individually with generator power (I am 100% off grid). Cheers~Which setting (LI, US2 or USE? It would seem I would want the BMS's in each battery communicating witheach other and the inverter. In that case, "LI 05"?
Therefore, I will be on USE with the float settings suggested above. Then individually charge each battery again and fingers (eyes and toes) crossed that will set them up..PS: You can't use communications with series connected BMS's.
US2 is recommended when using lithium batteries without the communication cable.............according to the manual.LI , is for BMS communications.
Use , is for non communications.
Use2 , is not recommended for anything.
I am new to this but I have the same inverter and I had the same problem. I kept getting an overcharge error/fault (03). After the battery got full, I would get the beeping and the over voltage error and the panels would get disconnected from the battery, and the cycle would keep repeating itself unless I turned off the pv input. My guess is the BMS in the battery was turning off the panels to stop them from overcharging the battery. I searched this forum and a guy suggested changing the charging settings. It made sense because the fault is an overcharge fault so I expect that something was too high. I don't remember his name but he suggested changing settings 19, 20, and 21. This is what worked for me.My Growatt SPF 6000T DVM is repetitively shutting off solar input, beeping and then trying again. Seems to happen when the battery voltage gets to about 55.8V,100% SOC on my lifepo pack. I have all the parameters set using the recommended settings and I can't get it to stop this behavor. I am losing significant solar input because of this issue.
Any ideas are welcome.
Dave
But not recommended by anyone here. Because it limits what settings you can adjust.US2 is recommended when using lithium batteries without the communication cable.............according to the manual.
