Skubbe

Thanks, I have contacted Pylontech to try and figure out what my options are.

Yip, sorry. Heading should have said SOC not SOH. Do you perhaps know ho to check the cell voltages without access to a cable a specific software? Or should I rather just take the battery to Segen and have them test it? Regards

There appears to be a similar issue on the charging side. This morning while charging consistently at 185W between 00:00 and 05:50 the SOC% climb consistently from 20% to 53%, but then while actually discharging from 05:50 to 06:00 the SOC% jumped from 53% to 97%.

Hi Guys My current setup is 1x Pylontech US3000 battery (SOH 87%, BMS Version 0), a Goodwe 5048D-ES inverter and 16x 400W solar panels. There appears to be a problem with how my inverter reads or measures my battery's SOC%, or how the BMS communicates it to the inverter. As an example, on 8 September I consistently used about 510W of my battery between 18:00 and 19:55. Between 18:15 to 19:40 the battery SOC% declined from 100% to 76% which is an average of 1% every 3.5 minutes. But then between 19:40 to 20:00, while still using only about 510W of battery power, my SOC% drops from 76% to 20% which is an average of 2.8% every minute even though the battery consumption remained approximately the same. I have tried a reset of the battery and the inverter by switching everything off - battery, panels, grid - and then restarting again in the same order - battery, panels, grid - but it does not seem to fix the problem. Goodwe has now installed new firmware but that does also not seem to fix the problem. I don't have access to a cable and software to connect to the battery to upgrade any firmware or make changes to the battery so that is still the same as when it was installed in 2020. Has anyone had a similar issue, and if so how, if at all, did you manage to sort the issue out?

Hi guys, thanks for the thread thus far, it already helped a lot for what I am trying to achieve on my system. I have a GW5048D-ES inverter, one Pylontech US3000 battery and 16 x 400W Canadian Solar panels (one string of 8 facing North and one string of 8 facing West). With a DOD On-Grid setting of only 9% and a DOD Off-Grid setting of 79%, my essential load set-up is enough to get me through one late afternoon / evening 2,5 hour loadshedding session and 75% through a subsequent early morning 2,5 hour loadshedding session. However, if the early morning session is the 04:00 to 06:30 session, I find that my system is switching on and off repeatedly when it starts getting some PV generation (I think), but then the PV generation is not necessarily enough and the system switches off again. Some mornings this can happen in excess of 5 times before the Eskom grid is restored. This can’t be good for anything. The first preference would have been if there was a setting where you can tell the system to only switch back on again once the battery is charged to, argument’s sake, 50% (or when Eskom is back up) but I can’t seem to find a setting like this, so if anyone know of such a setting please let me know? The second option is to use the Eco Mode to have Eskom charge the battery between the two loadshedding sessions. This is where this thread was very helpful thus far. However, I don’t want the grid to charge the battery 100% full, using expensive Eskom power. I want to ideally limit it to 50% SOC. I thought that is what the “Charge cut-off SOC” setting in the Eco Mode charging time periods would do, but even if I set that to 50% the grid still charges the battery to about 88% SOC before it stops charging the battery. Not sure where it gets the 88% stop point from. Any suggestions on whether it is possible to limit to what level the battery should be charged using Eskom power? Obviously, the last option would be to play around with the rated power %, but currently, depending on the stage of loadshedding, the timing between my evening session and my morning session can be as little as 1,5 hours or as much as 3,5 hours so without tampering with the rated power % every now and again, catering for the 1,5 hour timing will result in a significantly “over charge” during the 3,5 hour timing and vice versa. Any suggestions and comments would be highly appreciated.