July 9, 20215 yr Hi All. I recently completed a 7,2kW Kodak installation, with a 5X Pylontech US3000C battery backup. Batteries are connected in parallel using Pylontech lead out cables, to a common busbar, and from there to the battery fuse and then inverter with a common cable. I am however having issues with the master battery, that keeps tripping on an over voltage protection fault( other batteries continue functioning normally). Have updated firmware to V1.9 on all batteries and yet problem persists. Sent battery back to supplier, they tested it and it according to them, is not faulty. System has been running without issue for 2 weeks without this battery. Were could a possible other fault be, as the supplier maintains battery is fine. Also tested amps under load, master battery was read about 8A whilst other batteries were balanced at about 13A, so that seems to me to be a battery fault, correct?
July 9, 20215 yr Hi @Irrisol I'm not saying there is an issue with your connections but most pylontech setups don't need busbars. They usually look like this. Edited July 9, 20215 yr by Buyeye Added picture.
July 9, 20215 yr It certainly sounds like it is the battery to me. If the master module/battery was supplying a higher current it would imply that there is less resistance in it's current path and the overvoltage might be plausible but you are seeing the reverse which doesn't make sense. I assume if you switch master settings and module position, keeping everything else the same, the same module continues to have a problem?
July 9, 20215 yr 5 hours ago, Irrisol said: Hi All. I recently completed a 7,2kW Kodak installation, with a 5X Pylontech US3000C battery backup. Batteries are connected in parallel using Pylontech lead out cables, to a common busbar, and from there to the battery fuse and then inverter with a common cable. I am however having issues with the master battery, that keeps tripping on an over voltage protection fault( other batteries continue functioning normally). Have updated firmware to V1.9 on all batteries and yet problem persists. Sent battery back to supplier, they tested it and it according to them, is not faulty. System has been running without issue for 2 weeks without this battery. Were could a possible other fault be, as the supplier maintains battery is fine. Also tested amps under load, master battery was read about 8A whilst other batteries were balanced at about 13A, so that seems to me to be a battery fault, correct? If you suspect the issue to be with the master battery, trying swapping that master, make it a slave and choose different battery to be master and see if the other battery will also trip. If it trips, then the issue is with your inverters settings. Maybe the inverter setting doesn't allow for five batteries I would also go further and disconnect one of the good batteries and use the same master with three batteries, bank of four batteries, and see if the same problem will occur Edited July 9, 20215 yr by hoohloc spelling
July 9, 20215 yr What inverter are you using? and is your inverter connected to the Master battery? Are you able to see what the charging params are on the inverter?
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