I've been looking around for answers but can't find the specific answer to my problem. I have the Multiplus 500/48/70-100, Blue solar 150/70 connected to 4 x 183AH 12V Deka Gel batteries. The system is setup in ESS, optimised mode with battery life and a SoC of 70%. I've also set the 'limit inverter' function to a max of 3200W in the ESS setting which should be well within the power margin of the inverter. The batteries are connected with 50mm2 cables of 1.5m.
During the day there is no problem usually, but at the end of the day (close to the SoC) limit the inverter trips when using >3500W for some reason and tells me that the battery is low. First of all the inverter should not be doing anything above 3500W and should supplement battery power with grid power above this point. Secondly, the notification of the alarm tells me that the battery power is around 45V but after the system restarts again I get a reading of 49V, also in VRM.
I am wondering what the problem is. I also have a 156A DC breaker in between the battery banks which sometimes trips, meaning the inverter does draw far above 3200W which at 48V = 67A.
Hope you guys can help me out!