Hi all
Just recently got my system approved for grid feed (this week)
I'm running a multiplus II 48/5000, with an 250/100 mppt via ve. direct, cerbo GX, 13kwh of usable storage 14S lithium with Batrium BMS, 6.2kwp PV
My problem seem to be when at 100% SoC the system starts discharging the battery (3700w) into grid (3700w allowed in grid feed-in) and shutting down the MPPT until it reaches 97% SoC then MPPT kicks back in and we are charging batteries to 100% again. This cycle repeats as you see in the screen dumps.
I've managed to stop this behavior by disabling DVCC, then it all acts as "Intended" I would assume. Not discharging the batteries anymore at least. But it is my understanding that I want DVCC to be enabled? BMS is running via CAN to GX.
In ESS menu I've set it to Battery life not optimized.
I find this very strange, also I noticed when it's doing it, if I go into the BMS menu on gx and into parameters it has a Charge Voltage Limit (CVL) set to 37.1v, the max CVL is normally 56.0v, but changes to 37.1v when discharging to grid. If I then go into my BMS settings, there are no settings in there that is set to 37.1v, also it wont drain the batteries down to 37.1v but only 97% SoC.
Are there any settings in the ESS setup i've missed? Only have ESS as assistant.
I hope some of you can help me out
Thank you
From Rasmus