Hello. I built my first ESS the past few days, but having a issue with the system not wanting to drain the batteries to my configured lower limit SoC. My setup consists of:
1x MG Master LV 600A - Connected to Cerbo using VE.Can
2x MG 5000 Wh 24V 200Ah batteries in series, thus 48V (=10 kWh)
1x Victron Cerbo GX + GX Touch
1x Victron MultiPlus-II 48/5000-70/50 - AC Coupled to grid on AC-in. Outputs are unused.
1x SolarEdge Inverter - AC Coupled to the grid
1x EM24 Ethernet grid meter
The issues are:
- At basically any SoC, while discharging, the low batt warning starts to blink.
- At around 60% SoC inverter stops and low batt is continuously on
I noticed a few things:
- In VE.Configure I can't select lithium battery system. It only shows Gel/AGM, LiFePo and some other battery types. But not 'Li-Ion' . Should i choose LiFePo ? Or what should i choose?
- The cut-off voltages in the ' Inverter' tab in VE.Configure look okay (37,2V, 43,6V and 43,6V). But from what I understand, those voltages are ignored?
Settings -> ESS -> Mode : Optimized with BatteryLife Settings -> ESS -> Minimum SoC : 10% Settings -> ESS -> Active SOC Limit: 15% Settings -> DVCC -> DVCC: On Settings -> DVCC -> SVS: On Settings -> DVCC -> STS: On Settings -> DVCC -> Temperature sensor: Automatic Settings -> DVCC -> Used Sensor: Lynx Ion BMS 600A on VE.Can Settings -> DVCC -> SCS: On Settings -> DVCC -> SCS Status: Disabled (External control)
Configured battery type:
LiFePo4 with other type BMS (Connected via CAN-Bus)
- Which battery type should I choose in the ESS Assistant?
- What should my sustain voltage me? According tot he battery datasheet the cut-off voltage is 21V. In series that would be 42V. Should I set the sustain voltage to 42V or not?
- Should I enable BatteryLife with MG HE Lithium batteries? Some Internet answers says BatteryLife is not intended to be used with Lithium batteries, yet VE.Configure enables is.
Most important question:
- What should I change to allow the system to discharge to my Minimum SoC = 10%