Hi,
I'm currently testing a new ESS installation based on Victron Mutiplus II 8 kVA + Cerbo GX + 6x Pylontech US2000C.
My PV installation works since 2019: Fronius Primo 6 kVA + 6700 Wc of LG solar pannels.
I would like to setup a classic AC coupling ESS (grid connected, with backup).
I'm based in France.
IP connectivity is OK. I have a VRM account and can see the different sub-systems.
MODBUS TCP connection with the Fronius is OK. I can see correct inverter output power.
BMS CAN connection with Pylontech master is OK. I can see SOC and battery state (idle/charging/discharging).
I used VRM + VE Configure to setup the ESS & battery parameters.
For the moment, I'm testing the system without grid:
- AC IN not connected
- AC OUT1 connected to main switch board of the house + Fronius Primo inverter
- SOC battery > 50%
When I start the system early in the morning, the Victron inverter starts discharging the battery and powers the house.
Everything is fine. My EM112 meter indicates correct parameters (230 V, 50.0 Hz...)
When the sun rises, the Fronius synchronizes and starts injection.
After a while, production is high enough and battery flow switches to idle, then charging...
After few minutes, the Victron Multiplus starts to do some strange noises / vibrations and I observe a lot of malfunctions in the house:
- LED bulbes blinking
- oven clock goes faster !
- UPS inverter (that protect routers) stops and trigs an alarm
- EM112 meter indicates crazy frequency of 60 or 80 Hz during few seconds, then back to 50.0 Hz...
I decided to use my digital oscilloscope to display the 50 Hz sinus provided by the Victron:
the result is big glitch on the output, matching the noisy events. (see pictures)
Oscilloscope captures: yellow = VRMS, blue = AC OUT current
- 3-pv-low-discharging-high.PNG : PV low, battery flow = discharging (high) --> VRMS & IRMS in phase (ok)
- 4-pv-high-charging-high-ok.PNG : PV high, battery flow = charging --> VRMS & IRMS opposite phase (ok)
- 5-pv-high-charging-high-glitch.PNG : PV high, battery flow = charging --> glitch
Should it be a configuration problem ? or a hardware issue ?
Maybe an incompatibility between the Multiplus II and the Fronius Primo ?
Can you suggest me some additionnal tests to do ? Or advices ?
I'm a bit disappointed...
I have updated the Victron firmware to last version last week (v497), but issue is still there...
Thanks a lot for your help