Hi Everyone,
I have logged two other questions on the same issue and has not resolved the issue. I am again asking the question should someone has seen this before. Currently the local wholesaler and Victron is attending to the issue, but are not making progress.
https://community.victronenergy.com/questions/77312/3-ph-multiplus-2-erratic-behaviour.html
https://community.victronenergy.com/questions/79818/ess-3-phase-system-feeding-back-to-grid.html
The above is more for background as I will attempt to continue to describe my thoughts below which might help or not.
The three pictures below show some details on the respective phases. As explained previously the issue is most prevalent on L1, less on L2 and absent on L3. I have moved inverters between the phases and the issue remains on L1 thus it doesn't seem to be inverter hardware related. Could still be software or coding, they have however all been upgraded to the latest version.
The wholesaler has also reconfigured the system from a software perspective and the issue remained.
I will start below with L3, which I believe is working correctly:
As can be seen on the System - Grid graph the L3 line stays above feed-in to the grid and the average current on the AC Input Voltage and Currrent - Phase 3 graph is around -8A. The load on this phase at the time is approximately 1.8kW and although quite noisy is relative consistent when looking and the calculated non-critical load side throughout the period that the element is on.
On the opposite side the L1 phase reacts completely different as per below:
During the same period, you can now see that L1 pushes power back onto the grid. The AC Consumption calculation becomes very erratic at this stage and seemingly due to the system trying to calculate the additional load on this phase and significantly overshoot. The AC Input current averages at approximately -16A during the period which is double what is seen on the other two phases.
During this period on the remote console the system seems to jump as can be seen on the peaks of the AC consumption and then slowly regulate back to the required power and seemingly jump again as soon as it gets back to the correct power. IT seems that there is a calculation error as soon as it gets back to balance that makes the inverter over-react to try and accommodate these calculated excessive loads. This then just push back onto the grid until it can then correct itself over a few minutes.
Any help, suggestions or requests for more information would be appreciated and accommodated. At this stage we are not making progress with the local support and it seems their next option would be to strip out the whole system to take back to their office to test.