I have a Victron 2x Multiplus 5000 paralleled with a set of East and West Facing panels. I have a total of 18*315W Panels East and 12x355W panels West. The East panels are on a 150/100 MPPT and the West panels on a 250/100 MPPT. The Multiplus Firmwares are on 2624459. The CCGX is on 2.33 and the MPPT's are on 1.42
I have 1 x ZBM2 from Redflow and I can feed back into the grid. My problem is that I have long suspected I'm not getting the full available yield from my system due to some throttling of the MPPT's.
I have played with the Grid reference point and I've now seen today that if I set the grid reference point to -2000W I have today actually managed to generate 20% more yield from my East MPPT. (Yesterday the 17th I generated 19.2 kWh and today over 24 kWH). Both mornings were sunny without clouds. Unfortunately it became cloudy in the afternoon and the West MPPT was not observed so I couldn't see the full impact on the total system in the afternoon.
I have attached the graph from the Portal here for the last 3 days and you can clearly see that when my West MPPT is starting to receive sunlight it is starting to throttle back the East MPPT. However, today when I put the grid reference point to -2000W at about 7:30am I almost had a clean PV distribution curve on my East MPPT.
I also have taken the last 7 day's hourly profile and plotted that onto each other and you can clearly see the massive difference that I've seen today.
And for the full system:
I honestly believe that for some reason ESS is not allowing the full potential of feedback to happen and really would appreciate if someone at Victron could investigate the cause of this. A loss of 20% is quite substantial and I dont' want to have to every day set my system manually into a negative grid reference point to get the max from my system.
Any thoughts on this issue?