I operate a Victron system with Multiplus 2 and battery on a single phase with DESS. The goal of the system is to store energy in the battery during times of low energy prices and consume from it during high prices. The Multiplus is connected to phase 1. The DESS is running in green mode, and I do not receive any money for feeding into the grid.
Now to my question: The attached VRM chart shows a high proportion of “Battery to Grid” between 7 PM and 11 PM, although “Battery to Consumption” was actually planned by the DESS. The chart from the meter, on the other hand, shows that the consumption from the battery was correctly compensated, as the green line oscillates around the zero line. The two charts do not match. Shouldn’t the VRM energy chart display “battery to consumption” instead of “battery to grid”?
This looks like multiphase regulation is set to total of all phases, this means the system injects on phase 1 to compensate the other phases and keep the grid meter from the power company on zero.
Exactly. This is a single-phase ESS running in a three-phase system. My question is about what I believe is a misclassification under “Battery to Grid.”
Here’s an example to illustrate: each of the three phases has a 100 W load. The ESS compensates on phase 1 with –300 W so that the total across all three phases is zero. That part works as intended.
After one hour of operation, I would expect to see 300 Wh under “Battery to Consumption,” since I effectively drew 300 Wh from the battery.
My theory, however, is that of those 300 Wh supplied by the battery, only 100 Wh show up as “Battery to Consumption” (because the current is injected into L1, where only 100 Wh needed to be compensated). The remaining 200 Wh are instead logged as “Battery to Grid.”
