For about 3 days my system has had enormous problems again and does senseless things.
To explain these things, I have included a screenshot of my own system monitoring.
I will look at the time from 6 a.m. to 10 a.m. by the hour.
06:00 a.m. - 07:00 a.m.
The system supplies the load from 06:00 a.m. because the electricity price has risen, that’s OK. (Yellow).
At about 06:30 a.m., the calculated minimum SOC is reached and the loads are supplied from the grid, which is also ok (red).
At 06:50 the system starts charging the battery from the mains, which is not ok because the electricity price is high (orange).
07:00 a.m. - 08:00 a.m.
The system supplies the load almost completely from the battery, which is ok, because the electricity price is high (yellow).
08:00 a.m. - 09:00 a.m.
A mixture of battery discharged, power consumption from grid and PV to the loads. Everything is ok.
09:00 a.m. - 10:00 a.m.
The PV system generates surplus, which is fed into the grid and not into the battery, which is not ok and affects the full hour (light green).
At about 09:50 a.m. the battery starts to feed into the grid, which is completely crazy (yellow)
The system was actually stable until 3 days ago without such failures, have you changed anything?
Something is going terribly wrong here, between 1 and 3 p.m. I had about 1.5 kWh of mains supply to the battery, which makes sense due to the prices, but no corresponding figures are proven in the VRM.
Of course, you can also look at it differently and say that the entire PV has gone into the battery and the energy from the grid into consumption, but in my view this is wrong. Without energy from the grid, PV would have simply served the loads.
Ok, I asked because Victron always prioritizes using the PV power coming from the MPPT to charge the battery and the power coming from AC-coupled PV primarily for the AC loads in order to minimize conversion losses.
That’s clear to me and that’s a good thing, but I still think that the compilation in VRM is not okay. But that’s whining at a high level, otherwise it works quite well.
