When my Multiplus 2 discharges to grid to sell electricity during high tariff I see often that it starts charging at the end of the high tariff which is very unprofitable.
I think this is a bug in dess when the multiplus discharges more electricity than expected during the high tariff hour and at the end of the hour it tries to reach the target soc of that hour.
Imo the victron should stop discharging when the target soc has reached to early and should never charge during high tariff. Best is to wait for the sun to provide free electricity or to wait for low tarrif if the sun doesn’t provide enough.
This issue has been discussed many times here in the forum. Please set the maximum charge and discharge rates in the DESS configuration menu to realistic values. These are not theoretical values that might be available according to the datasheet, but rather the values that the system typically achieves.
Actual they are set to the realistic values. But the maximum output power is not always the same, sometimes it’s 4000 watt and sometimes 4500 watt. I think it depends on the power factor
I know it’s similar for me. Try to find a somewhat realistic value. In my experience, the last few watts don’t matter, but some people enter the maximum power of the MP2 from the data sheet, for example, but also forget that their current consumption may be lower than that, and then the problem you describe arises.
Now I even have caught issue caught the morning while there was very little discharge (way below maximum power) it charged all the discharge back from grid again.
So first sell for €0.1804 per kWh and then buy for €0.312 per kWh causes loss instead of profit.
This is really wrong behavior which should be fixed imo.
My system does exactly the same thing.
Discharges in the morning to the grid, and then starts using grid power for loads, and charging battery partially from the grid right after. Even when there is enough solar energy available.
In my opinion it just needs a second SOC minimum for (green) DESS.
Now it uses the minimum battery SOC for DESS too, what creates this problem.
A second SOC for DESS will create a buffer zone so DESS can discharge to that, and battery minimum, where it starts using the grid, doesn’t kick in.
I now lower the soc from 25% to 20% around 2 am and raise the soc back to 25% around 4 pm with nodered.
Now there is enough margin in the morning to prevent grid usage.
Still a dedicated dess soc margin setting would have my preference.
