1-phase Multiplus II 5000 (Firmware V556) Cerbo Firmware V3.66 DESS in green mode
In the last few weeks I have seen unwanted behavior from the DESS.
This happens about one hour before, during, or just after selling power.
The Multiplus goes into a kind of standby mode and starts taking power from the grid for the needed loads.
The battery has enough charge, but I don’t understand what causes this or why it goes wrong. I have seen the Multiplus switching back and forth, as if the software keeps forcing it into another mode.
It’s not a big problem, but it means that power is taken from the grid at the most expensive moments. I don’t like this, because at those times the power is often not green energy.
Do other users also see this behavior from the DESS?
Can anyone explain why not every 15 minutes but every 7:30 the target SOC is changed?
And why this SOC isn’t increasing all the time but also makes steps down?
Is screenshot the real SOC, target SOC and charge current.
Clear to see that the system follows target SOC and it stops charging.
Is this effect only seen by me, and if how can I change it?
I’ve followed your information and also checked myself what the SOC Target for currently active auto operation shows in my installation (in Greenmode).
Below is the data from 2025-09-29.
As I see it now, the state of charge was 39%, the same as the SOC target.
Because of this, the installation enters a mode where further consumption is then taken from the grid.
I see it as follows: the target decreases from 39% to 38% over a period of 45 minutes.
Does this result from the calculated code based on DESS?
Is this value (1%) for exporting back to the grid not too marginal, meaning that effectively nothing happens?
What I see is that the SOC target steps now are not in 15 minutes but in 7.5 minutes.
And in the steps in-between I often see a step opposite that what I would expect.
And this causes stopping charging when charging phase is expected or sometimes I do even see discharging between 15 minutes steps.
This can’t be correct!
In Node red you can see under “Venus Settings” there are 47 target SOC, Duration and, strategy schedules coming from DESS.
