I have an 3-phase ESS system with MultiPlus 5000/48/70-50, Cerbo GX and Seplos batteries. At the moment I don’t have any PV. I will add it in the near future, but for now I am running it without it.
I configured ESS charge schedule to charge the battery during the night (22-06, 100% SoC). Outside of this time I’d like the system to assist the grid (using grid setpoint), but not charge the battery even if there is spare grid power available. It is correctly providing extra power when the demand exceeds the setpoint, but then it immediately starts charging back as soon as the demand drops. How to configure it to only charge during the schdule? I tried both with DVCC enabled and disabled. I tried to run it Optimized with and without Battery Life.
The only way I can prevent it from charging all the time is to set charging current to 0A, but this being a manual process isn’t the best solution.
Is the fact that I don’t have any PV confusing it? Would connecting MPPT without any solar panels connected to it make any difference?
The only time it makes sense to cycle a battery with no pv is when you are offsetting expensive tarriffs and charging in cheap ones.
Or maybe peak shaving?
ESS is designed to mix solar, storage and grid. You are missing a pretty important part of it.
It may possibly be the seplos. I read somewhere on a random thread (if i come across it i will link it) that they seem to be able to ignore DVCC being disabled.
Try with comms disconnected instead. Just be aware that wil have bms lost messages and may need to reset things.
Just for the record - I am installing PV into this system, but I expect it to take a month or so to do that. The idea was to at least do some peak shaving until I finish that, but from all your comments it seems that this isn’t really sensible. Instead of focusing on that it seems to be better to focus on installing PV.
