I have a Multiplus II 48/5000 which is setup as DESS. grid setpoint is 0 watt.
When the schedule is to only use grid and no battery, my battery will still slowly discharge, with about 75-100 watt.
This is a screenshot taken at 08:30 in the morning, the schedule is to not use battery power, fully use grid. But the blue bars in between the x-axis en the reds bars (from 00:00 till 08:00) indicate the battery has been used anyway. I would expect only red bars, as is also predicted for large portions the rest of the day.
Here is another screenshot, also showing the battery is discharging. This while the schedule says there should be 0 discharge, and all consumption (230 watt) should come from grid.
What @lxonline said is correct. My system has 4x 10k Quattros and the “idle” consumption is 400-500W. Quite unfortunate.
When the system is set for a scheduled state of charge above the configured minimum SOC for ESS, the inverter / charger circuit seems to remain active. That power draw is what you’re seeing
I believe this is because of the Peak Shaving feature. I was hoping it would be possible to disable Peak Shaving for systems that don’t need it, but it’s only possible to configure it to disable when the battery SOC is below the ESS minimum SOC.
There was a thread a while back where @mpvader said they’d look at adding an option into Venus 3.70 to permanently disable peak shaving, but I don’t think it made the cut.
Power to run the system mppt/shunt/bms/inverter ect ect has to come from somewhere and thats your battery. Due to system being powered from battery, to allow for off grid running.
