When using DESS there is electricity imported from the grid while price is high:
I think this is caused because the minimum SOC for the specific time slot has reached too early.
A solution would be a DESS SOC margin. For example, when the minimum SOC is set to 20% and the margin is set to 10% DESS tries to reach 30% minimum SOC but will continue to 20% if the schedule is not matching the actual consumption.
I see this issue with firmwares up to Venus OS v3.60~68.
Hi thanks for the report. We’ will look into this!
I agree that having a configurable margin of some sort would be intersting. I have a fairly large system (4x Quattro 10ks), and the power draw of the inverters themselves is ~400W+ continuous.
I’ve found on low PV days, the system will buy power during a peak period, because the consumption forecast didn’t account for the continuous power draw of the inverters themselves and the system hits the min SOC too early in the day (https://community.victronenergy.com/t/dess-slowly-discharging-battery-when-scheduled-to-keep-target-soc-flat/)
Outside of adjusting the DESS algo to include this continuous power draw, the margin idea may be another work-around.
At this moment I have running the AC, causing a higher consumption.
DESS doesn’t discharge to supply loads although the electricity price is high.
When I disable DESS the grid immediately drops to around 0 watts which is preferred behavior during high electricity price.
During DESS idle periods it would be better to keep grid at 0 watt or less to sell pv surplus instead of holding target soc until the sell period starts and buying expensive electricity or consumption.
I’m using trade mode, in green mode dess starts charging in the morning when the sell price is still positive causing to sell pv electricity during noon for a lower or negative price which is unwanted.
