That would be nice to have in vrm as well.
I Always have the problem, that - until next day prices are available - the system schedules for 20% (min soc) at the end of the day.
Then, it suddenly realizes “Uh, but I would need 45 soc at the end of the day”, has to adjust the roadmap and make some less ideal stuff to catch up, because the very cheap hours have already gone by, while beeing “fine for the 20% target”.
It is a good idea with an extra setting we can help the system.
But what we need is that Dess not start buying and wait until prices are low.
The system is so busy with the SOC-value that it forgets to look at the best price.
+1
I would like this option of a lower treshold for selling too 
Maybe something to add:
Greetings from Finland
3 days old system and learning to use DESS. Battery 280Ah@48V. It is winter in Finland now and the panels are not producing anything. Electricity prices vary greatly so I was hoping there would be limits to charging and/or discharging the battery. For example, the battery is not discharged if the price is below 4 cents/kWh but electricity is saved for the more expensive hours by force. I also wished for a regulation forcing the battery to be fully charged e.g. if the price is below 2 cents/kWh. But good job Victro and I wish a long life to the DESS.
By the way, has Victron thought about a reserve market for electricity
Same “problem” today, the battery is fed into the grid and recharged in the next hour even though there are more expensive hours ahead.
I assume that DESS takes into account the efficiency of the system. Where can I change the efficiency?
Because I have actived blocking of battery discharging to grid, the bigger deal in Trade mode for me is using power from PV instead of using power from grid in case of negative price… https://community.victronenergy.com/t/vrm-feature-announcement-manage-negative-energy-prices-in-dynamic-ess
Better behavior is to use grid and don’t use PV for grid stabilization, extending lifetime of MPPTs/solar panels and better energy bill which should be the goal of Trade mode.
I experience the same problem, DESS sells to much electricity in the evening. When in the evening, night or the morning some device uses more energy than predicted the electricity is bought from the grid while it’s more expensive than when it was sold causing loss.
A configurable dess minimum soc margin of 5 or 10% would be enough to solve this problem.
