The DESS scheduler does things that are very unclear to me while there is no visibility into the reasons the system is doing what it is doing.
2 examples:
Today the DESS schedule (Green mode) wants to start selling the surplus energy one hour late.
The difference between the initial sell hours is 15,20 euro cents (82,57 vs 67,37), so not insignificant.
The difference between the overflow sell hours is 15,76 euro cents (67,37 vs 51,61), so even more.
For me Green mode would be the intended schedule, I do not specifically want to trade,
but I am very disappointed by the system wanting to sell 15 kWh to the grid one hour too late.
If the system wants to sell, OK, but it should do that when the payout is maximised.
Due to bad weather today the system had not been able to charge to 100% SoC, so it was already using battery power from 18:00 til 19:00.
That in itself would be OK to me, my idea is to be self sufficient, but not if the system will first use, then dump for a low price because of a schedule error.
I set the system to keep the battery charged to 100% to force it to charge and had to overrule the system by setting it to trade mode.
Perhaps there is a good reason for the behaviour, but it is not found in the VRM GUI.
Also missing is an indicator when the schedule was calculated, will recalculate or having a button to force a recalculation.
Similarly, yesterday even though the battery SoC had become 100% from solar 2 days ago, the system unexpectedly increased the minimum SoC with 5% (I am using the ‘Optimized with BatteryLife’ setting) and started charging the battery immediately while it could have waited a bit of time and either could have charged from Solar or with cheaper grid power. It would be good if the ‘Optimized with BatteryLife’ would have a grace period before needing to charge.
Yesterday the difference in grid price was not very large, but I have had the same behaviour this winter when there was a 20 cent difference between the hour it determined it wanted to increase the minimum SoC and the next hour.
Note that this day the selling of surplus was aligned with the most expensive energy price, so it is able to do it as I would think it should work.