DESS decisions make less sense every day. I have now had multiple of these absurd totally opposite-to-plan behaviours. I will start documenting them here in case they might help develop DESS into a better product. For example here: Online DESS has planned to charge grid to battery with seeminly f…

During the night, DESS Trade mode planned and succeeded in charging the battery from grid. At 7:00, market price spiked up to a very lucrative 0.3€/kWh. DESS Trade mode decided to IDLE NO OPPORTUNITY for the whole hour. At 8:00, DESS finally decided to start selling, as planned by the online syste…

And now DESS trade mode is selling for less than buy cost. Obviously I would expect that the system does not sell for less than buy cost. Especially when it charged last night, and I had to pay for it, and there is seemingly no solar excess that would not fit into my battery. [image] [image]

I did a few edits to the posts above to highlight the undesireable decisions and add some clarity. Hopefully this helps eventually improve DESS. I am sure I am not the only one struggling with this behaviour. It would be great to get some insight from Victron about the development/future of DESS. A…

[image] jkoljo: I will start documenting them here in case they might help develop DESS into a better product. Sure thing, Feedback always helps to either find bugs or just improve things :slight_smile: I’ve send you a PN for your VRM-ID, will look into our debug-tools, what’s happening ther…

I’ve checked all 3 things, and figured out the following: [image] jkoljo: For example here: Online DESS has planned to charge grid to battery with seeminly full speed However, my Multiplus stubbornly keeps discharging with SCHEDULED_MINIMUM_DISCHARGE plan. Maybe the online vs local timing is …

I appreciate the analysis. It makes more sense now, and hopefully the minor scheduling/plan displaying bugs get resolved. Thank you. I have been trying Green mode for a change, and noticed it maintaining targetsoc instead of supporting house loads if the plan was to have excess solar and do excess …

[image] [image] Tonight Green mode again decided to idle instead of supporting house loads from grid. Light blue color in the Reactive Strategy is IDLE_MAINTAIN_TARGETSOC. SOC limitation is 5% and battery voltage is also way way above the minimum limit, so there was energy available from the bat…

I had today strange behaviour. At 19:00 DESS started grid to battery even my battery was 70% and price was highest. I have in nodered informations what it was doing. [image] [image] so it seams i had 70,4% battery and target was 71% and it bought from GRID??? [image] It predicted SOC higher …

I’ll send you a pn, if you could give me your system-id (the numeric one in the VRM url) I could look up some things. Usually we have a charge hysteresis of 1% to exactly avoid this from happening - seems like that didn’t kick in here.

@dognose , all, Quiet a lot of “supposed” incorrect DESS effects come from unknown system considerations and decisions. Why not visualize it a bit more sophisticated, making DESS more transparent: Replace the Inverter/Charger message in the Cerbo Overview page with something more useful. Instead …

A series of incorrect DESS behaviours

Q&A and troubleshooting DESS

jkoljo 16 October 2025 15:09 13

I have been having some DESS timing issues so I placed a charging from grid restriction for 21-22. Interestingly, the VRM does not really seem to really care:

Topic		Replies	Views
DESS Green Mode charge-discharge-carge DESS ess , dess	55	597	23 December 2024
Another Strange DESS behaviour DESS diy , domestic , dess	165	3051	8 November 2025
DESS ... sadly even with FW 3.62 still the same stupid and obvious errors DESS ess , dess	20	914	7 July 2025
DESS: strange behavior 10 minutes before the hour DESS ess , dess , cerbo_gx	33	543	18 March 2025
DESS: Green Mode sells to grid instead charging Battery DESS expert , ess , vrm , dess	48	2228	9 September 2025

A series of incorrect DESS behaviours

Related topics