Tomorrow (4-10-2025) the energy price is the whole day around zero euro. (24H) I should expect that the battery will be charged during the day because the energy is for free. But this is not the case. The SOC stays the whole day at 20%. See picture below Even the energy of my solarpanels (forecast…

See this discussion to awnser some of your questions: [image] Node-RED DESS implementation issues with 15 minute pricing Node-RED Interesting. And also a directt confirmation that VRM-DESS is based on assumptions that put unnessesary (and unexopected) limits …

In what scenario would that be profitable? That will only happen if the prices of Sunday are higher and what guarantee is there for that? With battery cycle costs as a factor, the system sees no reason to charge. The system could very well decide to start charging once tomorrows prices are in and …

Dirk-Jan Faber, thank you for the explanation. That is helpfull. I understand the first part of the explanation. The second part of the explanation how to store my own solarenergy on a day with zero prices is ofcourse possible as you describe, but that needs manual intervention.

I presume that you also pay a fee to your electricity provider, like Tibber et all, and possibly some kind of energy tax and VAT as well, no? That plus your battery cycle costs may add up and make it still too expensive to buy energy from the grid. We here wait for the sun to come out to charge our …

You can always manual override DESS, that’s what I do now. Tomorrow I expect also low prices (there is a lot of wind).

[image] Dirk-Jan Faber (Victron Energy): In what scenario would that be profitable? That will only happen if the prices of Sunday are higher and what guarantee is there for that? Is this directed at me? I have stated my problem before: [image] Another Strange DESS behaviour I could as a …

And what if prices tomorrow are even lower, everyone would complain that the battery is already at 100%. Just manual override DESS, predicting the future is only guessing an not a proper DESS strategy.

[image] ron_h: And what if prices tomorrow are even lower, everyone would complain that the battery is already at 100%. How many days a year have you seen prices drop below 0ct before taxes? There is a very distinct pattern that the 0ct price point is a pretty hard market limit, which is only…

Not a day, but in 2025 the price was 682h negative and 8h for dutch consumers. [image] Negatieve stroomprijzen: momenten met veel hernieuwbare energie Negatieve prijzen voor stroom: jij gebruikt stroom en krijgt er voor betaald. Dat zijn negatieve stroomprijzen als je gebruik maakt van e…

[image] ron_h: Not a day, but in 2025 the price was 682h negative and 8h for dutch consumers. I take it you accepted the bet over a beer :wink: Now show me a day where the before taxes prices were more than 1ct below zero on average over the full day, that is the point here.

DESS algoritme not logical when the whole day the price is zero

Q&A and troubleshooting

UpCycleElectric (Jan) 3 October 2025 16:22 2

See this discussion to awnser some of your questions:

Topic		Replies	Views
Another Strange DESS behaviour DESS diy , domestic , dess	165	2899	8 November 2025
DESS does not respect the price setting and loses money DESS ess , dess	13	552	10 November 2025
DESS needs a rework from SCRATCH DESS dess	47	2253	20 May 2026
DESS ... sadly even with FW 3.62 still the same stupid and obvious errors DESS ess , dess	20	897	7 July 2025
DESS: PV returned to grid instead of battery charging DESS diy , dess , victron_community	53	759	2 May 2025

DESS algoritme not logical when the whole day the price is zero

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