I have connected Multiplus-II 3000 to an old LiFePO4 battery pack and is being used only for trading. after the recent update the dashboard shows the money in net. I have observed that there has been days that it makes money for me, but there are also days I loose money. [Screenshot 2024-11-25 15…

I just dont think DESS is intelligent enough to do what we expect, or think we expect, I just made a post where DESS is taking some electricity from the grid, rather than taking it all from the battery and solar, so costing me rather than using the free energy I have already generated,. I switch DE…

Thanks for replying. I think the battery efficiency is also to blame here. It would be nice if we could set a minimum difference between buy to selling rates ratio which could ensure profit. Is there any such option to configure?

I’m not sure it would affect VRMs internal profit calculation but you seem to have the same price calculation for both buying and selling. At least I don’t get to add VAT, grid fees, electricity taxes to my sold electricity so that might artificially inflate the sell price vs reality. [image] Thi…

I think efficency is the issue here. your example shows 8 kWh pulled from grid, but 5.8 kWh only feedin. That is 72% efficency, if we expect nothing went from bat2consumption. To avoid this, you should increase the battery costs, which would make the window between “buy/sell” for trading larger. I…

[image] Michael: Instead of playing around with the battery costs, I would prefer to set the system efficiency correctly That’s also my opinion! Because that works regardless of whether prices rise or fall more sharply later on.

Hey fellows, thank you all for your input. I haven’t delved into the formula as such, it was the default formula that comes up when I select the Provider and at a glance I think it is right. Thanks for bringing up the efficiency chart. and as for the efficiency of the Multiplus is concerned I thi…

just download your Victron production report over some month and calculate your efficiency. Here for example: [image] [image] 1206,6 / 1644,3 = 74 % You can set the efficiency also via Node-RED instead of ssh and dbus-spy if you want.

What also bothers me regarding this topic is that these charge / discharge counters can be very much inaccurate. Reported kWh from my Pytes Ebox 48100R via BMS-CAN are proven to be based on “Coulomb” counters with fixed voltages. That means it will count only As (Ampere seconds) and multiply that w…

[image] HansDampf: PS: Pytes is stating 95% round-trip, but counters say it’s 82%. I guess they measured 95% with 1A charge/discharge currents Yeah, it’s the same as a car manufacturer says “You’ll can drive this with 4.5l / 100 km”… yeah… you “can”. :wink: At the end, a “real” efficiency is…

Loosing money on DESS

Q&A and troubleshooting DESS

MSchlenstedt (Michael) 14 December 2024 06:59 6

Instead of playing around with the battery costs, I would prefer to set the system efficiency correctly. It is set to 90% by default, which is to high in many cases.

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Loosing money on DESS

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