Loosing money on DESS

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.

I fail to understand why is the system trading if it cant make money? Is my configuration broken or the DESS?

Regards.

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 DESS off and all electricity comes from battery and solar, and zero from grid

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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?