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zed-must asked

why does DESS take from the grid when my batteries are full

during peak pricing, when batteries are close to full, why does DESS take from the grid? Even a simple ESS knows to take from the batteries during the day but DESS uses the grid instead of inverting? it makes no sense

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Craig Chamberlain avatar image Craig Chamberlain commented ·
Yeah I turned DESS off this evening for this exact reason. My batteries basically sat at 100% all day and that was with minimal solar energy available. Meanwhile the grid is being used for all loads even though it's peak rate.


I even have my battery costs set to 0.01 because my preference is to use the batteries since I've already paid for them and they are rated at 8000 cycles which is more than I can possibly use within the warranty period anyway.

There are times that DESS seems to work really well but I tend to lose confidence in it at times like this. I think I'm just going to build my own custom Node RED flow to do exactly what I want.

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Dennis Leth Andersen avatar image
Dennis Leth Andersen answered ·

I have exactly the same issue of buying from the grid with 100% full battery's. I have 62KwH battery so enough capacity during the evening and night. Also in the morning time DESS will sell all the power before the sun/PV produce enough power. I have to turn DESS ON and OFF depending of the consumption.

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