DESS sells to the grid at a negative price

[Slowmo]

I switched DESS to Green mode as it will not charge the batteries if it cannot sell anything due to low or negative price (see my other report here: https://community.victronenergy.com/t/dess-not-charging-when-sell-price-is-0/62978/8). It now calculated that the battery will reach 100% the next day and there is some spare energy to sell. But the problem is that the price at that time slot is exactly 0.00. My sell formula is (P - 0.02), because my energy supplier takes 2 cents from the electricity price when I feed to grid. I checked the actual Nordpool price thinking that the price might actually be a fraction of a cent over 2 cents (third decimal digit), but it is exactly at 20.00 EUR/MWh. I don’t think it makes sense to discharge the batteries at no benefit to me.

And Costs and Earning graph shows I will actually be losing money due to battery costs, so no idea why DESS is doing this

[Slowmo]

A little update. The sun came out and charged the batteries a bit more than predicted, so now it will try to sell at a negative price.

So I think what is happening is it tries to avoid the situation when there is solar production but the batteries are at 100%. It looks for when the price is the highest and dumps the excess to grid. And it so happens that the time with highest electricity price is still negative.