DESS Control - possable configuration?

[JM_NL]

Hello Victron,

I like the DESS idea. I would love to use it, but I find myself batteling DESS behaviour all the time.. Right now I kind of ‘snoozed’ DESS and set my RS System to External Control.

So I was wondering..

My setup contains out of ~4.2 kW solar panels. I have a home-made Battery of about 25 kWh. My house usage is an avarge of ~14 kWh a day.

Let’s take today as an example;

Today was a sunny day (just like yesterday, and tomorrow). My battery was at ~80% full today at 08:00. When the sun starts to shine it will in general be able to fillup the battery at arround 12:00.

Then after 12:00 you can see that the energy being is being fed back to the grid.
This process repeats itself everyday.

So I ended up dumping energy to the Grid ony a very ‘cheap’ moment, therefore not getting any monney for it…

Now I would like to control the ‘selling’ behaviour better. For example tell DESS that whenver forecast is above X kWh tomorrow, It would be allowed to sell Y amount of kWh to the grid in the most expensive hour.

In my case, tomorrow is forecased to bring 18.7 kWh of solar energy.
My house uses 14 kWh on average every 24 hours, so tomorrow will leave me with ~4kWh to mutch. And therefore will be fed back to the grid on a bad price…

So I would like to control this better and sell the 4kWh that is expected to be on the most expecsive hour…

I hope this makes any sense

[Sarowe1990]

Then please enter your expected price. Your chart doesn’t even show a selling price, does it?

[JM_NL]

yes it does, it`s exactly the same as the buy price… therefore the lines are on top of eachother.

[Maxs (Johan)]

Do you run dess in green mode? I do, and it empties the battery in the evening or in the morning when prices are on the highest level, so it can charge the battery again. But you have to set it in the settings from dess. restrict battery use to no. hope it helps you.

[JM_NL]

I thinks you touched the problem, my expected grid usage is mutch higher than my real usage.

Therefore DESS might not be dumping energy as mutch as I would like to….

I used to have an EV and that used to be a huge load on my system, but the EV is gone. Is there a way to reset/relearn my expected grid usage? Can I manually overwrite this for once and let DESS calculate again over time…..?

[JM_NL]

Just to clarify, my average daily load on the grid is 15 kWh , yet DESS predicts 40 to 51 kWh

I guess this is the reason DESS is not selling because it thinks it needs the energy for consumption.

DESS only cells energy just before the solar panels are charging the battery again

Can I manually overwrite the expected grid usage for once?