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victronenergy / dynamic-ess

MIT License
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[VRM - Bug]: battery load starts to early #105

Closed pokeplayer2 closed 8 months ago

pokeplayer2 commented 8 months ago

Contact Details

No response

VRM portal ID

b827eb6ff17f

Country / region

Germany (de)

B max

26

TB max

6,5

FB max

7

TG max

30

FG max

30

Battery costs

0,02

Buy price

p+0.217+0.0161

Sell price

0,115

feed-in possible

None

feed-in control

None

What happened?

Load battery at too high price

When did it happen?

16/10/2023 09:00

Screenshots

grafik

price overview: grafik

It works fine when I switch off the dynamic ess solution, but this is not the idea ...

Here can you see how many energy was imported over the day until 11 AM and the battery was never empty :-/ grafik

dirkjanfaber commented 8 months ago

At the moment this is considered expected behavior (See the manual):

Also keep in mind that, when doing a consumption forecast, the system does not known when during the hour that consumption will be done. If the forecast does not match the reality, Dynamic ESS does keep the planned battery usage stable while punishing the forecast inaccuracies on the grid (selling the excess to grid, buy the additional need from the grid). This can be less ideal, but it is an issue of the forecasts being inaccurate, nothing that the Dynamic ESS decided.

We are working on adding a way to disallow feeding from grid into the battery. That will likely solve this.

pokeplayer2 commented 8 months ago

I allow feeding from grid when the price is low and the battery is empty ;-) in the morning hours it was cheap and during the day ... no problem to feed from grid. I look only at the money and at this moment it was terrible to buy from grid ... high price and battery had a good amount of capacity. Other solutions working with minimum hourly load which can be manipulated by the user. I start this week my heating system, so I know my daily needs of power is much higher as 28 days before ... the forecast will be wrong by default. Or ask the people if they have an electronic heating system ...

dirkjanfaber commented 8 months ago

From the latest candidate release (3.20~17 and higher) it became possible to add restrictions (see https://github.com/victronenergy/dynamic-ess#restrictions). Can you switch to that and test? I'll close this bug for now. Please create a new one if the problem persists with that new version.