ESS PV priority

Q&A and troubleshooting DESS
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1

Hello all

It’s my first post here and need some advice. Also sorry for my englisch because is not my native language :slight_smile:

I’m looking for some configuration to give priority of PV power.

  1. Home loads
  2. Grid feed in
  3. Changing battery’s
    To make the story shorter, are some problems with feeding in on my area (many solar plants and the grid gets overvoltage from 12 to 3 pm). Because of this issue,is there any way to configure the charging between that hour’s and use the morning time just for grid feeding in?

Thank you

1 Like
2

You could use scheduled charging to define when the batteries are charged from solar/grid

3

Or use DESS and schedule charge and discharge. Do you feed into grid?

4

Or use on-grid voltage stabilizers that will lower down voltage to 230v

5

Thanks Alexandra
Can you please explain a little bit farther?
I try to configure the schedule charging but the batteries was charging whatever i add to the settings.

About your question with grid feed in, is yes. Also is another fronius 6kw inverter with AC coupled solution. 4.6kw pv with victron 250/85 mppt and 6.7kw pv with fronius.

6

Are not aloud in my country. But thanks for your advice

1 Like
7

I’ve tested but doesn’t work. Maybe some wrong configuration?

Screenshot_20240923_194824_VRM
Screenshot_20240923_194824_VRM2340×1080 141 KB

Something like this?

8

ESS start manual is here.

DESS here. It is based on ESS.

ESS controls mixing grid and solar as well as feedback.

9

I read and test DESS but still doesn’t help because i don’t charge the battery from grid. Only PV. I need an way to start only the pv charging between 12 and 4 pm. Rest of the time to give priority for loads and grid feed in.

10

You will have to look into node red then, you can changed the SOC dynamically on time and feed in

11

Here im stuck. Tried few times to add some automation in node red and the ending was with home assistant. I will read again about this but it’s heavy for me to understand how it’s working :smiley:

12

Hi Alexandra
Can you please help me with some information. Today i was trying something else. On DVCC maximum charge current set it to 10A ( slower charging to feed in more power to the grid) seems that the limits from DVCC settings doesn’t work. After another test with limit from multiplus charging amps settings, seems that the control is from there. So the DVCC doesn’t have control on the system. What I’m do it wrong?

Thank you

13

It is more difficult with DC mppts.
In any case the manual explains the CCL is ignored in DVCC with DC MPPTs when feeding back.
You might have more luck limiting charge voltage. In that section linked above you will see to feedback it uses a 0.4v potential. You can possibly use the offset to manipulate the feedback.

14

That’s sad news. Thanks for fast answer. So i can’t use this way either :confused: