3x Multi RS Solar throttling feed in, why?

Q&A and troubleshooting
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1

Hello,
I have a large PV system with 3 Victron Multi RS Solar 6000 and 2 AC inverters of 9kw and 5kw in surplus feed-in mode.

When the sun shines strongly without shading or clouds and all module fields generate energy, the Multi RSs start to limit their output.

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I have marked the missing power of the Multi Rs with red boxes in the diagram. The yellow boxes show how the power of the AC inverters continues to increase
The battery is of course already fully charged at this time. I can’t see any errors in the log that cause the power limitation. The mains voltage reaches 242V at this moment. Actually, it should only be limited at 252V, right?

How can I find out what is happening here? Where can I look?

BR

2

Normally I’d say that your 15kW shouldn’t be able to raise the mains, except when its a very poor grid you have there.

3

Mains are 50A. And in Inverter setup the standard VDE4105 settings are set so 10% more then 230V should be ok. This is the reason why i am confused…

4

What i meant is that the Grid is going up, and in some way motivates the inverter to slow down.

The reason for this should be “somewhere” in your settings.

5

i checked all settings in gx and in victron connect and found nothing that could be the reason for this…

6

It could be in the AC-inverters…

7

Is it the same issue as this?

8

unfortunately yes. there does not seem to be a solution at the moment. Perhaps an update to the newest fw 1.23. Currently i am running 1.20

9

Tried with 1.23 last week, did not help.

1 Like
10

I would try to turn of the AC Inverters for one day and see, if the RS behave the same, or if they now keep their maximum production during the day.

If not, then there is a relation that they throttle as acpv increases.

11

This is only related to the external victron meter (in my case the vm-3p75ct ). As soon as the external meter is disabled in Victron Connect, the throttling is gone. But we can’t disable the vm-3p75ct grid meter as we would blow out the main fuses of our grid.

12

I need the Grid Meter since not all the loads are connected to AC OUT.
So we need to wait for an Update that fixes this…

13

I tried to switch off “Support of energy Meters” in all 3 Multi RS" Settings but it did not change anything. max 20A feed in and if the ac inverters reach this, die Multi RS will stop producing energy at all. :frowning:

Edit: I think the reason is that my AC Inveters are currently conncted to AC OUT. So the energy is counted. I will switch them to AC IN, disconnect the Meter and will try again. I will keep you updated…

14

I have my PV inverters on AC IN so that makes sense

15

Hi all,

This is because each RS at the moment maximises its feed-in to 5kW.

Sorry it took a while to find out exactly why this is. We’re working to improve that.

16

Even if the RS is only supplying a couple of watts if the SolarEdge PV inverter is doing all the rest?
So it must be some software bug / hidden setting that limits the total grid feed in to 5kW.

17

Sorry, maybe I am missing something…
How much should it feed-in continuously, at about 40*C, the normal/usual operating temperature?
Isn’t it the Multi RS a 5kW inverter?

18

In this 5kW all energy from AC Inverters on this phase is included, this is the software problem we are facing. A workaround is that the Multi RS does not know about the ac inverters. Put them on AC IN and disconnect Meter, for the heavy sun hours…
Or just charge the battery at these times..

19

The problem is that I cannot disable the external meter as then the power would go over 11kW per phase, blowing out my main fuses.
My SolarEdge PV inverter on AC IN is able to provide 18kW in total, so 6kW per phase, add another 5kW from the Multi RS and the fuses go boom.

But if I enable the external meter, the feed in is limited to 5kW per phase only.

20

Sorry, maybe I am missing something…
How much should it feed-in continuously, at about 40*C, the normal/usual operating temperature?
Isn’t it the Multi RS a 5kW inverter?

The Multi RS inverters are actually able to provide about 5,6kW of power. It is a 6KVA inverter