For everyone that do not need an AC throtteling to Grid at all i have a workaround:
Or just disable external current sensor 
I have my AC-coupled PV on AC out, as well as all my loads. The Multi RS is the first and only device after my incoming single-phase 40A connection. It doesnāt happen often, but when I want to discharge and I have a lot of solar production that I want to feed back to the grid, the RS limits the power to 20A. I donāt even have an external current sensor in my system. Turning this setting on or off makes no difference for me. The RS always limits its AC input to 20A during feed-in.
So I can disable the external current sensor, but even then, because I have AC-coupled PV, the RS still limits my max feed-in current to 20A.
Only a firmware update can fix this. I do find it strange that the datasheet says the RS has a transfer switch that can handle 50A passthrough, while this only applies during import. During feed-in, itās currently not possible in any way to have more than 20A passthrough. I guess it depends on the definition of passthrough, but in my view, the RS does not meet the datasheet specs with the current firmware. And thatās a shame, because I chose the RS assuming this would work and the datasheet was correct. But again, maybe itās just a matter of how passthrough is defined.
@Nick This solution (switch off ext current sensor at all) will not use our battery when load in on ac in.
I have my AC coupled PV on AC-in and it still limits export to 20A (5050W precise).
When I have a lot of PV power, the Multi RS just sits idling instead of discharging to grid (when prices are high)
Good point, I wasnāt aware of that. I could not test that either because if I disable the current sensor, I am pushing 35A through my 25A main fuse
Ah, yes, that makes sense. In that case, the problem is the same, but it limits at the external current sensor. And since you canāt disable the external current sensor, removing that software limit is the only thing that would help in your situation too, right?
Yes I am desperately waiting for a fix / firmware update that solves this. But I guess weāre only one of few people that have this issue (or weāre just the only one who actually noticed the export limit), so I guess there isnāt really a high priority on this issue, even though @mpvader already confirmed that this softlimit bug is confirmed by Victron staff.
Update: currently testing with a new test/beta firmware for the Multi RS and for now, it seems that the export limit of 5000W is fixed! Will do some more testing to see if any other bugs might pop-up.
Ah thanks for the update! I also saw it in the changelog of the new beta, but havenāt had a chance to try it yet. Keep us posted!
Where do you find a changelog of beta firmware for the Multi RS? Iām curious to see what is coming
I donāt know where to find it, I got a private message with the beta firmware
Same as @vaursechs. Got a message including a bit of the changelogs
Iāve done some further testing and I have discovered what seems to be another soft limiter.
At the moment, my Multi RS on L3 is exporting energy to the grid on max power, without any load on the AC Out side.
The maximum power at this point seems to be about 5100W at 101A DC being drawn from the battery:
At first glance this would seem totally normal as this would be the nominal maximum output power of the Multi RS.
However, when I put on a load on the AC Out side, the total power rises to over 5350W and a DC current of more than 107A:
This seems to indicate that there is still something limiting the Multi RS to exporting at its full potential.
At the moment, there is no Solar so this is purely the Multi RS doing its thing.
Did you sign up for a beta testing program?
Was that beta firmware attached to that private message?
Thanks!
Yes the beta firmware was send to us for testing purposes.
In my latest post you see that I have found the Multi RS to be throttling again in a certain scenario. It is not related to the export limit when AC PV is connected and using an external current sensor, that issue seems to be solved with the beta firmware.
OK, so thatās clearing some aspects.
But did you sign in for this, for receiving beta firmwares, or did you find the firmware āin-the-mailā?
Or did you registered on the professional site as an installer/dealer/distributor and not an end-user?
Itās not the first time users have spoke about multi rs beta firmwares on here and I am asking this because I donāt see a mean to obtain certain beta firmwares like in the case of venus os and trying to see which is the proper channel for obtaining theseā¦
I did not sign up for anything, simply because I donāt know where to sign up.
I got the firmware attached in the email.
Thereās no public beta tor firmware that I am aware of. Based on a reported issue you may be invited to test software before it becomes public.
Yes that was indeed what I was told, I could test the software to see if it fixed the issue.