Yes, but at that max power it heats up and is derating…
This is why I’ve said 40 deg.C, in reality could be more than that, in a continuously max power run.
The Multi RS doesn’t even get warm like the multiplus. Mine is running at 100% load for hours and doesn’t even get above 35c
The temperature read on the metal case (or exit airflow), or the temperature of the heatsinks read by the sensors inside?
For example, in my case, when the inverter is generating about 4200W, the temperature of the heatsinks read by the electronics inside is about 44 deg.C. In the same time, the case is about 35 degC
The datasheet says it’s derating at about 4500W at 40 deg.C
So, in a way, maybe this could be a reason of “why” in the title… 
The Multi RS has much better cooling compared to the MP2, I had 3x MP5000 before I switched to the Multi’s, the MP2 were getting HOT compared to the Multi RS. In fact, the metal case of the Multi RS isn’t even getting warm at all.
However, even if the Multi would get 60C, this still is not an answer to “why” in the title of this topic, as the feed in limit is FIXED to 5kW, no matter what, even if the Multi is only delivering 100W and my AC coupled PV inverter is doing 4900W, the total amount CANNOT exceed 5000W, UNLESS the external current sensor is disabled, then I am able to get over 10.000W.
As Matthijs Vader said, they are working on a fix for the 5kW feed in limit.
It seems the problem is fixed for today at my system:
What did I do? I had switched my AC inverters and the load completely to AC OUT. 20A Limit was there. Now I have switched both back to AC IN (as it was before with the 20A feed-in limitation) but now there is no longer this limitation. I am curious whether this is now permanently the case
The only thing i see is that the power of the mppt drops for 30min when the bat is full:
The only thing a changed is a node red flow that limits the bat charge current, so that the battery will not be fully charged in the morning hours but in the peak hours…
