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I have a radar connected to five solar panels.
There are no other consumers or producers.
At full daytime each solar panel provides 60 kW so five provide 300 kW.
The Satisfaction bar at the top left of the Electric network info chart shows 320 kW are required for full satisfaction.
I expect it to require 300 kW.
What is requiring the additional 20 kW?
Is this a bug?

Thanks for the report. The entity has an energy buffer which constantly wants to be filed, but because you produce only *exactly* the energy needed to run, it can't, and so reports that it wants slightly more power.

Thanks for the quick reply.
Interesting anomaly.
Indeed adding a sixth solar panel returns the Satisfaction bar to 300 kW / 300 kW.

Also of interest, which I should have checked earlier, is that the radar indicates it is satisfied with five solar panels.
I take from this that the radar is operating at its full rate when powered with five solar panels.

Strike the prior conclusion that five solar panels fully powers a single radar.

I must have taken the prior screenshot shortly after removing the sixth solar panel.
I checked again after several day/night cycles and at 300 KW from the five solar panels the radar is not running at its full rate during full daylight.
My assumption is that the buffer mentioned by Rseding91 was still at least partially charged when I took the prior screenshot.

Further testing shows that once the buffer is discharged during the first daylight dropout following removal of the 6th solar panel the radar will once again require 320 kW and will not run at its full rate with five solar panels during full daylight.

So, six solar panels are required to run a single radar at its full rate with no other producers during full sunlight.

This image was taken after 3 minutes of full daylight (normal Nauvis has 3.5 minutes of full daylight in its 7 minute cycle).
Another interesting artifact is that during full daylight the production and consumption stats for the five solar panels and the radar flicker between 300 and 301 KW when observed over a 1 minute interval.

Adding a sixth solar panel also extends the portion of the 7 minute day/night cycle that the radar runs at its full rate to approximately 4 minutes.
All in all this is a small issue.
I also checked this is vanilla 1.1.109 and it behaves the same way. So it is not new to 2.0.
Prior to the availability of accumulators the radar will drop out in the absence of daylight anyway.

I've added this additional information to correct my prior conclusion for anyone that may be interested in this nuance.