Looks like its a GT5.0 ?? .... the peak AC is 4124 which is more than I believe the GT3.8/SPR4000 can do as they are limited to 4200 watts DC

That means the array, even in the summer tempatures is putting out almost 4.4kw and I'm sure the sun angle is off ... very impressive array performance from the SunPower panels!

Actually it is another 4000x. The DC power peaked a little over 4300. I have a $10 fan on a timer blowing on it to keep the temperature down. As soon as the 5000x comes out from SunPower I will get the inverter replaced again. It was mostly cloudy today, but it's supposed to be clear all day on Thursday with low temps. Let's see how well it does.

So are you able to leave the wire box attached to the wall and swap inverters, and will the 5.0 fit onto the 3.8 wire box, or does it all have to come off ?