That's insanely huge. While I am drooling over all that power, I note that for full marks, the owner needed to cook up a mechanism to raise the outboard extendible panels to be level with the middle one. Or maybe extend them further like the little ones. Even in this show-off video, there's enough shade on the right rear panel from the centre one that all of its output is killed. Thus while nominally 1600W, the system is only providing 1250 at that moment.
And that's not factoring in those 2 white antenna things. Even those little things may kill off some or all of any panel they shade. In some orientations of the sun, the owner could only be getting 900W only. "Only"...