Is something like this legal in the US? Legion Solar 4 - Permission Free Energy and Storage they make the statement that it is OK because they measure & throttle generation to eliminate any power going back on the grid. Therefore, they claim it isn’t grid tied. they also provide some guideline for circuit to plug into. But, of course, disclaim any responsibility. Not reviewed for code, etc. My assumption is not legal, but if it is illegal, what statute makes it illegal?