I'm coming around rather rapidly to agreeing with the posts stating that optimizers are useless. I was able to clear off only 4 of 9 330 watt panels on one of my 3 strings to my 11.4 KW Solaredge inverter yesterday, completely unobstructed these 4 panels in full sun produced a whopping 8 watts total combined for the day. I believe the problem is that there is a minumum voltage necessary for the inverter to draw power from the string? Does anyone know if this is the case and what those values are? If I shovel off 1 more panel will that fix the problem? The only value in the inverter spec is 400volts nominal.