Is your Apex300 absorbing much less, around 15% of your panel rating ? Yes, upgraded, PV settings done, high voltage, Volts max 39, new panels, etc. this is my second Apex300 , I believe they don’t allow the system to absorb enough, its capped, but they won’t say. I have 2 panels of 415W each, in each input, still only getting at noon max 150W total from each input.