NOTC does not work for me. I would get full Isc when conditions seemed to be more NOTCish. I assumed when I got full Isc that meant it was like Standard conditions. You don't know how much air pressure is compared with temperature and light. To get all of those variables to line up per NOTC would be difficult. One component will be ahead of the other in real life.
With MPPT, to check it, you first check Isc of the panel, get rated Isc in the prevailing conditions, then connect up and see what amps to the battery are when the battery is low enough to have the MPPT in Bulk. That will be as good as it gets for amps to the battery except for edge of cloud events
My Tracer has a setting for temperature but I just leave it at 25C. Not sure what that is about.
Here is how I had the panel when I was doing the temp meaurements with the IR gun at the back of it. Lots of breezeway. As mentioned, the temp is not the same everywhere so it would be hard to get each cell's temp and do its voltage calculation from the coefficient and add up all those voltages to get your "panel voltage". It sort of works as an average using the middle of the panel. (Not showing are the bungee cords I had all over the back of that to stop it blowing away)
My Eco-Worthy has a funny program for seeing how much better it is doing than PWM would be. It is sort of bogus, but it turns out that its PV amps reading is the same as the Isc reading by meter, so you don't have to disconnect the panel to get that figure with the Eco-W.
