More MPPT Confusion and Question
Still trying to understand my MPPT set-up and what would be the effect of changing things a bit. My 230w (30.0 Vmp x 7.7 Imp) poly panel has a Vmp of 30.0v with a measurement tolerance of +/- 3% S...
Forum Discussion
I understand that the controller will still be tracking for MPP but was thinking there is less power at MPP. I was looking at that knee drop off at Vmp where a small change in V makes a big change in A and thought that 0.3v would have an exaggerated effect if the V the controller is "seeing" is higher by 0.3v. Except it measures lower at 29v at the controller vs 29.3v at the panel--I am confused which direction the controller is "seeing."
I was separating that maybe big effect from the straight 1% loss on the wire, which is pretty straight forward. If that 1% goes to the output then 15a would lose 0.15a ?
I am seeing 180 watts at the output when panel temperature is 50C. That 50C vs 25C is supposed to create a 10% power loss or 23w. So I should see 207w - 1% or 2w = 205w less controller efficiency? I am still missing 25w somewhere (205-180) The controller is supposed to be quite efficient.
I was separating that maybe big effect from the straight 1% loss on the wire, which is pretty straight forward. If that 1% goes to the output then 15a would lose 0.15a ?
I am seeing 180 watts at the output when panel temperature is 50C. That 50C vs 25C is supposed to create a 10% power loss or 23w. So I should see 207w - 1% or 2w = 205w less controller efficiency? I am still missing 25w somewhere (205-180) The controller is supposed to be quite efficient.
