New results when at estimated STC today and with cool panel and ambient temps.
Blue sky, no haze, ambient 13.5C and panel at only 35.2C. As usual ran loads to keep battery voltage in the 12s for the test. Panel Isc was 8.5 (rated at 8.3 so IMO at STC for insolation)
INPUT- (numbers jumping around probably due to MPPT action, but these seem to be about the middle values to go together)
29v x 7a = 203w
OUTPUT- 12.5v x 15.84a = 198w
Calculation: 203-198 = 5 and 5/203 = 2.5% so efficiency 97.5%
I am guessing the cooler ambient temperature accounts for the higher controller efficiency than last test. I don't have a temp vs efficiency curve to compare with (anybody?)
There is obviously nothing wrong with the Eco-Worthy controller as such, so there goes the last refuge for the controller snobs to find comfort :)
That leaves the panel temperature as the big culprit in the summer when I was getting 13.5a at 51C panel instead of today's 15.8a at 35C panel. There is no cure for that unfortunately.
Also I don't know why I was getting 203w instead of 228w at est STC today. My line loss panel to controller is only 1% (2 from the 230)and line loss from controller to battery measures 0.02% at the 15a (ie no loss of the OUTPUT watts) Perhaps not really up to STC today?
