Solar Panel Voc-MPPT?
Wondering if there is any relationship between measured Voc and MPPT performance with a 24v panel. My 12v panel has a Voc rating of 21.9 and Isc of 8.2, but I often see 8.2ish when Voc is only 20....
Forum Discussion
BFL13 wrote:
Should be interesting tests!
When orienting, I don't have to run back and forth. The DMM has alligator clips so I can watch the dial while moving the panel--can do it with two hands, don't need more thanks to the clips.
Problem is if Isc is over 10amps--blows fuse in meter. When I had the two 100s at 6.2a each, I had to check just one, not both in parallel.
Once I then connect back up, now I have to run to the Trimetric to see what it says compared with the Isc I just saw at the panel.
Only have to do that once in a while. Once set up and you see you get rated Isc when you should, you can assume the lower amps you get at other times will be the most you could be getting just then.
Now I am wondering if I could just double the Isc and keep using the same marker. My panel Isc is 8.3. 230w/13.5 = 17 so that's going to be my expected amps? Twice 8.3 is 16.6
So ignoring the variable battery voltage, I might just say if I am not getting twice whatever Isc is , then something is wrong? Say I got 5a for Isc, then I should see 10a on the Trimetric? If not, then something is wrong?
What is a "DMM"? Some kind of meter? Sorry, acronyms are too vague at times. How did you get alligator clips for your DMM?
