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....
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red31 wrote:BFL13 wrote:
Should be interesting tests!
Now I am wondering if I could just double the Isc and keep using the same marker.
I hope you use the same marker to compare your 12v PWM system to 24v MPPT.
What if the 230w panel was 12v?
So if you had 2.3 x 100 w panels @ 6.2A*2.3 = 14.26A Isc, if you had 12v 230w panel you'd expect 14.26A @ 13.5 = 192.5 watts/230 watts (84%).
Now with a 24v panel/MPPT you'd expect 95% or 218.5/13.5 = 16.2A.
That's pretty much the max I've seen at 16.25 and 212w noon time at altitude. With the 13-14a I seen then straight off the panel I would have thought I'd get more but I don't think the voltage/watts are there to go higher. The real benefit on MPPT is early in the morning when the amps are low but the voltage is up and I see 10a at 6am, 14a at 7am. By noon I'm in float and the higher PWM numbers run the TTs loads all day.
A heads up on the Eco-worthy. I did find a video from someone having issues with his over heating. He has it flat mounted inside and even had it shut off. His answer was to use a few 1x1 pieces to mount it off the wall and get some air moving behind it.
