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:ktmrfs wrote:
OK, I've completed my posting of results from my testing under the title of
Answering some solar panel with MPPT controller ?
While I'm looking forward to comments, PLEASE PLEASE DO NOT turn it into another MPPT vs. PWM discussion!!
All I tried to do is answer some MPPT questions, not advocate one or the other.
From the other post (great one!) it appears there are two trailers and one portable set of panels and one trailer has PWM and the other MPPT. While camping more solar is desired whichever trailer is taken camping. JiminDenver has one trailer, two battery banks, two arrays but one controller so he is also a candidate for the following:
IMO you could have the controllers also portable between trailers and you could have two sets of portable panels. Each controller can go on whichever battery bank (whichever trailer) and whichever panels (as long as they match) and add their amps.
I have my controller(s) fitted with four pigtails (two array, two battery) each with an alligator clamp. This allows the controller to be attached to any battery bank, then to any set of array wires quickly and easily and swapped around too. (All in a 5er's front bay, so out of the rain--with a TT you would need a shelter)
In our case it is all in the one trailer since both battery banks (separate) are in the front. Got one 230w 24v array and the other is a 130w 12v array each with its own controller. I can have the controllers each on its own bank, both on one bank, and any controller on any bank depending on which bank needs charging the most at the time) Max flex.
In my crystal ball, I see something similar is possible here, just needs the second array in one case or the second controller in the other.
My setup originally was similar to your idea. It does work well. One thing I did, instead of using aligator clips, I installed 50A anderson connectors on both trailer tongues going to the battery banks and pigtails to the controller and panels with anderson connectors. Made a very quick, easy and robust connection to the batteries. I'm forever knocking alligator connectors loose. Also use anderson connectors on all my extension cables.
50A Anderson connector
