But bear with me.
I am posting here AND ONLY HERE for all the right reasons. Those of us who float about multiple forums are here as well, hopefully most of the riff-raff isnt.
I did a little experiment the other day and thought I would share it.
In the long-term process of increasing solar panels, wiring needs to be heavier, controllers changed, etc, etc, its a fairly large task resulting in an increase from 900w to around 2300w input. Doing it in stages. we will soon be ditching the 2 x 30A Tracer MPPT controllers (too small) and going down the Dingo route.
The Tracers were each configured with strings of 3 panels to 450w in series, input around 56V.
As a fun afternoons play, muggins here decided to swap 1 string to parrallel.
So now we have a mirror image of solar panels on the same bus roof with the same length set of wires, same controllers, etc, running into the same 12v battery (but sensed at each end of the battery to limit argument between the controllers, an issue fixed some time back.) in the same sunshine or shade, whichever the case.
Now 1x MPPT Tracer has 56v going into it and the other has 18v. To be fair, the wiring for the 18v option would be considered marginal in sq. area.
Guess which string gives more amps (consistantly, at least an amp more into the battery at any given time)
NOT the higher voltage series one!!! 
But basically the same readings as shown. Didn't do the direct couple thing, perhaps another day.
