Bill .....
I am choosing to run two 120W flex panels on the roof in parallel, starting from scratch, in my Grandby Shell. May run a third one if it is necessary. I chose parallel because it simplifies running a 100W flex fold portable from the back wall plug. It remains plug & play if my roof is parallel. It is my understanding, if your roof is in series, your back wall plug has to be run through a separate controller than your roof. You do not get the voltage upgrade, but positioning a portable for Sun at camp, with less components & wiring, appealed to me. But in the end, bottom line AH input into my battery storage, is what matters to me the most. Does 300W @12V in parallel, equal AH achieved, comparable to 100W (200W of panels) @24V in series? Is voltage trade off measurable in that regard?
I’m dense with this stuff, so apologies ahead .....
Mark