thanks,
i am looking at getting some mono/poly panels. the battery bank will be 24v (possibly 48v in the future). i want to get 24v panels to avoid having to have them in series (unless i went 48v later). my concern is that if i buy a few panels now, w/ a certain rating, and then can't find the exact same ones later when i add on, i wasn't sure how they would interact if the volts/amps varied.
so if i have (3) 24v panels, they would be combined at the charge controller. if all panels were 100w but varied in voltage/amperage, 20v/5a, 21v/4.75a, 19v/5.25a....would this provide a simple 20v at 15 amps, or something less due to one panel having low amps and one having low volts?
i guess it's also a matter of panel deterioration over time, not just a initial matching issue. if one panel starts losing power faster, in series, it would drag all the others down with it, but does it affect the other panels in parallel?