If you wanted to, I don't see why not. Just intercept the DC before it hits the inverter part of the controls and install a voltage regulator.
If you're only dealing with 12V batteries, would it be easier to run a car alternator off of a small, efficient gas diesel engine?
I'd suggest jumping on YouTube and looking for videos on how to accurately check these cells. Off Grid Garage has some great videos, but I caution not to get caught up in the shit he tries to sell. Or any YouTuber for that matter.
Each PV input of the 6548 (and there are two of them) have a max 4000W and 250V input. That comes out to 16A.
It has been shown that the 6548 will take a hair more than that and that is why I said it will clip at just over 17A.
OP, you might get lucky and produce just enough voltage with the...