2 100W solar panels on the roof won't get you much charging current except in the summer with the sun overhead.
I suggest you consider two things:
-portable solar panels you can orient towards the sun for maximum charge current.
-A MPPT solar controller.
I realize using portable panels more work (set up, storage, cable, etc).
I use one 110W panel on the roof and one portable 110W panel that I can move with the sun, and especially, put OUT in the sun when the TC is parked in the shade.....and a Morningstar MPPT solar controller. Yes, the MPPT controllers get more out of the solar panel than conventional controllers.
If it were me, I'd put my money into solar panels and an MPPT charger than LiFePo batteries. And definitely NOT flexible panels.
https://www.amazon.com/Renogy-Watts-Volts-Monocrystalline-Solar/dp/B009Z6CW7Ohttps://www.morningstarcorp.com/products/tristar-mppt/Hope this helps.
