I use one of these panels as a portable.
https://www.windynation.com/Monocrystalline-Solar-Panels
Lives under my mattress when not used. I wired in a pigtail off the controller to the outside storage that this panel plugs into when needed. I have the same type of panel mounted on the roof. Most of the time the roof panel takes care of my power needs, but occasionally being able to have a portable is a nice option to have.
I do know these flexible panels get reviews of not being as durable as glass panels, but I haven't had any issues with mine so I'm happy with my setup.
