We've been rocking a hybrid roof-top/portable solar system for several years now. Having the flexibility to either use the panel fixed on the pop-top roof, or to unlock it and move it for better sun exposure has been excellent.
With our original 60w panel and an inexpensive PWM controller, we had a great budget solution, but it struggled to keep our house battery fully charged when the loads were high. (Usually hot days in the desert when the fridge works hard)
