Hi Richard, we have a 100watt solid panel on the roof on two purpose made bars that allow the sunroof to slide under. We have a really good quality regulator bluesolar 75/15 MPPT which is most important.
It keeps our 360ah battery bank charged when we are off grid, and running fridge, TV etc. We do have led lights and that helps big time.
Can send some pics next time we are down at boat
Have a great Christmas everybody