We have a 75w solar panel this time fitted by the dealer but in past by Solar Solution. We also have a battery master/mate so that it also keeps the dase vehicle battery topped up. It means we can wild camp/stay on rally sites without hook-up for longer. We also have 2x85amp batteries (though they needed replacing recently, not sure if it was a battery fault or the use of satellite tv with inverter?) Would have preferred a 12 satellite receiver really. I would say on balance it is worth having.