Hi Allan, good to see you still looking in. As you know I have a modest couple of solars, (total 60w), and an Airbreeze. What is adequate depends on where you are, in that some marinas don't like wind greenies on in power mode because it annoys nearby liveaboards. Also what is left on. As mentioned above, if nearly everything except auto bilge pumps are off, then it does not take much, and one decent, (eg 40 to 80w solar panel, or an wind genny if you can leave it charging would easily do. If like me you also like to leave the frig on, then it takes a bit more at times, although a combination of both works, as that's what we are using when out on the pick. In the marina, I also use a Ctek marine 200 charger, so can leave the wind genny off, because our marina is one of those mentioned. The other advantage of a smart charger is it's ability to due sulphate and recondition your batteries. However, if you could run a wind genny where she is moored, then a panel or wind genny would cope with just batt top up, unless you want to leave a frig on, both would be best. Must one waring re sitting a panel on the Bimini. Ok if it is a rigid material, not so good if canvas, as they do chafe.