Angling solar panels will certainly optimise their efficiency but if you have enough of them to be really useful they'll be far too big for that. The best setup I have seen involved building an aluminium frame over the cockpit - a permanent bimini - whose top was all solar panels. It was a 40 ft cat so he had a big area but on a clear day in the Caribbean he was getting a steady 25 amps! if you can afford the cash and space and are heading for the sun it beats any form of generator.