Any large capacity alternator with a 'smart regulator' will work.
My direct experience is of two Balmar 110 A Alternators with the Balmar smart regulators. These are OE on Island Packet Yachts.
Apart from some belt dust/slip issues with the standard vee belts, cured by using genuine Gates belts with notched inners and careful belt tensioning, the Balmar Alternators and smart regulators have been without issue. Fifteen years total use on two well used vessels.
Balmar Alternators are finished with a corrosion inhibiting paint, apart from that they appear normal externally.
