What I did 'cause I thought we needed 110 AC on the boat was replace my 30 amp charger with a 2000 watt inverter charger capable of 100 amps DC. Turns out that unless your golf carts are dead flat, they won't accept more than 50 amps or so. Very glad I didn't spend the money on a 100amp alternator and 2 belt pulleys.
All the experts suggest not running your battery bank below 50 % of capacity. Same experts say it takes for ever to reach 100% charged. ? Can you live with the 30% between 50 and 80? To support my new electric windlass, I added 2 golf carts under the v berth for a total of 6 and 600+ AH. 30% of that is 180+ AH, about 3 days for me. If anchored for longer, I run my Honda 2k for one tank of gas, about 3 hours, and put 100+ AH back.
Like Maine Sail, I enjoy quiet evenings, so I run my generator afternoons, maybe 1 to 4
It is our experience that a day's motoring with a 50 amp alternator charges the bank to 100%.