I've just gone through as similar exercise to increase my charging capacity. I jumped back and forth from generator to bigger alternator to second alternator. I'm not sure how your boat is set up but it is usually possible to add a second alternator to the PTO pulley on the engine if there's room. You'll need a dual pulley for anything over 120 amps. You might also consider AGM batteries which have a much higher acceptance rate then flooded.
In the end I went with a 160 amp replacement for my standard alternator using a serpentine belt kit. There may be one available for your engine which should allow up to a 180 amp alt. I also have 660 amp hours of AGM house and 370 watts of solar. We have DC refrigeration and a watermaker but still only use maybe 100-150 amps per day. No washing machine.
S/V Second Jump
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