Thread: Two Alternators
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Old 10-21-2017, 12:36 AM   #16
tiltrider1's Avatar
City: Seattle
Country: USA
Vessel Name: AZZURRA
Vessel Model: Ocean Alexander 54
Join Date: Aug 2017
Posts: 1,602
You really should have an electrical plan for the whole boat. In order to come up with that plan you need to know how you plan to use the boat.

If you have no generator and you need to charge your batteries from a single engine, you will want a 100+ amp alternator that uses an external three stage voltage regulator. This allows charging at 14.1 volts.

If you just want to maintain while cruising then an eighty amp single wire alternator is all you will probably need. Single wire alternators have built in voltage regulators and produce 13.8 volts.

There is a lot more to this subject, this is only scratching the surface.
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