We''ve had boats that were all 12v and boats that had an inverter
with most everything but the cabin lights
using 120v. Life is MUCH easier with the 120v setup and a good sized inverter
. We have a 2500 watt unit that powers hair dryers, microwaves and inflatable boat pumps
also knows to shut off if you''re using too much juice, so you''ll be able to start your engine again. We use the Heart Interface and have never had a problem with it. It may not be the answer to your question, but that''s our experience.