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  #1   IP: 70.130.79.247
Old 11-03-2020, 05:51 PM
Juice13 Juice13 is offline
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Realistic constant output from the 55 Amp API alternator?

We have a new Moyer Marine late model A4 in our Tartan with the “normal” API alternator. I assume this is internally regulated.

We have the indigo prop, so the engine is spinning a bit quicker than stock. (Love it).

We have a simple 1-2-B switch but have informally designated Battery 1 (new West Marine 80 ah 12V AGM) as engine start and Battery 2 (old Dekka gel) as house.

Boat is a weekend cruiser with maybe a couple of days strung together on the hook. Would like to extend the charging of the house without directly cooking it with the “dumb” alternator if we motor for a few hours a day.

My plan is to put a DC to DC charger from the start AGM to the House Gel. Renogy, Sterling, Victron, etc have a variety of amperage: a 20, 30, 40 and 50 AMP 12V B2B chargers.

30 AMPS seems like the sweet spot to charge to get some realistic charge put in the house bank (80 ah).

Too much? Would that make the alternator run too hot? I don’t think we ever asked more than a quick recharge after 10 seconds of starting from the alternator. Boat is on shore power 99% of the time with a Xantrex 2 bank set to 3 stage charging.

Comments appreciated on anyone who has pushed the API alternator at a constant amperage on a stock A4.

Thanks
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  #2   IP: 138.207.177.95
Old 11-03-2020, 09:26 PM
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joe_db joe_db is online now
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30 amps is fine, but unless you set up a very unusual custom regulation system there isn't really a way to set some control to 30 amps.
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