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Old 01-06-2021, 11:27 PM   #41
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City: Gloucester, MA
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Originally Posted by woolf View Post
Attached the spec sheet for the APS 55i we installed.

Thanks. I hadn't heard of APS before. It's a bit hard to tell, but they seem a bit like Balmar, packaging up stuff for specific applications. My guess is that like Balmar, they are more or less stock LN alternators. Their 42i sure looks a lot like mine... Nothing wrong with that, just not likely to yield any magic with respect to efficiency.

Interestingly, their "large frame" alternators are 50% efficient, your 55i is listed as 87%, and the 42i is 70%. That's quite a spread. I also expect the efficiency number in the data sheet is best case since it is otherwise unqualified.

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Old 01-07-2021, 04:42 AM   #42
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The APS 55i was installed on Volvo Ocean racers, where efficiency and low weight is paramount. That's how I found them, and they looked like a good fit for our application.
I bought them from Bruce Schwab at OceanPlanet Energy in Bath ME, who is doing some interesting electric installations, mainly on sailboats.


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855, alternator mount kit, belts, cummins, pulleys

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