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post #10 of Old 07-11-2008
sailingdog
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Basically it is a relay that closes when it detects charging level voltage on one of the two sides. Some will only detect charging level voltage on the primary side, and need a sense wire connected to detected it on the secondary side. Others, like the newer ACR that is squarish, will automatically detect it on either side.

They're very convenient in that you can start your engine and as soon as the alternator output is detected,it will combine the batteries so that both banks are being charged while the alternator is running, without you having to do anything. This makes it far less likely that you'll leave the main battery switch in the "BOTH/ALL" position and kill both battery banks when you're sitting at anchor after the engine shuts off.

Quote:
Originally Posted by rocinante33 View Post
I'm a bit lost here with the missing piece. What is an ACR?

Sailingdog

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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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