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post #19 of Old 05-04-2019
colemj
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Re: Alternator for Volvo MD2030

Most FET-based isolators have a circuit that puts a low-current battery voltage on the alternator input so that the alternator can see a voltage to start with. If you are buying one, make sure it has this feature and wire the circuit to your house bank.

If you use a diode isolator, wire the sense to the house bank output terminal.

If it were me, I'd just run the sense wire directly to the house bank itself, unless the wire run distance between the bank and the isolator is short with little voltage drop.

Curious as to why you are going with an isolator instead of a combiner. I have been assuming you are charging a main house bank and a small start battery. With a combiner, you would not be holding the start battery at a high voltage for a long time waiting for the house bank to fully charge.

Mark

Dolphin 460 Catamaran "Reach"

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