Join Date: Jul 2003
Location: On the boat cruising
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Re: Alternator for Volvo MD2030
Using a diode based isolator will allow me to run the alternator with a charge reference controller (I'm planning a VRC-200). I'll take the sense from the house LFP bank to the VRC-200. Then the VRC-200 will cause the alternator to give me voltage appropriate for the LFP bank. The AGM will usually remain mostly charged so the current it draws should be low and the diode will then drive its voltage a little higher.
The last bit of this isn't correct. A diode isolator will have a voltage drop, but won't drive the voltage higher on a connected battery. The voltage will be whatever the sense circuit detects on the house bank.
A combiner or DC-DC charger has limited current passing ability and someday I expect I'll want to upgrade the alternator so I can charge the LFP bank more quickly. This design should still be valid with a higher current (like 150A) alternator.
A start battery is never going to draw more than 120A, so there is no current limit to using a combiner with a high output alternator. The alternator output is connected to the house bank, and the combiner sits between the house and start banks - passing current from house to start as needed.
Manta 40 Catamaran "Reach"
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