New Dual Battery Installation

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   One of the (many) winter projects is to put in a dual battery system in my 1986 Martinique.

I want a system that isolates the starter battery from the accessories; however I want to be able to link them in parallel if needed to start the boat. I will probably have different capacity batteries of different age.

The obvious way is an isolator switch, however does this charge the connected batteries at ‘one’ unit and over charge the charged battery till the ‘low’ battery is charged.  I have read about voltage sensitive relay and many other ‘gadgets that work.

Can anybody recommend how to do this properly and recommend components.

Thanks

Tom

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must_dash Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: August-27-2011 Location: Lake Maggiore, Status: Offline Points: 223	Post Options Post Reply Quote must_dash Report Post Thanks(0) Quote Reply Topic: New Dual Battery Installation Posted: November-01-2011 at 4:43am
	One of the (many) winter projects is to put in a dual battery system in my 1986 Martinique. I want a system that isolates the starter battery from the accessories; however I want to be able to link them in parallel if needed to start the boat. I will probably have different capacity batteries of different age. The obvious way is an isolator switch, however does this charge the connected batteries at ‘one’ unit and over charge the charged battery till the ‘low’ battery is charged. I have read about voltage sensitive relay and many other ‘gadgets that work. Can anybody recommend how to do this properly and recommend components. Thanks Tom
	1986 Martinique - sold When we ask for advice, we are usually looking for an accomplice.

Randy_in_Ohio Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891	Post Options Post Reply Quote Randy_in_Ohio Report Post Thanks(0) Quote Reply Posted: November-01-2011 at 1:26pm
	Tom, Here is a link to a thread I did when I set up my dual battery system with the Hellroaring isolator/combiner. forget using relays, too much voltage drop, and you would need to have matching batteries. The isolator combiner doesn't need matching batteries, has almost no voltage drop, and If you need to combine batteries in an emergency, you flip a switch under the helm. I have had this set up now for almost 4 years with no trouble and never had a case where I could not start the boat. Hellroaring thread
	1993 Sport Nautique

New Dual Battery Installation

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