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Old 23-05-2019, 07:30   #16
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Join Date: Aug 2011
Location: St Augustine
Boat: '87 Irwin 43
Posts: 198
Re: Dead start battery...

Originally Posted by billknny View Post
My boat has a single (12V) start battery, and eight Group 31 batteries that make up the 24 volt house bank. There are NO connections between the two systems at all--switched or not.
My setup is basically the same....start battery isolated from house bank via two single circuit battery switches (ON - OFF only) that both feed a Blue Sea 7610 SI-ACR to ďcombineĒ for charging but isolate for use.

Have jumper cables but considering upgrading from the current setup to one without jumper cables (damn, where did I put them...).

I generally prefer the simplest system to do the job...automatic ACR switching, 1-2-BOTH combiner switch or the momentary switch...pros and cons of each?

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Old 23-05-2019, 07:38   #17
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Location: Tampa Bay area, USA
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Re: Dead start battery...

Because of the amperage a house/start battery bank connection may require to actually start the engine, we chose to make the connection through a solenoid activated by a relatively lighter weight Blue Seas momentary switch. It makes the wiring much more simple both for the switch itself and for the connection between the batteries.


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Old 23-05-2019, 07:47   #18
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Re: Dead start battery...

As long as the solenoid (actual contactor) is rated for high transient amps.

If using the ML ACR then that functionality is built in.
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Old 24-05-2019, 09:18   #19
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Re: Dead start battery...

1 2 Both switch.

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