Three battery isolator switch plus charging relay.

[muzz]

G'day electronics wizzbangs,

In my boat I have three batteries, one as the crank, two auxiliaries for accessories and 12v electric bowmount.

At the moment I only have the cranking battery connected to the engine, so in turn it is the only battery being charged by the outboard.

My question is;

Can I purchase/manufacture a three way battery isolator switch with an automatic relay that will charge the cranking battery first and then each of the auxiliary batteries?

I know that you can purchase these units for a duel system, but have not come across anything for three batteries. My other option is to just purchase a second duel battery isolator switch and manually change batteries to be charged on the go.

Cheers

Muzz

[aussie123]

I would look at running the 2 house batteries in Parallel and installing a VSR to control the charging.

[Often Debaited]

yep i asked the same question today at work and the anwer is to get a voltage sensitive relay in the mix......look into but also make sure that your outboard can handle it..... some older or 2 stroke o/boards wont do it so thats the first question you need to ask

[muzz]

Cheers fellas,

Yep that\'s what I am after, but more for three individual batteries. I had a duel Isolator / VSR in my previous boat.

The reason that I want it for three individuals is I was told that if one of the batteries in parallel c raps itself then that can destroy the other.

I\'m running a 100hp 4stroke Yammy, should be able to handle it.