45 amp breaker?

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Originally Posted by brettw

Thanks Kevin,
It actually doesn't say what size.
It does call for #2 or 4 wire, which seems like overkill.


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6awg should be plenty if you are running less than 10'.

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Originally Posted by artcarney_agr

I'm confused, what does the battery charger need a breaker on the boat for?

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If there is a short, the breaker pops and keeps the charger and battery from exploding and lighting your boat up like a 4th of July bonfire. Should be a 50A breaker on every positive lead right before your batteries, unless you have something that draws or adds more than 50A (huge battery charger or trolling motor), then use the correct size breaker.

Note* a breaker does not remove the need for each item to be properly fused as well. The breaker is just to keep from having a boat fire because of a direct short in your wiring due to rubbing, mice, heat melting wires, etc.

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Originally Posted by Kevin22

If there is a short, the breaker pops and keeps the charger and battery from exploding and lighting your boat up like a 4th of July bonfire. Should be a 50A breaker on every positive lead right before your batteries, unless you have something that draws or adds more than 50A (huge battery charger or trolling motor), then use the correct size breaker.

Note* a breaker does not remove the need for each item to be properly fused as well. The breaker is just to keep from having a boat fire because of a direct short in your wiring due to rubbing, mice, heat melting wires, etc.

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I still don't understand this. If the charger has a problem, shouldn't the breaker for the wall outlet pop?

Its std to have a breaker in wire in pos+ wire going to Trolling motor..To protect wiring in that circuit that feeds TM...50amp + - is pretty common...
A breaker in wire of charger input or output is (unheard of by me).. Your home /barn/shed wiring already has a breaker (in 110vac ) Probably a 15a-20a in that outlet that you plug your charger into thats to protect your home/barn/shed wiring ..
Hope this clears up something...

Thanks again,
It will get a 50, ordered already

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Originally Posted by artcarney_agr

I'm confused, what does the battery charger need a breaker on the boat for?

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This is not a charger that would be packaged with a boat. Its external, smart charger.
I will get the black wire wrapped. Dont worry. Attachment 340164

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Originally Posted by cva34

Its std to have a breaker in wire in pos+ wire going to Trolling motor..To protect wiring in that circuit that feeds TM...50amp + - is pretty common...
A breaker in wire of charger input or output is (unheard of by me).. Your home /barn/shed wiring already has a breaker (in 110vac ) Probably a 15a-20a in that outlet that you plug your charger into thats to protect your home/barn/shed wiring ..
Hope this clears up something...

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Yes, but this charger calls for one on the + wire near battery so i will install it

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9$ is cheap insurance on a 10k boat and 40k barn

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Go to Walmart, get a 50 amp self resetting breaker in boating dept for around 8.00 put on a short lead at battery and be done with it. Charger be happy, you be happy.

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Originally Posted by brettw

This is not a charger that would be packaged with a boat. Its external, smart charger.
I will get the black wire wrapped. Dont worry.

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What an odd duck. I see it has fuses on the panel.