Thread: 45 amp breaker?

Originally Posted by Barnettcrew

Is this going on a boat? It didn’t look like it was made for a marine environment. But maybe I’m missing something. With that said, I’d use the following circuit breaker if I were in your shoes. This breaker is only to protect the battery in case of a short on the cable from the charger to the battery. The charger should have built-in fuses to protect it, but the battery would be unprotected unless you add the other circuit breaker. This looks like a single battery setup. If I’m missing something and it’s for multiple batteries, you’ll want a circuit breaker on each battery. Just my two cents...

attwood 7623-7 Compact 50-Amp Marine Boat 12V/24V Circuit Breaker https://www.amazon.com/dp/B00BV89QXW..._XpsVCbF9Z38JJ


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Hi
Yes on a boat but should be well protected.
Its a 2 battery setup in series equaling 12 volts.
I would think one breaker on the positive wire would be enough?

Thanks for your reply.



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

Originally Posted by artcarney_agr

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

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.

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.

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

Originally Posted by artcarney_agr

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

It depends on the problem. If the charger had a fault that increases the current draw above the 15 or 20 amp house/shop circuit breaker while plugged in and charging, then yes it will trip that breaker.

If the short happens on the output side of the charger, it’s possible that the house circuit breaker wouldn’t react in time to prevent damage to the charger. That’s why they add the fuses on the output.


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Originally Posted by artcarney_agr

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

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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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.

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

Originally Posted by artcarney_agr

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

The fuses protect the charger from damage in case of a short in the output wires. The breaker will protect the battery from damage in case of a short on the input wire. Remember, the battery and the charger are both sources of power. Therefore a direct short on wires leading to either will send power directly to the boat chassis or other wires. That is why each power device is required to have protection (fuse or circuit breaker).


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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...

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...

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

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