250A fuse enough for 1/0 AWG?

[Nevalite 10+ year member]

Hey,

I'm putting 1/0 in for my big 3, i was wondering if 250A fuse is enough or I really need 300?

Thanks

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[ARSkemp 10+ year member]

do you have a ho alt or a stock one?

if its stock it'll be fine...

 

[Nevalite 10+ year member]

Stock Alt, but I was told the type of alt doesnt change anything, its the size of the wire that matters for the fuse.

 

[Racerx250 10+ year member]

it will work until you can get a 300A, pending the kind of wire. Who makes the wire?

 

[Nevalite 10+ year member]

It's Kicker Hyperflex 1/0

 

[ultimate157 5,000+ posts]

do you have a ho alt or a stock one?if its stock it'll be fine...

it will work until you can get a 300A, pending the kind of wire. Who makes the wire?

Blah blah blah you'll never pop the 250 unless you've got a short.

 

[BoomBoomBoy 10+ year member]

Stock Alt, but I was told the type of alt doesnt change anything, its the size of the wire that matters for the fuse.

It does. You always want to underfuse rather than overfuse, unless you like fires.

 

[SPL Blazer 10+ year member]

It does. You always want to underfuse rather than overfuse, unless you like fires.

Don't listen to this guy, he either has no idea what he's saying or he's just trying to be a smartass. What would be the purpose of putting in a fuse under the necessary rating?

The only thing that changes with a HO alt compared to a Stock alt is the amperage output. If your going to run 0 ga wire to your big 3 then you need to add a 300 amp fuse, thats close to what a 0 ga wire is rated for, a 350 amp fuse wouldn't hurt but it's not necessary. If your planning to do competitions then skip the fuse, but if your just building up your street system then play it safe and add the fuse.

 

[bass-aholic 10+ year member]

Blah blah blah you'll never pop the 250 unless you've got a short.

wasn't there just a thread a week ago about some one having a 250a fuse melting and smoking on 0g wire under normal load?

 

[yama168 10+ year member]

Don't listen to this guy, he either has no idea what he's saying or he's just trying to be a smartass. What would be the purpose of putting in a fuse under the necessary rating?
The only thing that changes with a HO alt compared to a Stock alt is the amperage output. If your going to run 0 ga wire to your big 3 then you need to add a 300 amp fuse, thats close to what a 0 ga wire is rated for, a 350 amp fuse wouldn't hurt but it's not necessary. If your planning to do competitions then skip the fuse, but if your just building up your street system then play it safe and add the fuse.

Just curious as to why you wouldnt need a fuse on a competition setup? wouldnt you want it in case you get a short?.

Aloha

 

[SPL Blazer 10+ year member]

Nope, you'll never see serious competitors running a system with any fuses. Look at it this way, your running a single run or multiple run's of 0 ga wire, think of how thick this wire is. Now look at the largest fuse you could buy for this wire, compare the size of the wire and the size of that tiny little strip of metal in the middle of the fuse. Your cutting down on the flow of power from the battery to the amps. If your running your amps for music your not pulling as much power from the batteries and you'll never know the difference, but when your competing that fuse can make the difference between 1st place and 4th place, who really want's to lose.

 

[yama168 10+ year member]

thanks spl for the info.. never really thought of it that way.

Aloha

 

[ultimate157 5,000+ posts]

wasn't there just a thread a week ago about some one having a 250a fuse melting and smoking on 0g wire under normal load?

Read his sig, he's only running 850w

 

[Nevalite 10+ year member]

So 250A fuse won't work? I NEED 300?

Basicly, with a stock alt will that wire ever be seeing more than 250A, I don't think so, so in my mind 250 is fine...Is that bad logic?

 

[ultimate157 5,000+ posts]

So 250A fuse won't work? I NEED 300?
Basicly, with a stock alt will that wire ever be seeing more than 250A, I don't think so, so in my mind 250 is fine...Is that bad logic?

Run the 250. You'll be fine.