Matching amps with battery fuse...

[2010HHRUMADBRUH 10+ year member]

Hey everyone. Installing a system in a jeep cherokee and the guy has a 800w rms pioneer sub amp with dual 40 ampere fuses, and an alpine 4 channel that has dual 20 ampere fuses. I am leaning toward 100-120 ampere fusing at the battery. Would this be ok?

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[NASTY08IMPALA 5,000+ posts]

Hey everyone. Installing a system in a jeep cherokee and the guy has a 800w rms pioneer sub amp with dual 40 ampere fuses, and an alpine 4 channel that has dual 20 ampere fuses. I am leaning toward 100-120 ampere fusing at the battery. Would this be ok?

u fuse for wires amperage capability not for the amps fusing ....contrary to popular belief u are protecting the wire not the amp

 

[NASTY08IMPALA 5,000+ posts]

so if ur using 4ga cca fuse at 100..4ga ofc 150 .1/0 cca 250.. 1/0ofc 300 ..although most of this new 1/0 oversized cca is rated at 300 also

 

[thatguy12 10+ year member]

ive always just added the number at the battery. and if using a distro block i always get a fused one and use fuse size thats on each amp that the wire is running to. im a noob but i still have yet to blow anything up.

 

[thatguy12 10+ year member]

so if ur using 4ga cca fuse at 100..4ga ofc 150 .1/0 cca 250.. 1/0ofc 300 ..although most of this new 1/0 oversized cca is rated at 300 also

but say your using zero gauge but you only have a 1000 watt amp. wouldnt that render the 300 amp fuse useless if my amp could never draw that much power?ive always heard use similar fuse that your amp has.

 

[2010HHRUMADBRUH 10+ year member]

so if ur using 4ga cca fuse at 100..4ga ofc 150 .1/0 cca 250.. 1/0ofc 300 ..although most of this new 1/0 oversized cca is rated at 300 also

Call me crazy, but I have a 250 amp fuse for my stock electrical, just cause that's what I had, lol. I don't ghetto rig my stuff and never had a single battery fuse pop.

But the wire is "4awg ofc" although it's copper colored and is real flexible...I think it was $40 on ebay.

ive always just added the number at the battery. and if using a distro block i always get a fused one and use fuse size thats on each amp that the wire is running to. im a noob but i still have yet to blow anything up.

Well the amplifiers are fused themselves, so I don't see a point in fusing more than at the battery.

 

[NASTY08IMPALA 5,000+ posts]

but say your using zero gauge but you only have a 1000 watt amp. wouldnt that render the 300 amp fuse useless if my amp could never draw that much power?ive always heard use similar fuse that your amp has.

yes it doesnt matter you fuse for wire not the amp ..u are fusing to protect the wire

 

[naughtyca 10+ year member]

you also have to account if your sub amp does not have a built in fuse

 

[2010HHRUMADBRUH 10+ year member]

yes it doesnt matter you fuse for wire not the amp ..u are fusing to protect the wire

Because that wire can handle up to 300 amperes, right?

 

[NASTY08IMPALA 5,000+ posts]

Call me crazy, but I have a 250 amp fuse for my stock electrical, just cause that's what I had, lol. I don't ghetto rig my stuff and never had a single battery fuse pop.
But the wire is "4awg ofc" although it's copper colored and is real flexible...I think it was $40 on ebay.

Well the amplifiers are fused themselves, so I don't see a point in fusing more than at the battery.

u dont wana run a 250 in 4 gauge u want 150.

 

---------- Post added at 12:34 PM ---------- Previous post was at 12:33 PM ----------

 

you also have to account if your sub amp does not have a built in fuse

no u dont ...once again u are fusing for the wire not the amp

 

---------- Post added at 12:34 PM ---------- Previous post was at 12:34 PM ----------

 

you also have to account if your sub amp does not have a built in fuse

no u dont ...once again u are fusing for the wire not the amp

 

[NASTY08IMPALA 5,000+ posts]

Because that wire can handle up to 300 amperes, right?

yes all my 1/0 cca is oversized so all my fused runs are @300

 

[thatguy12 10+ year member]

Call me crazy, but I have a 250 amp fuse for my stock electrical, just cause that's what I had, lol. I don't ghetto rig my stuff and never had a single battery fuse pop.
But the wire is "4awg ofc" although it's copper colored and is real flexible...I think it was $40 on ebay.

Well the amplifiers are fused themselves, so I don't see a point in fusing more than at the battery.

there isnt a point to fuse the distro besides i get piece of mind, im weird. and incase you ever get a second battery you wouldnt have to buy more fuse blocks. i try to think of future upgrades too save future money lol.

 

[2010HHRUMADBRUH 10+ year member]

u dont wana run a 250 in 4 gauge u want 150.

My 250 amp fuse is for my 2' run of 1/0 OFC. It's about 8" from terminal to fuse holder, than about 12" to the amp input (I'm lucky having the battery in the back)

 

[NASTY08IMPALA 5,000+ posts]

My 250 amp fuse is for my 2' run of 1/0 OFC. It's about 8" from terminal to fuse holder, than about 12" to the amp input (I'm lucky having the battery in the back)

ok thats fine but for the 4ga ofc u wana use 150..thats what i use for my 4ch

 

[naughtyca 10+ year member]

wow my mistake, so if you are using a 4ga wire and your amp recommends a 200a external fuse, you still use 150a? or do you need to up your 4ga wire?