quick fuse question

coot · Post by **coot** » Sat Apr 07, 2007 7:47 am

so if my amp has 3 30 amp fuses which is 90 does my inline fuse on my power wire need to be at least 90 or would an 80 amp fuse work?

brtnboarder3241 · Post by **brtnboarder3241** » Sat Apr 07, 2007 7:58 am

you should be fine..hell i used a 25 when my amp had 60..dont worry its fine.

loudwagon15s · Post by **loudwagon15s** » Sat Apr 07, 2007 11:11 am

ummm, no, its not fine, i would use about 100 amp

Fishy · Post by **Fishy** » Sat Apr 07, 2007 12:26 pm

The fuse on you power wire isn't really there to protect your amp its there to protect your car from thermal meltdown if you short out your power wire somewhere. Fuse choice depends a lot on what size power wire you're using. Just ordered some 1/0 from Knukonceptz thats rated for up to 350 amps, so theoreticaly I could go as high as that, but for safety purposes its best to go just slightly higher than what your amps are rated for like loudwagon suggested.

In my next install I'll have 180 amps worth of fusing on three Audison amps so I'm using one of these at the battery:

http://cgi.ebay.com/200-Amp-In-Line-Cir ... dZViewItem

Neat thing is I'll be able to cut power to the system by flipping a switch. No need to disassemble anything.

coot · Post by **coot** » Sat Apr 07, 2007 6:28 pm

well taht sucks already ordered my wiring kit from knu got there klm 4ga kit. it comes with 80 amp fuse, would ijust be able to put a 100 amp use in there? will the 80 work as a temporary thing

Fishy · Post by **Fishy** » Sat Apr 07, 2007 7:05 pm

Its says that power wire is capable of carrying 100 amps,

http://www.knukonceptz.com/productDetai ... dID=KLM4BL

but thats it max. I would have felt more comfortable with 2 gauge or the Kollossus 4 gauge(120 amp capability),

http://www.knukonceptz.com/productDetai ... dID=KOL4BL

but you'll probably be OK sticking with the 80 amp fuse. 80 amps is pretty close to 90. Just don't go crazy and get your amp clipping.

With regards to using a 100 amp fuse........ I'm not sold on this new copper coated aluminum stuff. Personally I'd stay with the 80 amp and just don't let anyone else use your system when you're not there.

I had no problem with the "baby" 35 amp fuse in my PPI Pro Mos 2050 until I let a friend borrow my Cherokee. Why does everyone insist on maxing out the bass on h/u's with separate bass and treble controls? I swear some people don't know the difference between noise and music.

Square waves suxxorz.

cargodz · Post by **cargodz** » Sun Apr 08, 2007 2:03 am

If the power wire is capable of 100 amps, then you'll be fine with a 100 amp fuse, as the wire itself (most of the time) is under rated on power and the fuse will "POP" with any surge over 100 amps anyway... So basically what I'm saying is, you'd be better off putting a 100 amp fuse in it :)

swimmerdude · Post by **swimmerdude** » Sun Apr 08, 2007 6:12 am

That 80amp fuse will be fine. SPL guys burp with like 60 amp fuses with thousands of watts. Do they have problems.... no. If the 80amp does pop under normal playing conditions, then yes, you will probably want to move it up to a 90 or 100..... but i doubt that will happen.

cargodz · Post by **cargodz** » Sun Apr 08, 2007 6:18 am

swimmerdude wrote:That 80amp fuse will be fine. SPL guys burp with like 60 amp fuses with thousands of watts.

No they don't Mookie... True spl doesn't use fuses

lol

I was just sayin... If he was worried about it, then I recommend a 100 amp to ease the worrying

Post by **GlassWolf** » Sun Apr 08, 2007 12:32 pm

the 80A is fine.
remember fuses don't blow the instant they see the rated current. fuse ratings are based on % of overcurrent and duration of exposure.
the higher the overcurrent %, the shorter the duration.
http://www.bcae1.com has a "fuses" section that explains all of this very well.

also note most fuses on an amp are rated for the peak output of the amplifier. since you won't likely see the peak output of that amp due to the reactive load of speakers, and the dynamic nature of music, going with a fuse at a slightly lower rating still won't blow the fuse during normal use, since you won't even be using 80A for any extended duration of time.