how many watts can a 80 amp agu fuse hold?

[savagebee 10+ year member]

yea man i for got. i searched but nothing came up about what it could hold.

no you didnt, at least not well

 

[ultimate157 5,000+ posts]

If a fuse that is rated 80 amps allows more than 80 amps for any extended duration, well, ya might have to use that pretty fire extinguisher.
Umm, in a sense, yes they do allow current to flow. But they also stop the current too! I think the term "Overcurrent protection device" explains what I mean.

An 80A fuse doesn't blow exactly at 80A of current draw. It'll allow quite a bit more in the event of a short until it heats up enough to melt.

 

[lostdaytomorrow 10+ year member]

P = I * V

P = Power

I = Current

V = Voltage

Don't forget efficiency is never 100%.

 

[expo5.0 10+ year member]

for those who feel like arguing about it- continue. for the op-

the best answer for you is- what is the recommended fuse size for you amp? what is the recommended fuse size for the power cable size you are running? (use whichever is smaller). Use a search if you can't find any of that information.

 

[Kastlez_ 10+ year member]

I Did the math and i'm looking at 3,000watts

is that way too much considering i have only 1500max running on it?

250a fuse + 1500rms amp

1/0awg wire

suggestions

 

[expo5.0 10+ year member]

if you have 0 guage cable and a 1500 max power amp an 80 amp fuse is too large for the amp but not for the cable- that said, it's probably fine

 

[n2audio 5,000+ posts]

more important than efficiency is music's crest factor.

An efficient class D amp that can produce 1000w rms at 14v on a test bench playing 0dB sine waves at full volume will draw around 90A.

That same amp playing music at full volume will draw 20-30A rms.

An average class a/b amp capable of 1000w would draw around 120A for tones, 30-40 for music.

 

[Einzee 10+ year member]

An 80A fuse doesn't blow exactly at 80A of current draw. It'll allow quite a bit more in the event of a short until it heats up enough to melt.

more than 80 amps for any extended duration,

I totally understand. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[SethPhillips 5,000+ posts]

i usually match the wire with the current demand and install the fuse according to the current draw of the amp.. so if the amp has a 150 a fuse i run either 4ga or 1/0 depending on the length of the car.. and install a 150a fuse under the hood..