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Home > Visual / Audio Mods > Audio FAQ/Help > ????Power wire Fuse HELP???

????Power wire Fuse HELP???

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JRod_TC
Burke
Virginia, US
  • Scion Guru
 im setting up my system and i have to go buy a fuse holder and fuse to put on my power wire.. how many amp fuse would i use for a 400 RMS amplifier??
[#] Sep 25, 2008 02:37pm
FrAnkRYzzO
Perry Hall
Maryland, US
  • $upervillain
    for Hire
 Check the amp's manual and look for its maximum current draw. That is the size fuse you will need. It will probably be around 50-60 amps.

...............

Search or one of these adorable kittens WILL DIE!
[#] Sep 25, 2008 03:15pm
JRod_TC
Burke
Virginia, US
  • Scion Guru
 I dont have the manuel...old amp...

amp stats

TT2200
MOSFET 2-Channel Power Amplifier
Max Power (2 ohms) : 200w x 2
RMS Power (4 ohms) : 100w x 2 @ 0.04% THD
Bridged Power (4 ohms) : 400w x 1
Signal-to-Noise Ratio : 102dB
Frequency Response : 20Hz-20kHz
Dimensions: : 14-3/4"L x2-1/4"H x 11-3/4"W



[#] Sep 25, 2008 03:18pm
FrAnkRYzzO
Perry Hall
Maryland, US
  • $upervillain
    for Hire
 I'd go with a 60 to be sure, but if you ask 07sctc he should be able to give you a more definite answer.

...............

Search or one of these adorable kittens WILL DIE!
[#] Sep 25, 2008 03:26pm
JRod_TC
Burke
Virginia, US
  • Scion Guru
 60 it is
[#] Sep 25, 2008 03:42pm
falkore24
New Jersey, US
  • Vehicle Designer
 the power fuse is protecting the wire. The amp has it's own fuses on it.

400/12 = 33.333 Amps Output

Assuming 80% efficiency, you need at least 41.67 Amps of power.

A 50 or 60 Amp fuse is fine. I'm assuming that you have 4ga wire?

If so, anything above the amps needs and below 100A is fine.

[#] Sep 25, 2008 04:22pm
JRod_TC
Burke
Virginia, US
  • Scion Guru
falkore24 wrote:
the power fuse is protecting the wire. The amp has it's own fuses on it.

400/12 = 33.333 Amps Output

Assuming 80% efficiency, you need at least 41.67 Amps of power.

A 50 or 60 Amp fuse is fine. I'm assuming that you have 4ga wire?

If so, anything above the amps needs and below 100A is fine.


I appriciate the input!!! I'm hitting up best buy after work, then home for the install. I am running 4gauge power wire..

How important is it for the ground to be 4 gauge?

[#] Sep 25, 2008 04:36pm
JRod_TC
Burke
Virginia, US
  • Scion Guru
falkore24 wrote:
the power fuse is protecting the wire. The amp has it's own fuses on it.

400/12 = 33.333 Amps Output

Assuming 80% efficiency, you need at least 41.67 Amps of power.

A 50 or 60 Amp fuse is fine. I'm assuming that you have 4ga wire?

If so, anything above the amps needs and below 100A is fine.


I appriciate the input!!! I'm hitting up best buy after work, then home for the install. I am running 4gauge power wire..

How important is it for the ground to be 4 gauge?

[#] Sep 25, 2008 04:36pm
JRod_TC
Burke
Virginia, US
  • Scion Guru
 damn double post

half an hour to go!!!

[#] Sep 25, 2008 04:37pm
FrAnkRYzzO
Perry Hall
Maryland, US
  • $upervillain
    for Hire
 You should use the same size ground as the power wire, and make sure it is no longer then 3 feet. You want the ground to be as short as possible.

...............

Search or one of these adorable kittens WILL DIE!
[#] Sep 25, 2008 04:39pm
falkore24
New Jersey, US
  • Vehicle Designer
 I usually run a larger ground than power lead unless the wire can handle a significant amount more power than I'm using .... this is the case since you are using half of the wire's capacity.

So 4ga. power and ground. Ground as short as possible as mentioned.

[#] Sep 25, 2008 04:49pm
JRod_TC
Burke
Virginia, US
  • Scion Guru
 Where did you guys ground?? i heard the best place is under the passanger seats or close to the spare tire.

[#] Sep 25, 2008 04:51pm
FrAnkRYzzO
Perry Hall
Maryland, US
  • $upervillain
    for Hire
 I grounded under the rear seat. Sand the metal bare in the spot you want to use and then you can drill a hole or use a self tapping screw. Try to use metal as conductive as possible for the washers with enough surface area to make maximum contact with your grounding ring.

...............

Search or one of these adorable kittens WILL DIE!
[#] Sep 25, 2008 08:17pm
07sctc
South Carolina, US
  • Chief Mechanic
 if it is a glass agu fuse then i would go for 80amp since you are running 4 gauge wire. if you are getting an anl then 100amp would be about the highest you can go.

a 4 gauge cable can only carry ~150 amps before the cable starts to heatup and cause other problems.

if it were me i would get and anl fuse holder and 100 amp fuse and be done with it. the only thing the fuse is doing is to keep a short to ground, either from the power wire getting pinched or the amp having an internal short, from directly tying the positive of the battery to ground and possibly ruining your battery or starting a fire.

if you go with too small of a fuse you will be creating a bottle neck in the current flow path that will starve the amp and cause you to go through a lot of fuses because of the constant heatup and cooldown of the fuse itself. too large of a fuse will cause your cabling to heatup.

a good rule of thumb is add up the fuses in the side of the amp and double it. that way as long as the wire can carry that amount of current then you will be protected from a short to ground and also not starve your system of juice.

as far as the ground wire the best thing to do is find a nice spot around the spare tire area and drill a hole through the metal. scape all the paint off in the area and use a bolt through the body to hold the ground terminal in place. you dont want to let it get loose! this is what i usually do plus i use a torch and solder the ground connector to the car body so that it cant come loose. the better the connection, the less resistance you will buildup in the connection which will = a higher voltage at the amp even if just .1 of a volt.

hope this helps man!





beware of the mad sciontist !

ask me your car audio and electronics questions!!
[#] Sep 25, 2008 08:46pm

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