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How big of a fuse do ya think?

Old 03-28-2006, 08:48 PM
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Wink How big of a fuse do ya think?

I am just in the process of upgrading my system to about 1500 watts rms / 3000 watts max. I have upgraded the "big 3" and my alternator produces about 180 amps. Two questions:

1. What amperage fuse is sufficient/ideal to use from the battery? Is there a way to calculate?

2. Is it best the fuse each amp after the power distribution block? for example, one amp I have is rated:

Current consumption = 31.0 amps at continous power, 4ohms and
Average current drawn = 7.3 amps at 2ohms.

What sized line fuse would I intall for this amp?

Thanks again for any suggestions & help!!! (I guess it's actally 4 questions)

Last edited by peemoeller; 03-28-2006 at 08:58 PM.
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Old 03-28-2006, 09:01 PM
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your fuse you use on your power wire should be based on how much power the wire you are useing can handle . not how much power you are useing.
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Old 03-28-2006, 09:07 PM
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Originally Posted by RedZone
your fuse you use on your power wire should be based on how much power the wire you are useing can handle . not how much power you are useing.
Thanks RedZone, I have 1/0 gauge running off the battery to the dist block ~ What do you think would be a good sized fuse for this?

After the dist block I have 4 gauge wires running to each of the 3 amps ~ How big a fuse for each of these amps?

Thanks
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Old 03-28-2006, 09:34 PM
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I'd toss atleast around 200 on the 1/0, and about 80-100 on the 4 if you wanted.
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Old 03-28-2006, 09:57 PM
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Explain Fuse?
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Old 03-28-2006, 10:45 PM
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Exclamation

The rule of thumb is to add the fuse values of all your amplifiers together for the value of your main power line fuse.
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Old 03-28-2006, 11:50 PM
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Thanks again Weston, Pioneer Guy & others for the suggestions. So just to clarify Pioneer Guy's statement ~ do I combine which of the 2 below specs?

Current consumption = 31.0 amps at continous power, 4ohms and
Average current drawn = 7.3 amps at 2ohms.

I am thinking for 3 amps (assuming all identical) add 31.0 + 31.0 + 31.0 = 93.0.

So I should install a 40amp fuse in each 4 gauge line then a 120amp fuse from the battery? Does this seem right?

Thanks.

Xiphoid, I don't understand what you want me to explain about using a fuse.
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Old 03-29-2006, 02:06 AM
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The fuse by the battery is simply for the wire itself, not the combined fuse rating of the amps. I have 1/0 and I have a 250 anl fuse on it, and I'm only running a rockford T10001bd, no problems.
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Old 03-29-2006, 02:18 AM
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Originally Posted by Pioneer Guy
The rule of thumb is to add the fuse values of all your amplifiers together for the value of your main power line fuse.
A much better aproach, would be to actually understand what the wire can handle. opposed to just adding up the fuses on the amps. and 1/0's limit is about 350 AMPS...

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Old 03-29-2006, 11:14 AM
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What size fuse should be used after the dist block to the amp? 40 amp?
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