Fuses

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=21439
Printed Date: May 23, 2024 at 12:14 PM

Topic: Fuses

Posted By: domiyork809
Subject: Fuses
Date Posted: November 13, 2003 at 6:08 PM

What is the rule of thumb when trying to determine the right fuse rating for a component? 20 % over the rating.

Thanks.

Replies:

Posted By: Ketel22
Date Posted: November 13, 2003 at 6:22 PM

i normally use 10amp for every 100wrms output of the amp

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Posted By: domiyork809
Date Posted: November 13, 2003 at 6:41 PM

Thank you.

Posted By: bberman1
Date Posted: November 13, 2003 at 7:24 PM

If you use ohms law https://www.the12volt.com/ohm/ohmslaw.asp you can calculate the correct fuse size. watts divided by volts = amps, so if you have 1000 watts rms and a voltage of 12.8 you will be drawing 78.125 or 78 amps. So you would need a fuse of 80 amps for 1000 watts rms. You can use the 12 volts calculator ( I = P / E ) https://www.the12volt.com/ohm/page2.asp . Also you should never overrate a fuse. The fuse needs to be as close to the current draw as possible to correctly protect the component(s).

Posted By: Ketel22
Date Posted: November 14, 2003 at 12:52 AM

yeha, im sry, its about 8amps per 100wrms. my mistake havent had to get a fuse in a while sry.

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