current draw amp
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=26309
Printed Date: July 15, 2025 at 12:47 PM
Topic: current draw amp
Posted By: orionmeades
Subject: current draw amp
Date Posted: February 11, 2004 at 9:09 PM
hello all i have a orion 150r amp. it has 4 30 amp fuses. what i need to know is what is the total current draw for this one amp. the total power is 1200 watts for the amp...any help will be gladly welcomed. thanks orion
Replies:
Posted By: bfog99
Date Posted: February 11, 2004 at 9:14 PM
if i understand this right, you take the RMS divided by the current. so, 1200/12.8= 93.75. But according to the maximum allowed by the fuses would be 120. some one please correct me if i am wrong.
Posted By: mobiletoys2002
Date Posted: February 11, 2004 at 9:22 PM
yeah current draw is about 96 amps at 1200 watts rms!!!
Posted By: orionmeades
Date Posted: February 11, 2004 at 9:22 PM
im not sure what the rms is but i know the max is 1200 watts?? i was thinkin the same thing about the fuses 120 amps but wasnt sure
Posted By: mobiletoys2002
Date Posted: February 12, 2004 at 10:39 AM
well if it's 1200 watts max then the fuse size is smaller than that!! Find out the rms power and we can figure out the current draw.I would say try a 60 amp or 80 at the battery if it dont blow at high volumes then leave it. it definately dont need a 120 amp fuse if the 1200 watt is the max rating!!
Posted By: speedwayaudio1
Date Posted: February 12, 2004 at 2:52 PM
use a multi meter check the a/cvoltage output of your amp and take that voltage and times it times itself and divid by the ohm load of your speakers. that will give you the watts its putting out. see ohms law calculators on this web site. they will help you.
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Big Dave
Posted By: lspker
Date Posted: February 12, 2004 at 9:24 PM
When you ball park the power or draw of the amp, don't forget the amps effieceintcy. They can range from 50 to 80%. So when you take 1200/12.8 and get 93.6 your assumming 100%, with the old Orion, its probably closer to 50%, so it could peak near 180 amp draw at peak load. 120 amp of fuse will let this happen for very short periods, but under normal operation you would get close to this.
Posted By: orionmeades
Date Posted: February 12, 2004 at 10:21 PM
thank you for all the help...im tying to find out whattype of power im going to have to have to feed this monster...thinking about 2 accuvolts one on each amp i have a 150r and a 250r the 150r prob wont be seeing the whole 120 amps but i know the 250r will... but again thanks for all the help... orion
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