1. ## are the fuse ratings on an amp how many amps it draws?

like my amp has 150amp fuse, the other one has 50 amp fuse. so are they drawing 200 amps. do i need a 200 amp alt.

bump...

lol, no.

4. ## Re: are the fuse ratings on an amp how many amps it draws?

how can you find out how many amps they draw

5. ## Re: are the fuse ratings on an amp how many amps it draws?

By using an amprobe. Clamp it on and it will tell you how many amps you are pulling. Or you could do Watts x Volts = Amps, but it will be a little higher than that based on how efficient your amp is.

6. ## Re: are the fuse ratings on an amp how many amps it draws?

A good start is by determining current draw based on power output and efficiency.

7. ## Re: are the fuse ratings on an amp how many amps it draws?

Originally Posted by squeak9798
A good start is by determining current draw based on power output and efficiency.
what he said

P = I*v

9. ## Re: are the fuse ratings on an amp how many amps it draws?

aren't all fuse rateings totaled = max draw ?

thought thats how it was explained to me.

10. ## Re: are the fuse ratings on an amp how many amps it draws?

Originally Posted by wagon5.1
aren't all fuse rateings totaled = max draw ?

thought thats how it was explained to me.
i do believe it is max amp, so ur system will probably never reach that. But it can be deceiving as some manufacturers use internal fuses. I believe the Md3d from US Amps has this

11. ## Re: are the fuse ratings on an amp how many amps it draws?

Originally Posted by wagon5.1
aren't all fuse rateings totaled = max draw ?

thought thats how it was explained to me.
Someone explained it to you incorrectly.

12. ## Re: are the fuse ratings on an amp how many amps it draws?

Originally Posted by squeak9798
A good start is by determining current draw based on power output and efficiency.
+1

Find out your amp's efficiency, then divide the amp's RMS output by the efficiency (eg if its 75% efficient, divide by 0.75 .) Next divide by your car's voltage. This will give you the amperage draw.

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