Amperage calculation


Gold Member
Username: Skdooley

Roanoke, VA Usa

Post Number: 1144
Registered: Oct-09
Can anyone tell me the amperage calculation. For instance if you're running a given RMS amp, how many amps it will be pulling off your car, etc. I've seen it mentioned on here from time to time but can't recall exactly how it works. Thanks

Gold Member
Username: Bonhamd

Traverse City, MI

Post Number: 2307
Registered: Nov-07
amps x volts = watts
use 12 volt as a standard

say you have a 200 amp alty

200 amps x 12 volts = 2400 watts

just a round about number

keep in mind this does not include your vehicles amperage needs

Gold Member
Username: Skdooley

Roanoke, VA Usa

Post Number: 1147
Registered: Oct-09
Awesome, thank you. That's exactly what I was looking for. The same could be said that watts/voltage = amps. So if you were planning on running a 1.5k system you would expect to need 120 free amps from your alt if you maintained atleast a 12.5 voltage.

Silver Member
Username: Cenus

Post Number: 135
Registered: Aug-08
keep in mind though your not gonna be drawing a full 120amps all the time. music is dynamic and you have imp rise to deal with. but it is better to be safe than sorry.

Gold Member
Username: Livin_loud

MW2 Addict

Post Number: 3202
Registered: Jan-06
keep in mind power factor and 3 phase calculations.

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