Power Formula

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Edicius

Copper - Posts: 90

Joined: March 11, 2003

Location: Georgia, United States

Posted: March 18, 2004 at 1:08 PM / IP Logged

Can some one give me the formula to calculate how many amps I will need out of my alternator depending on my amplifier setup. I had it a while ago but now I've lost it.

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jugga-nemo

Copper - Posts: 81

Joined: February 19, 2004

Location: United States

Posted: March 18, 2004 at 1:11 PM / IP Logged

watts RMS divided by the volts at idle.

5.25" Components & 5x7 Coax Kappas w/Power Acoustik OV4-800

KAC 7252 powering 2 D3 8" Diamonds

KDC-MP728, KGC-4042A

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00neon

Copper - Posts: 61

Joined: February 20, 2004

Location: United States

Posted: March 18, 2004 at 9:54 PM / IP Logged

so can i ask the dumb question (after all im a newbie, the thing says so) how do you figure out the volts at idle?

1 JL 12 w3 D4

1 MTX 421 D Monoblock

1 Sony Xplod 75x4

Front: Alpine SPX-177A

Rear: JL audio VR690-CXI

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Clean Install

Silver - Posts: 446

Joined: January 03, 2004

Location: United States

Posted: March 19, 2004 at 4:26 AM / IP Logged

Digital multimeter

If we learn from each success and

each failure, then we can improve ourselves

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00neon

Copper - Posts: 61

Joined: February 20, 2004

Location: United States

Posted: March 19, 2004 at 9:50 AM / IP Logged

CLEAN INSTALL wrote:

Digital multimeter

but what do you hook it up too?

1 JL 12 w3 D4

1 MTX 421 D Monoblock

1 Sony Xplod 75x4

Front: Alpine SPX-177A

Rear: JL audio VR690-CXI

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customsuburb

Gold - Posts: 1,813

Joined: January 17, 2004

Location: United States

Posted: March 19, 2004 at 10:42 PM / IP Logged

The average output of your alternator is 13.8 (this is without all of the acessories running though usually).

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celta

Member - Posts: 2

Joined: March 19, 2004

Location: Portugal

Posted: March 20, 2004 at 1:17 PM / IP Logged

W RMS/ 13.8

Ex: 400W RMS/13.8 = 28.98 Amp

Fuse = 30 Amp

celtic

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celta

Member - Posts: 2

Joined: March 19, 2004

Location: Portugal

Posted: March 20, 2004 at 1:20 PM / IP Logged

try JBL GTO 17" on rear and 15" on front. Well, it´s a Sony, don´t expect miracles.I have one to.

celtic

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Clean Install

Silver - Posts: 446

Joined: January 03, 2004

Location: United States

Posted: March 22, 2004 at 9:38 PM / IP Logged

00neon here you go: Power Formula -- posted image.

If we learn from each success and

each failure, then we can improve ourselves

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Power Formula

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