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Old 03-14-2008, 10:19 AM   #1
Yacdogg
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alternator ?

How many amps is the 99 GA GT alternator ?
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Old 03-14-2008, 11:41 AM   #2
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105
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Old 03-14-2008, 12:51 PM   #3
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How many watts is the amp you want to use?
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Old 03-14-2008, 01:47 PM   #4
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RMS. max ratings are useless.......
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Old 03-15-2008, 02:55 PM   #5
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Quote:
Originally Posted by Yacdogg View Post
How many amps is the 99 GA GT alternator ?
105.
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Old 03-15-2008, 07:26 PM   #6
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(looks like someone is looking at electrical upgrades...)
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Old 03-15-2008, 07:33 PM   #7
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(I think I hear an echo in here...)

105 AmpHour at the maximum rate.
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Old 03-15-2008, 11:55 PM   #8
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thought this would help..

"The formula for finding wattage is very simple.

Watts = Volts x Amps


So lets say you have a 1000 watt stero system in your car. You wanna know how many amps that its sucking down.

Amps = Watts / Volts

Since a car battery is 12 volts: 1000W / 12V = 83.3 Amps."
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Old 03-16-2008, 01:24 AM   #9
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dont u have to factor in effiency as well?
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Old 03-16-2008, 09:59 PM   #10
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Quote:
dont u have to factor in effiency as well?
For what?

That is the formula for what he is looking for.
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Old 03-16-2008, 10:09 PM   #11
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oh nvm, you have to use an efficiency percentage when calculating the amps output (watts)
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Old 04-07-2008, 09:49 AM   #12
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props, was very helpful. question though, I am currently running a kenwood sub amp that kicks out 1000w (Max) and 300w RMS. When using the forumla would I divide the watts RMS by the total volts or the max out.

so...

1000W / 12V or 300W / 12V?

im assuming its max. Just a though though...
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Old 04-09-2008, 08:01 PM   #13
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Quote:
Originally Posted by blb250 View Post
props, was very helpful. question though, I am currently running a kenwood sub amp that kicks out 1000w (Max) and 300w RMS. When using the forumla would I divide the watts RMS by the total volts or the max out.

so...

1000W / 12V or 300W / 12V?

im assuming its max. Just a though though...
go for the rms.....
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Tanabe Touring 3in catback, ERZ bellmouth catted downpipe, catless uppipe, SPT Pink springs, SPT short shifter, SPT intake, stereo, Cobb Accessport stage II, Prosport boost/oil temp/volt gauges, 35%, 17x8 Rota Torques, F/R strut braces

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Old 04-09-2008, 09:48 PM   #14
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^^Ditto, you will have to account for efficency of the amplifier in there

Say we take a 1200rms amp

Most vehicle electrical systems are 12.5VDC at idle, and between 13.8 and 14.4VDC above about 900rpm but we use 12 volts as the standard for these calculations because most amplifiers today use a regulated power supply, so they get 12VDC regardless of input voltage, so...
1,200 watts divided by 12 volts equals 100 Amperes of current.
If this is a class D amplifier, it'll be ~80% efficiend, so we'll add 20% of 100A to the total, and we get about 120A of current demand continuously at peak output.
This means that the electrical system of the vehicle will need to produce an extra 120 Amperes of electrical current to power your amplifier and subwoofer at peak levels. Keep in mind that the factory electrical system is designed to produce enough charging power (alternator and battery) for the vehicle's stock equipment, and was not designed to accomodate high-powered audio systems.
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Old 04-13-2008, 10:58 PM   #15
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Random question, but anyone know approx how much of the current is used by the stock equipment under normal running conditions? No lights on, No rear defrost, no wipers, etc...

Like, if it produces 105amps, how much is leftover for our amplifiers after the cars electrical system gets at it?
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Old 04-13-2008, 11:12 PM   #16
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id imagine not too much.....
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