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Car Audio Help
Wiring, Electrical & Installation
Do I need a HO Alternator?
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<blockquote data-quote="GHOSTOWLGRID" data-source="post: 7970210" data-attributes="member: 647694"><p>^ THIS! This is helpful to the OP! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p><p></p><p>Like I said, your not limited to a GM alternator or a custom HO alternator. There are options! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p><p></p><p></p><p>Something along those lines. But the amps are better than that.</p><p></p><p>But then again, that is hard to measure, And that is at max output nonstop.</p><p></p><p>Read below my reply to what you replied.</p><p></p><p>[quote name='&gt;&gt;SQL</p><p></p><p>An amp that is 75% efficient converts 75% of the electricity going in into power going out.</p><p></p><p>So that amp would use 100 watts of power to make 75 watts of output.</p><p></p><p>That is why the OP needs 166 amps of power to produce 1' date='500 watts[/quote']</p><p></p><p>I just realized your math is wrong. lol</p><p></p><p>1500 watts divided by 12 volts is: about 125 amps.</p><p></p><p>1500 watts divided by 13.5 volts is: about 111 amps.</p><p></p><p>Cars run around 13 volts...</p><p></p><p>My Car with everything being used, I have:</p><p></p><p>1) Lights: 500 watts.</p><p></p><p>2) The power consumption of everything else on my car before mods: 850 watts.</p><p></p><p>3) The power consumption of my head unit and amp, lets round up for fun: 150 watts.</p><p></p><p>This gives me a grand total of about 1500 watts consumed.</p><p></p><p>Now lets pretend my car only runs at 12 volts, The current draw will be something like: 125 amps.</p><p></p><p>Now lets being the reality of what my car runs at all the time,, 13.5 volts average, now my current is: about 111 amps.</p><p></p><p>(This is why my 105 amp alternator was just not enough, all I needed was a little extra, but I picked the 140 amp supply because it was the next size up).</p><p></p><p>The OP's vehicle at stock consumes a max of 80 amps max at about 13-13.5 volts. Lets say 13 to make it easy.</p><p></p><p>Lets say his amp draws 100 watts. Well, you will draw about 8.3 amps at 12 volts, and about 7.6 amps at 13 volts.</p><p></p><p>The 105 amp alternator would be more than enough also considering that is max power consumed from the amp at max operating load.</p><p></p><p>Now, lets assume a combination of audio amps pulls a max of 30 amps: 80+30=110 amps draw total.</p><p></p><p>Lets assume a combination of audio amps pulls a max of 60 amps: 80+60=140 amps draw total.</p><p></p><p>But, the power pulled will never be at a constant max, it will always be variable and based upon the volume knob in the car.</p><p></p><p>Given this, the OP can be able to better select an alternator.</p><p></p><p>BUT, Given math like this, there is, its considered the ideal situation, the real world application will be more or leess given tolerances and watever.</p><p></p><p>So with that, I suggest the OP pick something to allow a little extra.</p><p></p><p>Because given audio systems, you will always want to upgrade and increase power later, I know I did. lol</p></blockquote><p></p>
[QUOTE="GHOSTOWLGRID, post: 7970210, member: 647694"] ^ THIS! This is helpful to the OP! [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] Like I said, your not limited to a GM alternator or a custom HO alternator. There are options! [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] Something along those lines. But the amps are better than that. But then again, that is hard to measure, And that is at max output nonstop. Read below my reply to what you replied. [quote name='>>SQL An amp that is 75% efficient converts 75% of the electricity going in into power going out. So that amp would use 100 watts of power to make 75 watts of output. That is why the OP needs 166 amps of power to produce 1' date='500 watts[/quote'] I just realized your math is wrong. lol 1500 watts divided by 12 volts is: about 125 amps. 1500 watts divided by 13.5 volts is: about 111 amps. Cars run around 13 volts... My Car with everything being used, I have: 1) Lights: 500 watts. 2) The power consumption of everything else on my car before mods: 850 watts. 3) The power consumption of my head unit and amp, lets round up for fun: 150 watts. This gives me a grand total of about 1500 watts consumed. Now lets pretend my car only runs at 12 volts, The current draw will be something like: 125 amps. Now lets being the reality of what my car runs at all the time,, 13.5 volts average, now my current is: about 111 amps. (This is why my 105 amp alternator was just not enough, all I needed was a little extra, but I picked the 140 amp supply because it was the next size up). The OP's vehicle at stock consumes a max of 80 amps max at about 13-13.5 volts. Lets say 13 to make it easy. Lets say his amp draws 100 watts. Well, you will draw about 8.3 amps at 12 volts, and about 7.6 amps at 13 volts. The 105 amp alternator would be more than enough also considering that is max power consumed from the amp at max operating load. Now, lets assume a combination of audio amps pulls a max of 30 amps: 80+30=110 amps draw total. Lets assume a combination of audio amps pulls a max of 60 amps: 80+60=140 amps draw total. But, the power pulled will never be at a constant max, it will always be variable and based upon the volume knob in the car. Given this, the OP can be able to better select an alternator. BUT, Given math like this, there is, its considered the ideal situation, the real world application will be more or leess given tolerances and watever. So with that, I suggest the OP pick something to allow a little extra. Because given audio systems, you will always want to upgrade and increase power later, I know I did. lol [/QUOTE]
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