WHAT AMP ALTERNATOR TO GET

[M82a1snake]

i have one yellowtop under hood and two xs power D3100's hooked up to 6000 true watts rms at 1 ohm. which amperage alternator should i get? if i get one 300amp alt(with an outboard rectifier) would that be good enough?? i have a regular trailblazer 4.2L engine, any ideas? i dont think i can go dual alts cuz not enough space but not sure.

[Team_DC-Derrick]

honestly, what amp do you have? just curious

DC alts is what i recommend but others like iraggi...

[M82a1snake]

two crescendo audio 3KWP amps. and idk if dc makes alts the fit in trailblazers....

[Team_DC-Derrick]

you just gotta call or email them, it wont be posted on their website. If they can make 2 300s for my integra im sure they can do something for you

[G_skillz81]

I'm happy with my Mechman 300A, but I'm quite sure you can't go wrong with DC or Iraggi either

[M82a1snake]

oh ok cool. so you think one 300amp alt would fit the job?? or will i need more?

[tomypg]

Calculate it out. 6000 watts/14.4 = 417 amps. One 300 amp alternator, depending on brand, will easily put out 75 percent of it's capacity a idle( I hope ), so 300 x .75 = that's 225 amps. So your getting round about half your power from the alternator. That's assuming you want no voltage drop, bu the two xs batts should keep that, personally I would get two for 6kw, but you can get away with one. Irragi and dc power should have dual alt kits for your car, if not they can custom make them.

Edited June 12, 2010 by tomypg

[dugee81]

Calculate it out. 6000 watts/14.4 = 417 amps. One 300 amp alternator, depending on brand, will easily put out 75 percent of it's capacity a idle( I hope ), so 300 x .75 = that's 225 amps. So your getting round about half your power from the alternator. That's assuming you want no voltage drop, bu the two xs batts should keep that, personally I would get two for 6kw, but you can get away with one. Irragi and dc power should have dual alt kits for your car, if not they can custom make them.

i think youll want to add efficiency in there! lets say, 6000 / .8 (efficiency) = 7500 watts. 7500 / 14.4 = 520 amps.

saying the amp is 8O% efficient, youll need to support a 520 amp load. someone correct me if im wrong.

Edited June 13, 2010 by dugee81

[Toady]

Mechman FTW

[M82a1snake]

ok sorry i dont have the ohms law pie chart memorized. but i thought itd look like this, 6000 X .81 (efficiency) = 4860 watts. 4860 / 14.4 = 337 amps.

which the amp IS 81% efficient at 1 ohm.correct?? or no? .... anyway so saying we go with these calculations "6000 / .8 (efficiency) = 7500 watts. 7500 / 14.4 = 520 amps. saying the amp is 8O% efficient, youll need to support a 520 amp load" ... i still dont know how size alternator i need do i just take half of that 520amps, so i'd need one 260 amps? therefore id get either a 250amp alt or a 300amp alt. and by the way mechman HO alts only have a single 250amp alt for my vehicle... unless 250amps would be ok and still operable and wouldnt see TOO much voltage dropage...