150amp Alternator for 2 PG Amps?

I have posted a couple of topics about which HO alternator to buy? and what cap to get? and should i get another battery?

Well as i read more and more post i see that most people are not even upgrading there altenator's to even 150amps which is what my truck brings from the factory.

let me explain what i have again:

150 amp Delphi Alternator (2002 Chevy Trailblazer)

1 Phoenix Gold Xenon 1200.1

1 Phoenix Gold Xenon 100.4

3 TV's and a Pionner Deck (draw few amps)

When I do the Ohm's Law calculator here on www.the12volt.com @ 1707 watts @ 14 volts = 121.92857 amps (Birth Sheets PG 1200.1 = 1210 watts, PG 100.4 = 497 watts )  I have a cap in the back of my truck with a digital volt meter  and i read between 13.5 and 14.1 volts consistenly so the highest amount of amps i would pull would be 126.44444 and this would be a FULL power which rarely you would have both amps at their max capacity. So i ask 1) How many amp are being pulled by other odds and end things in the car; ie lights, ac, whatever else? 2) Will i notice a real world difference ? thanks again for your comments a suggestions.........

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Eclipse 5435
US Amps Merlin MD2 x 2
US Amps Merlin MD42
Kicker Solo X 18"
MB Quart QSD216 x 2

I'd say the car alone pulls 50-60% of max rated output of the stock alternator. It's kinda overkill for a car to come from the favtory witha 150 amp alternator when the car only needs 40 to idle with lights, AC, ect.

Paul

Well, that truck does come with a 150a Alt. Just looked it up. The truck at max draw, with all accessories running will pull roughly 50 to 65 amps so, I am not sure as to why they put such a big ALT in them.

  Chris

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Alpine CDA-9833 HU
Diamond Audio M661 Components
MTX Thunder T6.6 Components:rear fill:
Cadence Q400 4 Channel Mains + rears
Thunder 801D Subs
MTX 1004 10's
Dual 4g wire to rear
4g grounds

Well damn, that's weird. I wonder if that alt will fit on my 96 Blazer. I know mines a v-6 and the trail blazer is an i-6, but I still wonder. Hmmmmm.

Paul

Sorry, diiferent part # and different harness. Not to say that with a little fabrication and electrical work, that it wouldn't though. But, also, for what one costs at the part store, u might as well by a beefed up alt anyway. Napa carries that alt for $204.

  Chris

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Alpine CDA-9833 HU
Diamond Audio M661 Components
MTX Thunder T6.6 Components:rear fill:
Cadence Q400 4 Channel Mains + rears
Thunder 801D Subs
MTX 1004 10's
Dual 4g wire to rear
4g grounds

Every one acts suprised that the factory acuallt put a 150 amp Alt on a truck.......

so what i gather is that 50-60 amps is what the truck uses so i have 90-100 amps free ? correct?

100 amps should be more than enought for the system correct?

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Eclipse 5435
US Amps Merlin MD2 x 2
US Amps Merlin MD42
Kicker Solo X 18"
MB Quart QSD216 x 2

amb4life:

This is kinda one of those things you just have to hook-up and find out. My inclination is to tell you that if you are *not* particularly aggressive user, you will *probably* find your stock power system adequate.

You are forgetting some pretty big pieces here tho..
1)Amplifier Efficiency - your amps do not just pull their rated power from the birth certificate... thats what they putout... according to PG's website, your amps waste something on the order of 20% of the power they get (which is actually really good)... you need increase your 125amp estimate to a round 150.
2)Your alt puts out different amounts of power depending on engine speed... how fast the pully is spinning the alt... So your PEAK output, prolly around 3000-rpm's or so (wild guess here, but inline with what I've seen from other alternators), is 150-amps. You are *not* going to be making that a stoplight... when your at idle and your alt is making say... 80-amps and you're watching TV and blaring a 1200-watt amp off an otherwise stock power system? Needless to say your battery will die a quick death.

Your "real world difference":
1)Dead batteries -> which quickly become bad batteries
2)Sub-amp cutting out on deep bass-notes.
3)Vicious dash/headlight dimming

I would tell you that if you have all that stuff in your car now and are not having any problems, be done with it. If you are getting ready to install that stuff, don't get anything right away, but prepared for a deep-cycle in the trunk or even a pair of deep-cycles in parallel..(my favorite configuration). I think your alternator would be fine to handle that load.. perhaps with a bit more than stock reserve capacity behind it.



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"I'm finished!" - Daniel Plainview

That more of the answer i was looking for...... thanks

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Eclipse 5435
US Amps Merlin MD2 x 2
US Amps Merlin MD42
Kicker Solo X 18"
MB Quart QSD216 x 2

Cheers. =)

So have you already installed it or is this juicy equipment sitting in your garage?

Keep us posted on your power situation, I've had so many power problems I'm always interested to see how other ppl do.

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"I'm finished!" - Daniel Plainview

sedate-i acually  have everything out of the truck (working on a new box and amp rack). sould have back in by next weekend.and i willkeep you posted.... Thanks for all

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Eclipse 5435
US Amps Merlin MD2 x 2
US Amps Merlin MD42
Kicker Solo X 18"
MB Quart QSD216 x 2

sedate - Got my update for you.....

Well this past weekened got around to installing everything.

Recap:

4 x Alpine SWR-1241D's ran from a Phoenix Gold Xenon 1200.1 ( In Series 2 Ohm Load)

2 x Alpine SRW-17LS Conponents ran from Phoenix Gold Xenon 100.4

Pionner AVH-P7500DVD & AVIC-80DVD

1 x JVC 9"Monitor 2 x JVC 6.5" Monitors

5 Farad Cap w/ 0 Guage wire from the battery to the back. As we said before I have a 150 amp alternator.

And the result is acuallly very good. No light dimming even with heavy hitting bass levels. i am maintaing 13.5 - 14.2 volts at the rear through the bass hitting. It hits hard as hell and i am very impressed. With the bass boost at about 50%-70% i get no light dimming however if i raise it up beyond that i do experence a minute amount of dimming at idle. (none at 2000 rpm's and above) I think alot of my power issues were with my previous amp (Phoenix Gold Octane R 8.0.1) it is not nearly as efficient as the Xenon. I am only running a 2 Ohm load which i belive is not drawing as much as the previous .66ohm load with Octane-R. I guess 150amp alternator was enought. Anyways these are my comments about the previous conversation we had. Hope this helps us all .....

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Eclipse 5435
US Amps Merlin MD2 x 2
US Amps Merlin MD42
Kicker Solo X 18"
MB Quart QSD216 x 2

amb4life:

Righteous man!

I'm really pleased you were able to get all that going without any excess hassle.

Soooo eh... how's 4 12's sound anyway? Heard 4 10's once... not a pretty story to say the *least*

What about the highs off those Xenon amps? How goes your 'end-user' impressions?
Tell us one thing you do *not* like..


Anywho, glad ur install worked out for ya...

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"I'm finished!" - Daniel Plainview

4 12's hmmmm.....Well It the first time that i have had 4 of anything and it is by far louder and is the hardest hitting system i have ever owned. You can hear me from a ways away. As far as daily drivers (not competition cars) its one of the best systems i have heard. YES I AM HAPPY WITH IT.

The Xenon amps happy with. i have been a PG fan for ever. the construction of the amps seem to be very well designed and engineered. its pretty much has all the bells and whistles. i like the fact that it handles all load tolerances automatically from 1ohm - 4 ohm at full power much like the JL amps do. i like that alll the inputs , power , and grounds are all on one side of the amps it makes for a clean install.

What i dont like ...well there is not much so fay that i dont  like; what i might alter a little for my liking would probally be the knobs for tuning. they are fuctional but a little bit of a pain to tune to a specific frequency. meaning that if you want your crossover to 55hz you must turn the knob 24 clicks. the clicks are little close together and your have to count 1,2,3,4,5,6,7 and so on. If your forget a number back to the begining you go. The size is a little big the 1200.1 is around 23 inches long x around 11 inches. (i know that big sound requires big gamps) but it would be nice if tey were a little smaller.  

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Eclipse 5435
US Amps Merlin MD2 x 2
US Amps Merlin MD42
Kicker Solo X 18"
MB Quart QSD216 x 2

errrrrrrrr..............i blew a sub today..............DAMMIT........ohh well what can you do about it.......thank god for warrenty........the rubber surround seperated from the center..........

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Eclipse 5435
US Amps Merlin MD2 x 2
US Amps Merlin MD42
Kicker Solo X 18"
MB Quart QSD216 x 2