how much electrical will I exactly need

[playyamxz550 10+ year member]

will a 250 h/o alt 0 gauge going from the alt to the battrie and 6 big deka's in the back be enough for 7000rms? will it hold 14v?

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[Bettr n' Revrse 5,000+ posts]

Good lord Id hope so...

 

[playyamxz550 10+ year member]

why u think I wont need that many battries 4 then?

 

[Bettr n' Revrse 5,000+ posts]

I was gunna run one big deka for like 2400 watts or so, so ya id say 4 plus a good front batt would be good

 

[retrojordans 10+ year member]

You obviously have a lot to learn about batteries and your car's charging system.

You know there is actual math and science involved in this audio stuff lol not just guessing.

7000 watts x 2 to cover for efficiency = 14k

14k divided by average Alternator voltage output of 14v = 1000

Since you won't be running test tones or burps you can divide that current draw of 1000 by 3 because on music, and not on max volume all the time, you won't be pulling 7k.

Which = 333 amps.

If you don't run at least 333 amps from your alt(s) you will begin to pull energy from your battery which is not good for your battery, alternator, amps, subs and more importantly your wallet..

You need a 400 amp alt, a starter battery under the hood...E.g. Die Hard...Autozone nothing crazy..A battery isolator...and a Series 31 battery for your system.

That is it...

If you will be burping with the car turned off like at a competition...Then you need sufficient battery capacity for the burps.

 

[playyamxz550 10+ year member]

You obviously have a lot to learn about batteries and your car's charging system.
You know there is actual math and science involved in this audio stuff lol not just guessing.

7000 watts x 2 to cover for efficiency = 14k

14k divided by average Alternator voltage output of 14v = 1000

Since you won't be running test tones or burps you can divide that current draw of 1000 by 3 because on music, and not on max volume all the time, you won't be pulling 7k.

Which = 333 amps.

If you don't run at least 333 amps from your alt(s) you will begin to pull energy from your battery which is not good for your battery, alternator, amps, subs and more importantly your wallet..

You need a 400 amp alt, a starter battery under the hood...E.g. Die Hard...Autozone nothing crazy..A battery isolator...and a Series 31 battery for your system.

That is it...

If you will be burping with the car turned off like at a competition...Then you need sufficient battery capacity for the burps.

okay thanks for clearing that up for me, then why do some many people run alot of battries my freind has 3 for his 2 18's and he has a iraggi 300 but I hear iraggi's are paperweights....and wear would I find a good quaility 400 amp altnator

 

[retrojordans 10+ year member]

Well even a "300" amp Iraggi may only only put out half of that while at idle, add screens, aftermarket dvd head units, HID head lights, etc...You may still be running thin on ampere output thus requiring batteries to draw from...The other explanation is that 90% of people are just flat out misinformed..

Say your car's electronics use 200 amps. You run an Iraggi "300amp" alt that put out 180a @ idle..Sitting in the parking lot idling you are already drawing from your batteries....This is why people run 2, 3, 4, sometimes even 5 or more alternators because batteries should be a last resort. An alternator puts out a steady minimum and maximum power output due to a voltage regulator, a battery's voltage can drop drastically when put under strain ultimately leading to voltage drop, the #1 cause of blown stereo components, and blown, useless batteries for that matter..

It's the alternator's job to run this ****...Remember lol in a stock car all the battery does is start the car....Headlights, wipers, radio, fuel pump, guages, AC, EVERYTHING electric gets it's power from the alternator..

The only reason to have 20 batteries is because at a certain point you either can't fit 5+ alts under the hood, or you don't have the actual horsepower to turn all those alts lol...It takes a lot of engine to rev 6x 350a alts...

Plus like I said most people with battery banks are competitors, and while competing in some classes your car must be turned off....No alternator running when the car is off obviously so your system is totally reliant on the battery bank.

 

[playyamxz550 10+ year member]

okay well I have a 05 escalade with the 6.0 motor the stock alt is 160amp with 90amp at idle and even I had 2 12's with a 300w rms rockford on it and stuff was diming already, would 2 dc 270 amp alt be a good choice for 3 audioque 18 alumium coils,3 2200d amps, and possiably another 1000w amp 4 channel for the door speakers im going to put in....how much is a setup with 2 alt's i no they are about 550$ each so thats 1200$ right there, and would you have any idea If these altnators will fit my new truck which is going to be an 08 tahoe with the 5.3 or are the altnators diffrent or the gm's stayed the same

 

[retrojordans 10+ year member]

okay well I have a 05 escalade with the 6.0 motor the stock alt is 160amp with 90amp at idle and even I had 2 12's with a 300w rms rockford on it and stuff was diming already, would 2 dc 270 amp alt be a good choice for 3 audioque 18 alumium coils,3 2200d amps, and possiably another 1000w amp 4 channel for the door speakers im going to put in....how much is a setup with 2 alt's i no they are about 550$ each so thats 1200$ right there, and would you have any idea If these altnators will fit my new truck which is going to be an 08 tahoe with the 5.3 or are the altnators diffrent or the gm's stayed the same

Well just to ballpark your ampere draw just take the fuse rating of the amp and divide it by 2...For example an amp that calls for a 250a ANL in line fuse will pull roughly 125 amps from the alt..Now that 175 amps is just for the amp...Not for everything else in the whole car, I'de need another stock level or higher alt to power the stock stuff in the car plus other added accessories.

My understanding is you can have a high-end HO core re-cased into a case with different mounting holes. On common trucks like Escalades and Tahoes odds are the company that is making, and re-casing the Alts also either commissions the fabrication of, or offers prefab'd multi alt brackets.

It's just the mounting holes unless custom brackets are offered, and then the pulley on the alt must fit the type of belt that is on whatever vehicle.

You are going to want as many alt's as you can fit in the truck which is probably 4. Believe me lol the amount of maintenance batteries need -- to make them perform to their full potential for more than a couple years -- and how much they cost, alternators are a much more sound investment.

 

[playyamxz550 10+ year member]

I hear you 100%, I think im going 2 do is for now get that 250amp alt and run the 2 18's on the 2 2200d amps, then when I get my new truck in 8 months I will do 4 iraggi 300 amp alt's. I see this setup on steve meade, ishultz 4 18in soundstreams xxx trucks...my question is why would steve run extra battries then his system is for like 100% being the bass daily system and thats what I wanna do, so pretty much I wont need spair battries if I have the altnator support.

 

[disturbed471985 5,000+ posts]

6 dekas and a tru 250amp alt can feed 7k. Assuming your just going to demo and use it as a DD then your good. Will it stay above 14v who knows every car is different and so is every setup so no one can tell you with 100% positivity what your volts will be.

Just remember 6 dekas are going to be around 600lbs just by themselves so I hope you have upgraded your shocks..

 

[retrojordans 10+ year member]

He runs 20,000 watts rms (under-rated) Plus a full blown touch screen computer in his car, screens, sound processors, eqs, etc..

But even his: 25k x 2 / 14v / 3 = 1190 / 4 alts = about 300 amps per alt @ 3k rpms. @ Idle those 4 alts are putting out around 160 each = 640 which is about half of what he needs while he's sitting idle demo'ing.

a Kinetik HC2000 can take a 300a load for 10 seconds and drop to 9v so to listen to a short demo ( 60 seconds ) you need 6 of those. So 12 HC2000s covers the 600a his alts can't cover for that 1 minute demo.

If he's driving on the freeway I guarantee his batteries are doing next to nothing.

 

[playyamxz550 10+ year member]

okay im looking now iraggi has 380 amp alts for 619$ would 2 of these be good my system the 3 18 with the 3 2200d's and the 1000w for the door speakers?

 

[retrojordans 10+ year member]

okay im looking now iraggi has 380 amp alts for 619$ would 2 of these be good my system the 3 18 with the 3 2200d's and the 1000w for the door speakers?

2200 x 3 + 1000 = 7600 x 2 = 16k / 14v = 1150 / 3 = 383a alt

The truck usues 75% of it's stock 145a alt which = 110a alt

..383 (system)

..110 (wipers,lights,etc)

.+ 50 (extra)

543 amp alts needed.

2 x 380 = 740 so you should be in real good shape. Always overcompensate so no single component is under too much strain.

You should probably run a decent battery to each amp as a rule of thumb just to smooth help smooth and compensate for any fluctuations or failures.

Alts - Isolator - Starter battery - Kinetik HC 800 - Kinetic HC 800 - Kinetik HC800

..................................................._AMP_.............._AMP_..............._AMP......

..................................................._SUB_.............._SUB_..............._SUB_......

 

[pro-rabbit 5,000+ posts]

What ***** is when your building a truck that will be just sitting in a booth not running //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

You don't want to know how many dekas will be in the back..trust me

6 dekas and a tru 250amp alt can feed 7k. Assuming your just going to demo and use it as a DD then your good. Will it stay above 14v who knows every car is different and so is every setup so no one can tell you with 100% positivity what your volts will be.
Just remember 6 dekas are going to be around 600lbs just by themselves so I hope you have upgraded your shocks..

They are only about 60lbs or so each.. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif