how powerful of a alt ? - Realm of Excursion



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Old 11-05-2006   #1 (permalink)
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Default how powerful of a alt ?

i was wondering if there is a chart of how powerful of a alt is needed for like 5k watts ?

example

5000 watts = 150a... i currently have a 80a and pushing 2000w... lights are dimming badly and sometimes shut off... i don't wanna get a 300a alt if i don't need too...
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Old 11-05-2006   #2 (permalink)
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Default Re: how powerful of a alt ?

Not sure the answer to your question, but if you ahven't done the big 3, it'll help with your lights.
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Old 11-05-2006   #3 (permalink)
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Default Re: how powerful of a alt ?

Quote:
Originally Posted by roxbury
Not sure the answer to your question, but if you ahven't done the big 3, it'll help with your lights.
how much Wire do you think it would require ?? i only have about 5f 2g...
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Old 11-05-2006   #4 (permalink)
 
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Default Re: how powerful of a alt ?

really you should allow yourself some headroom, to be safe you should add whatever excessive draw to the size you have now. I.E. your factory is 80amp and you total average draw is 150 you should get something in the 230-250amp range. If you go smaller and continue to run your system hard, you increase the chance of damaging your altenator. There is no way your current alt is supporting your current system. 80amps x 13.5V= 1080watts your battery is taking a beating
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Old 11-05-2006   #5 (permalink)
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Default Re: how powerful of a alt ?

Quote:
Originally Posted by Prometheus
really you should allow yourself some headroom, to be safe you should add whatever excessive draw to the size you have now. I.E. your factory is 80amp and you total average draw is 150 you should get something in the 230-250amp range. If you go smaller and continue to run your system hard, you increase the chance of damaging your altenator. There is no way your current alt is supporting your current system. 80amps x 13.5V= 1080watts your battery is taking a beating
is that the formula ?? so a 300a alt 300x 13.5v= 4050w rms max ?
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Old 11-05-2006   #6 (permalink)
 
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Default Re: how powerful of a alt ?

Ohm's law dictates: IxE=P or Current x Voltage = Watts. Now this formula only gives total available Power or total draw. To determine amplifier output you have to adjust for effeciency ie a typical class D amp is >75% efficient. So using your example 4050w draw = 3037.5w of output. 25% is lost in the conversion and transformed into heat.
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Old 11-05-2006   #7 (permalink)
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Default Re: how powerful of a alt ?

Quote:
Originally Posted by Prometheus
Ohm's law dictates: IxE=P or Current x Voltage = Watts. Now this formula only gives total available Power or total draw. To determine amplifier output you have to adjust for effeciency ie a typical class D amp is >75% efficient. So using your example 4050w draw = 3037.5w of output. 25% is lost in the conversion and transformed into heat.
i'm think about getting a solox 18... 5000w rms... should i get a 300a or 2 or 3 or what ?
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Old 11-05-2006   #8 (permalink)
 
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Default Re: how powerful of a alt ?

It all depends on your listening habits, if you plan on running it wide open (full draw+) it would be a good idea to have a large alt (300A+), if you plan on only doing short demos (ie burps) you can stiffin the voltage with batteries and capacitors, keep in mind 1 farad will suport a 1kw draw for 1 sec, so you would need 50 farads plus to really support a long burp, that is if you don't augment your system with batteries.
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Old 11-05-2006   #9 (permalink)
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Default Re: how powerful of a alt ?

well my habits are about 1/3 volume on the hu and normally about +5 on the bass knob out of +18 and will do max volume for about 1 min at a time to make people mad and stuff...

eedit : i never play my music while my car is off and will have 2 yellow tops both under the hood...
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Old 11-05-2006   #10 (permalink)
 
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Default Re: how powerful of a alt ?

The question was more about total draw, it too hard to determine the amount of total draw by how deep you are into the volume, since there are too many factors; preamp voltage, gain settings, total system impedance, yatta yatta yatta. I've built systems that size around a 250A alt before, but it had a 50farad cap and Stinger SP1700 (which is equivilent to two of your optimas) as a second battery and no problems or dimming.
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Old 11-05-2006   #11 (permalink)
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Default Re: how powerful of a alt ?

Quote:
Originally Posted by Prometheus
The question was more about total draw, it too hard to determine the amount of total draw by how deep you are into the volume, since there are too many factors; preamp voltage, gain settings, total system impedance, yatta yatta yatta. I've built systems that size around a 250A alt before, but it had a 50farad cap and Stinger SP1700 (which is equivilent to two of your optimas) as a second battery and no problems or dimming.
i really doubt i'm gonna get a cap since it strains the alt... since the 300a is $600... idk... i don't wanna hurt it at all
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Old 11-05-2006   #12 (permalink)
 
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Default Re: how powerful of a alt ?

Caps only presents a strain when the alt is too small, since it becomes another burden on the alt (requires a charge), when used correctly they will tighten up the bass and keep your amps and alt happy. The problem is that misinformed installers (the BB and CC type) sell them as a voltage/current cure-all. Dimming headlights? Here is a cap cha-ching...
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Old 11-05-2006   #13 (permalink)
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Default Re: how powerful of a alt ?

Quote:
Originally Posted by Prometheus
Caps only presents a strain when the alt is too small, since it becomes another burden on the alt (requires a charge), when used correctly they will tighten up the bass and keep your amps and alt happy. The problem is that misinformed installers (the BB and CC type) sell them as a voltage/current cure-all. Dimming headlights? Here is a cap cha-ching...
so running 5k watt what would you suggest ? 5 1 farad caps ?
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Old 11-05-2006   #14 (permalink)
 
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Default Re: how powerful of a alt ?

5 farads would only be good for 1sec before the caps are drained and the load goes to the batts and alt, not a very good demo. 50 farads gets you 10secs of pure unadulterated bass bliss before your alt and batts feel the draw. It's longer than it sounds. Rather than 50 1 farad caps, look at one of the hybrids that offer anywhere from 25-100 farads of capacitance, or even a single batcap, some are rated as the equivilent of 800farad(that is why these are so popular).
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Old 11-05-2006   #15 (permalink)
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Default Re: how powerful of a alt ?

Quote:
Originally Posted by Prometheus
5 farads would only be good for 1sec before the caps are drained and the load goes to the batts, not a very good demo. 50 farads gets you 10secs of pure unadulterated bass bliss before your alt and batts feel the draw. It longer than it sounds. Rather than 50 1 farad caps look at one of the hybrids that offer anywhere from 25-100 farads of capacitance or even a single batcap, some are rated as the equivilent of 800farad(that is why these are so popular).
links ????

something like this ?

http://www.caraudiodeals.com/product...products_id=84
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Old 11-05-2006   #16 (permalink)
 
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Default Re: how powerful of a alt ?

www.stingerelectronics.com/web/prods/capacitors.asp
www.alumapro.com/ Look under products, and the C.A.P these are pricey though...
www.batcap.net these are pretty cool...

You can probable find these at a resonable price online, it seems as though every member is an Ebay addict here...good luck.
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Old 11-06-2006   #17 (permalink)
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Default Re: how powerful of a alt ?

Quote:
Originally Posted by Coolwazabi
i was wondering if there is a chart of how powerful of a alt is needed for like 5k watts ?

example

5000 watts = 150a... i currently have a 80a and pushing 2000w... lights are dimming badly and sometimes shut off... i don't wanna get a 300a alt if i don't need too...


Here is a good formula to use :

1.) Determine fuse value of the amplifier.

2.) Divide the RMS power Rating by the Peak power rating.

Example:

50Watts RMS Divided by 100 Watts Peak Power = .50 (50%)

Once you figure the percentage of RMS vs. Peak power, you multiply the fuse value of the amplifier by the RMS percentage.

Example:

If the amplifiers fuse value was 30A, then 30A multiplied by 50% would be 15A of continuous current draw.
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Old 11-06-2006   #18 (permalink)
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Default Re: how powerful of a alt ?

too much > not enough. spend tha extra dough & do 300. IMO.
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Old 11-06-2006   #19 (permalink)
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Default Re: how powerful of a alt ?

Quote:
Originally Posted by Excessive Amperage
Here is a good formula to use :

1.) Determine fuse value of the amplifier.

2.) Divide the RMS power Rating by the Peak power rating.

Example:

50Watts RMS Divided by 100 Watts Peak Power = .50 (50%)

Once you figure the percentage of RMS vs. Peak power, you multiply the fuse value of the amplifier by the RMS percentage.

Example:

If the amplifiers fuse value was 30A, then 30A multiplied by 50% would be 15A of continuous current draw.
well the max is 4000 and rms is 2000 so i'd say .5 then the fuse is 250 so a 175 alt is recommended ?
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Old 11-06-2006   #20 (permalink)
 
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Default Re: how powerful of a alt ?

Quote:
Originally Posted by Excessive Amperage
Here is a good formula to use :

1.) Determine fuse value of the amplifier.

2.) Divide the RMS power Rating by the Peak power rating.

Example:

50Watts RMS Divided by 100 Watts Peak Power = .50 (50%)

Once you figure the percentage of RMS vs. Peak power, you multiply the fuse value of the amplifier by the RMS percentage.

Example:

If the amplifiers fuse value was 30A, then 30A multiplied by 50% would be 15A of continuous current draw.
This is fine for moderate daily use, but during burping and testing amplifiers can draw up to double the fuse rating. A typical fast blow fuse can withstand double the rated draw for 5 seconds before blowing, altenators don't have this margin built in you hit a 175A alt with 400A+ worth of draw and game over...
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Old 11-06-2006   #21 (permalink)
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Default Re: how powerful of a alt ?

Get a 300 amp, two batts in the back and have fun.
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Old 11-06-2006   #22 (permalink)
 
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Default Re: how powerful of a alt ?

Quote:
Originally Posted by Anotherguy
Get a 300 amp, two batts in the back and have fun.

Thank you
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