hey everyone i have a problem with keeping my battery charged. i have about a 2000watt system. the 2000 watts inchlude the deck, two tens, two 6x9s and two tweeters, i have a 560 watt amp pushing the two tens. i have the tweeters and the 6x9s hooked to the deck. My altenator was bad so i replaced it with a 100 amp one. i have drained my battery a number of time went through two batterys. i have an idea on why it might be doing this. i have a 12 volt battery and a 100 amp altenator, with watts law doesnt that only throw me out 1200 watts? know this post is a little long but i did the best i could. any help would be greatly appreciated. hehe dont want to get rid of the system but i want to keep the car too. thank u all very much

 

well krap i thought it was watts law now i am thinking that it might be ohm's law well u guys know what im thinking of dont u? i want to know what the reason is for my pronlem

 

You might want to try a deep cycle battery from Optima.

optimabatteries.com

Also, I don't see how you are coming up with the 2000 watts of total power. So what you are saying is that your head unit is putting out 1440 watts total power (considering you stated that the sub amp is putting out 560watts)? I don't think so!

You are completely misunderstanding the meaning of a speaker's power rating. When a speaker is rated at 100W for example, it means that it can handle up to 100W. It does NOT mean that it puts out 100W of power.

Therefore, the total "power" of your system is the sum of the output from your headunit and your sub amp only. I hope you haven't been telling everyone you have a "2000watt" system.

Also, your 12 volt system with a 100amp alternator is not putting out 1200W of power. You might want to look here for an explanation of voltage, watts, amperage, etc...
http://www.bcae1.com/

 

so what u are telling me is the 200watt head unit and the 560 watt amp and the two 800 watt tens and the 320 watt 6x9s doesnt matter? i think i am going to throw up a yard sell and stick to whellin

 

There might be something else wrong with your truck's electrical system. Your stereo system is not drawing anywhere near enough power to overstress the current that your (new) 100A alternator is delivering. You are not playing your stereo loudly with the engine off for a long period of time are you? Also, I assume you have the remote wire hooked up between the head unit and the sub amp. If not, the amp will be on 27/7. Doing either or both these things will eventually drain and kill your battery.

Not to burst your bubble, but it is important to emphasize that your head unit is in reality NOT putting out 200W (50Wx4), even though that is what it may say on the faceplate.

Quote from www.caraudiohelp.com...
"The number printed on the face of the receiver is usually a large exaggeration. Most receivers actually have between three and fifteen watts RMS per channel."
The 200W rating is the PEAK power that the head unit can deliver over only a very brief period of time. The RMS power is the power the head unit can deliver on average, over a long period of time. The RMS power rating is always much lower than the peak power rating. This will probably also apply to your "560 watt" sub amp, which is likely the peak power rating.
If for any reason you doubt what I am saying, read this webpage...
http://www.bcae1.com/voltages.htm

And again, the total "power" of your system is the sum of the output from your head unit ampsand your sub amp only. The speakers power ratings tell you how much power they can HANDLE, not how much power they are putting out. Only the amps are capable of delivering power. The speakers convert that power to sound, so to speak. You also might want to read this to get a better understanding about the power rating of speakers...
http://www.bcae1.com/speakrat.htm

 

I would like to retract this statement. A 100A alternator in a 12V system would be making 1200W if Ohm's law can be applied as follows... P=I*V
I went and did a "refresher course" by reading this site...
http://www.bcae1.com/ohmslaw.htm

Nonetheless, my other comments still hold very true. Hardcore4x4er's stereo system is not putting out anywhere near the power which would "overload" his truck's charging system. You also have to consider that an amp is not going to be putting out it's max rated power all the time, unless you had the system volume turned up all the way in your system.

Also, the problem would not be with the remote wire not being hooked up. If this was the case, the amp would not even turn on.