Nickvb6 Posted April 29, 2008 Report Share Posted April 29, 2008 Ok i am going to be running 4 amp's total of 6000 watts rms and i got one 0g wire running from my batt to the back of my car where there will be another batt and was wanting to know should i have another 0g wire running back there? Quote Link to comment Share on other sites More sharing options...
pstone11 Posted April 29, 2008 Report Share Posted April 29, 2008 At least one more run of 0 and a total of two batteries in the back. Quote Check out StoneSounds to see my recent builds.Or look at the Flying White Facebook Page! Link to comment Share on other sites More sharing options...
Nickvb6 Posted April 29, 2008 Author Report Share Posted April 29, 2008 About 300amp fuses i got a 250amp on it right know? Quote Link to comment Share on other sites More sharing options...
pstone11 Posted April 29, 2008 Report Share Posted April 29, 2008 Oh yeah, and a nice HO alternator. Quote Check out StoneSounds to see my recent builds.Or look at the Flying White Facebook Page! Link to comment Share on other sites More sharing options...
Nickvb6 Posted April 29, 2008 Author Report Share Posted April 29, 2008 Ok i was doing some math witch i not good at but i figure that a 150amp alt and a good 12v up front and 2 batt's in the back and i should be good with the 2 0g runs of wire. What you thank Quote Link to comment Share on other sites More sharing options...
Guest Posted April 29, 2008 Report Share Posted April 29, 2008 id put a 200+ amp alternator on there to sustain your voltage above 12-13 Quote Link to comment Share on other sites More sharing options...
Nickvb6 Posted April 29, 2008 Author Report Share Posted April 29, 2008 Ok how do you figure the math up? Quote Link to comment Share on other sites More sharing options...
sully Posted April 29, 2008 Report Share Posted April 29, 2008 6k rms, you don't have enough reserve or charging capabilities Quote 2003 Ford F-150 Reg Cab layin body on 26's 2003 Tahoe 3/5 drop on 26's with a 408cid Supercharged engine. 2011 Camaro 2SS 2005 VW GTI Stage II ECU, CAI, 3" turbo back exhaust, FMIC, lowered 2" on some plastidipped 18's 2003 Hayabusa lowered, stretched, cams, nitrous and custom paint Link to comment Share on other sites More sharing options...
missinglink Posted April 29, 2008 Report Share Posted April 29, 2008 Ok how do you figure the math up? Nick: The math is fairly simple. Watts are calculated by multiplying current in Amps times Voltage. 100 amps X 14.7 Volts = 1470 Watts. The RMS output of an amplifier is basically it's DC power rating. RMS Watts = DC Watts in a sine wave situation. It is close enough for basic calculations with audio output, so we will keep using it. So, if you have a 200 amp alternator it can make 200 X 14.7 = 2940 Watts. That is a maximum rating, and without enough cooling it will either shut down or melt eventually. Now for the batteries. 50% discharge is as much as you should push a battery. So if you have a 100 amp/hour battery, you have 50 Ah available. At full charge the resting voltage is 12.65 volts At 50% charge the resting voltage is 12.24 volts. Since the response is fairly linear, we will use the average: 12.65 + 12.24 = 24.89 /2 = 12.445 volts average during discharge. This means that your 100 Ah battery can provide 50 amps x 12.445 volts = 622 watts for one hour, or 1244 watts for a half hour. Now for the bad news. The amplifier is not 100% effecient. That 6,000 watts RMS has peaks much higher than that, and is probably about 80% effecient. The alternator in your car has other work to do, so you can't use all of that power either. You can extend your playing time by adding batteries, but it will also extend your charging time. You can add charging capacity (more alternators), but there are limits on space. The best answer is to add both batteries and charging capacity, and to avoid discharging your batteries too deep. 'Link Quote missinglinkaudio The United States Marine Corps. When it absolutely, positively has to be destroyed overnight - even if "it" belongs to the base commander... Link to comment Share on other sites More sharing options...
Nickvb6 Posted April 29, 2008 Author Report Share Posted April 29, 2008 Ok if i did this should have no problems 2 200amp alts my 2 0g wires with 300amp fuses and another 2 batts in the back. Quote Link to comment Share on other sites More sharing options...
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