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How Many Watts Out Of My Audio System?

I want to buy an amp 4 my car, but how many watts until i need to use another car betery to power my system?

  • im thinking of buying 2 Sony Mono-Channel Amplifier (XMD9001GTR) Power (watts RMS into 4 ohms x channels) 550 x 1 Power (watts RMS into 2 ohms x channels) 900 x 1 Distortion (THD%) at rated power 1% Bridged power x channels (4 ohms) ? 550 x 1 Peak power x channels (watts) ? 1300 x 1 will this much power require me to buy a new battery to power them up? Oh yeah and im buying 2 kicker l7's (1500 watts each peak power)

  • Answer:

    Depending on the amperes of your alternator, you might be ok. A second battery is never the answer and is only a band-aid to a problem that will come back. If your alternator is 35 amps, then you will need to upgrade. Most standard sized cars are 65-75 amps and SUV's are around 145 amperes. To calculate the approximate average power consumption, multiply the total watts RMS of the amplifier(s) by two and divide by the voltage of the car when running (13.8 volts). Divide this number by three for inefficiency. 550 * 2 *2 (you said two of them) 2200 / 13.8 = 159.42 159.42 / 3 = 53.14 ampres This is an average approximation and can go higher. So I would gather between 54 and 80 amperes for this system.

Bryan M at Yahoo! Answers Visit the source

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All the battery does is start the car and provide power when the car is not running. When running, the alternator provides the juice to your electronics. This equation: watts/volts=peak amp draw shows the potential draw on your alternator. In your case it is 92 amps peak. This assumes you use the right power wire guage among other things. I would suggest upgrading your alternator for best results. Not many factory alternators put out enough juice to support that draw plus the cars needs.

Mythos

Most of those Mercedes have fairly stout alternators. As far as your battery. The only time you really need to upgrade or add another is if you plan on playing your system for extended periods of time with the engine off.

Bmc420

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