Will a twelve volt battery run 300 watts?

Answer 1

In principle a twelve volt battery (or battery of any voltage) can run a 300 watts load (or any load). However, there are practical problems. As we know, Power = Voltage x Current . Hence, a 300 watts load at 12 V will require a current of 300/12 = 25 A. To carry a 25 A current a conductor of very large cross sectional area will be required. Apart from the practical problem of handling such a thick cable, the cost considerations rule out this option because the cost of such a cable will be much larger than the additional cost of a higher voltage battery. A # 10 copper wire will carry 30 amps.

Answer 2

A normal battery is ~80 Amp hours. so a 12 v draw at 25 Amps = 300 W. The battery will last about 80/25 = 3.2 hours. Then it is dead and you cant start the car. If you run it for 1 hour the car might still start. But with an old battery it can be 50% less time.

Answer 3

Yes, a twelve volt battery can run a 300 watt device. To calculate the current draw, use the formula: current (amps) = power (watts) / voltage (volts). In this case, 300 watts / 12 volts = 25 amps. Make sure the battery can provide enough current to run the device safely.

Answer 4

If the amplifier's supply voltage requires 12 volts then yes. Make sure the wires supplying the voltage are # 12 as the amplifier will be drawing 16.6 amperes. Use an in line fuse of 20 amps.