# Best answer: How long can a car battery power a subwoofer?

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## How long does a car battery last with subwoofer?

With a battery of 40 amp-hours, this gives maximum listening time before the battery dies between 4 and 8 hours. In case that your vehicle has an aftermarket audio system, with an amplifier and subwoofer, current draw can easily go up to 25 amps, which proportionally decreases the time it can run on the car battery.

## How long can a car battery power a sound system?

With modern car audio systems and the most common car battery capacity of around 40Ah, you can run a radio for around 4 to 8 hours, but because car batteries are very sensitive to deep discharges, you should limit using the radio with the engine off to 2-3 hours.

## Does subwoofer drain car battery?

Subwoofers Can Drain Car Battery

Your car battery can get drained when it sends more power than it receives from an alternator. In plain terms, a car battery gets drained when it is not charged enough. When you install a subwoofer into your car, you are basically adding additional load to your electrical system.

## How much power does a car subwoofer use?

Here’s a quick guide based on what you have now: If you have a factory radio: 50-200 watts. If you have an aftermarket receiver: 200-300 watts. If you have amplified speakers with about 50 watts per channel: 250-500 watts.

## Will 1000 watt amp drain battery?

A 1000 watt Amp won’t drain your battery, but a Capacitor is highly recommended.

## How big of an alternator do I need for 2000 watts?

To figure out how much capacity or amperage the alternator must deliver, determine how much extra power the audio system demands on top of the current system. For example, if you installed a 2,000-watt amp, assuming a nominal voltage of 13.5V, you’d add roughly 150 amps of demand to the electrical system.

## How long can I listen to radio with engine off?

As long as the battery is sound, he can play the radio for an hour or two at a time without doing any harm. RAY: If your battery is weak, then he might kill it by playing the radio.

## How long can a car run on battery without alternator?

For the unfortunate souls who realize that this vital part of the vehicle is failing, how long will a car run without an alternator and what can you do to elongate the vehicle’s ability to function? Without this essential component, your car will only function for up to two hours and as little as five minutes.

## How long can car stay on before battery dies?

A new and fully car battery can stay for around two weeks without needing to be recharged from a generator. This battery will fully get discharged after approximately two to three months. If you leave the battery for roughly two and a half months, you will not be able to start the car engine.

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## Do subwoofers use a lot of electricity?

Subwoofers typically only draw their maximum current during tests, and at above Reference level with program material. With program material, the demands are fleeting. You would have to be listening at very very high levels to average more than 300 watts with any commercial sub.

## Are subwoofers illegal?

Sound systems are generally perfectly legal as long as they aren’t impacting the quiet enjoyment of other individual’s homes. Otherwise, you could potentially run into some trouble.