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How many amps is a good alternator?

The amp rating of the alternator is matched to the vehicle’s electrical system. Older vehicles with fewer accessories may only need a 70- or 80-amp alternator, while a newer vehicle with lots of electronics and accessories may need a 120- to 160-amp alternator.


How do I know what amp to get for my alternator?

Your alternator should be capable of delivering rated output equal to the maximum acceptance rate of your house battery bank. In other words, the alternator’s rating should be equal to 25 percent (lead acid) 30 percent (gel) or 45 percent (AGM) of your total battery capacity.


How much horsepower does it take to run a 100 amp alternator?

An alternator takes about 1 HP for every 25 Amps of power. At full output, a 100 Amp alternator will need about 4 HP. For a long time, most alternators don’t operate at full output.


What does a higher amp alternator do?

You’re able to reduce the depth of a battery’s discharge—also known as cycling. That’s because an oversized alternator produces more output at lower speeds, including idle. That increased output prevents the battery from having to help supply the load—and this keeps it at a more ideal state of charge.


What size alternator do I need for 3000 watts?

3000 watt / 12V is equal to 250A. A 250A alternator is needed to keep up with it. Since your engine would have to work just as hard as any portable 3KW generator to keep up with the amplifier, you would need a large fuel tank.

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Can an alternator run an electric motor?

The humble automotive alternator hides an interesting secret. Known as the part that converts power from internal combustion into the electricity needed to run everything else, they can also themselves be used as an electric motor.


How do I know if I need a bigger alternator?

When should you upgrade your Battery or Alternator? Here are a few tell-tale signs that it is time to upgrade your car’s alternator to something that can output enough power to meet the demands of your stereo: If your lights start to dim when music is playing, which will be most noticeable during songs with more bass.


Can you overload an alternator?

An alternator can be damaged by improperly jumping a car (such as having the wires crossed), which can overload and fry circuits. Also, if the connection from the alternator to the battery is severed while the engine is running, the alternator can become overloaded and damaged.


Why would you need a heavy duty alternator?

If you use a stock alternator, your battery won’t last long because it doesn’t have the endurance to handle your audio upgrade. Installing a high-output alternator helps you support your heavy-duty system or other demanding applications to your car.


What size alternator do I need for 2000 watt amp?

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.

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