What is the Voltage of a Car Power Supply?
2 Answers
Typically, the output voltage for passenger cars is 12V, while for trucks it is 24V. Below is some information about vehicle power supplies: 1. The operation of a vehicle power supply is quite simple. Insert the vehicle power supply into the cigarette lighter socket, ensure it starts working, and then you can plug the electrical appliance you want to use into the inverter socket of the vehicle power supply. 2. When using a vehicle power supply, make sure that the power of the electrical appliance does not exceed the rated power of the inverter. If the power exceeds the limit, the vehicle power supply inverter may shut down or trigger an alarm.
I've been driving for several years, and the power supply for regular family cars is basically 12 volts. Whether it's charging a phone using the cigarette lighter or connecting a dash cam, everything relies on this voltage. However, trucks and buses are different—they have heavier bodies and more electrical devices, so they require a 24-volt system to handle the load. Once, a friend of mine upgraded the audio system in his off-road vehicle and specifically measured the battery voltage. When the engine was off, it was around 12.6 volts, and after starting, the alternator would raise the voltage to about 14 volts to charge the battery. Nowadays, electric vehicles are even more complex. For example, high-voltage batteries like those in Tesla can reach up to 400 volts, but small electrical devices in the car still operate on a separate 12-volt circuit. During regular maintenance, remember to check the voltage display on the dashboard. If it drops below 11.8 volts, you should inspect the alternator or battery—don’t wait until you’re stranded on the road.
