What is the normal voltage for a car?
2 Answers
The battery used in passenger cars typically has a normal voltage of 12 volts under standard conditions. When the car is not running, the measured battery voltage should not be lower than 11 volts; otherwise, starting difficulties may occur. After starting, the battery voltage will slightly increase, reaching up to 13 volts. There are two types of car voltages: one is 12V, generally used for small and medium-sized cars, and the other is 24V, typically used for large and heavy-duty vehicles. The battery primarily serves as the power source for starting the car in advance. After the car starts, it enters a charging state. When the power is insufficient, the car's power supply system can also charge the battery. The normal service life varies depending on usage habits, typically ranging from three to five years. The battery's working environment should be clean and dry, so it's essential to regularly clean the engine compartment. Remember to remove any debris on the battery. Additionally, during cleaning, ensure that the exterior of the battery remains free of water stains, as this can easily cause a short circuit between the positive and negative terminals, reducing its lifespan.
I used to play around with older cars a lot, so I have some experience with automotive voltage. The normal voltage is a 12-volt system, to be more specific, when the car is turned off, the battery voltage should be between 12.5 and 12.8 volts, which is a healthy indicator. Once you start the engine, the charging system kicks in, and the voltage rises to between 13.5 and 14.8 volts, with a typical value around 14 volts. If it's too low, say dropping below 11 volts, the engine might not start, especially noticeable in cold winter weather. On the other hand, if it's too high, like consistently exceeding 15 volts, electrical components such as bulbs or the radio can easily burn out. I recommend checking the battery terminals with a digital multimeter every few months—it's simple and worry-free. I always keep a small tool in my car to detect issues early. Timely maintenance can also extend the overall lifespan of the vehicle.
