What Voltage is Required for a Car Battery to Start the Vehicle?

[LaIris]

After the car is started, the voltage should generally be between 13.4V and 14.8V. If the voltage is below 13.4V, the battery may not be charging properly; please check the engine or the load of other electrical devices. When the voltage exceeds 14.8V, it may damage the battery; please inspect the engine stabilizer. More relevant information is as follows: 1. Vehicle system voltage: For a 12-volt system, the voltage should be between 13.5V and 14.5V; for a 24-volt system, it should be between 27V and 29V. For a 12V system, the battery voltage should be around 13V when unloaded, and no lower than 11V under load to be considered normal. 2. Difficulty starting: If the voltage is below these values, the vehicle may have difficulty starting. For a 24V system, the battery voltage should be around 26V when unloaded, and no lower than 22V under load to be considered normal. If the voltage is below these values, the vehicle may have difficulty starting. 3. Low-voltage conversion: When converting the battery voltage to a low voltage (e.g., 3.3V) with a power output of 3W, a high-end switching converter is required. This type of converter can provide an output power of over 30W. This is also why automotive power supply manufacturers typically opt for switching power supply solutions rather than traditional LDO-based architectures.