What is the minimum voltage at the moment of ignition start?

[Allison]

The minimum voltage at the moment of ignition start is approximately 10.8V. Regarding car batteries, the charging voltage typically should not exceed 14.4V. The lower limit of voltage during ignition start is around 10.8V, while the voltage during startup is about 11.8V, and the voltage after startup is around 14V. When the battery voltage drops below 10V, it indicates severe battery depletion, and the car usually cannot be started, requiring a recharge. Below is an introduction to car batteries: 1. Function of the battery: The battery, also known as a storage battery, provides electrical energy for starting the car and adjusts the imbalance between the generator's output and the load. (1) When the engine is running, the generator primarily supplies power to various electrical devices. If the generator produces excess electricity, the surplus is stored by charging the battery. When the engine starts or the generator's output voltage is too low to power the electrical devices, the battery supplies the power. (2) When the engine is not running, the battery powers the electrical devices. If the power demand of the electrical devices exceeds the generator's output, the battery and generator work together to supply power. If the power demand is less than the generator's output, the generator powers both the battery and the electrical devices. If the generator fails, the battery can provide emergency power, ensuring the car's electrical devices can operate for a short time. 2. Battery maintenance: Modern maintenance-free batteries often use alloy grids, enhancing corrosion resistance and tensile strength. The lost electrolyte during charging can quickly flow back, eliminating the need for liquid replenishment. Maintenance-free batteries typically have strong overcharge resistance, long energy storage duration, and can provide stable high-current output. When using maintenance-free batteries, note that if they are excessively discharged and not recharged promptly, their lifespan will be shortened. Therefore, for cars parked for extended periods, it is advisable to start the car every 25 days or so and let it idle for about 10 minutes. Otherwise, prolonged parking may lead to excessive discharge, making the car unable to start. Additionally, in winter, if the car has difficulty starting and repeated ignition attempts are made, it can cause excessive battery discharge and damage.