Can a Vehicle Charge While Idling?

[LeMaddox]

Vehicles can charge while idling, but the charging efficiency is poor. After the engine starts, the electricity generated by the alternator is primarily used to power the vehicle's electrical systems, leaving little surplus current. The charging current only becomes sufficient when the engine speed exceeds 2,000 RPM, making idling charging inadvisable. Below are detailed explanations: 1. Modern vehicles use AC generators. The battery's power is mainly consumed during engine startup, which requires a significant amount. However, once the engine is running, the battery is no longer drained. 2. The power consumed during startup is replenished through the vehicle's charging circuit. While charging is possible at idle speed, the charging current remains relatively low. 3. Typical passenger car batteries have capacities ranging from 54-60Ah. Battery capacity indicates the amount of electricity discharged under specific conditions (discharge rate, temperature, cutoff voltage, etc.). 4. Automotive battery capacity is measured in Ah (Ampere-hours). For example, a 60Ah battery can continuously discharge 1A for 60 hours.