Can a Car Charge the Battery at Idle Speed, and How Long Does It Take?

[McBrynlee]

Car idling can charge the battery, and it generally takes about one hour to fully charge the battery. Here are the relevant details: 1. Introduction: Idle speed refers to the operation of the engine under no load, where it only needs to overcome the frictional resistance of its internal components without delivering power externally. The minimum speed required to maintain stable engine operation is called idle speed, which is one of the five basic operating conditions of an engine. For an engine with good performance, the idle speed is typically between 550-800 RPM. 2. Charging Principle: Charging the battery while the car is idling in place takes about one hour to fully charge the battery. The car charging process essentially involves the engine driving the generator to produce electricity, which is then rectified and regulated to provide a slightly higher voltage than the battery voltage, enabling constant voltage charging.