How Long Does It Take to Fully Charge the Battery at Idle Speed?

[IsabelleMarie]

Different battery capacities require varying charging times. For a 60Ah battery, it takes approximately 2 to 3 hours at idle speed to fully charge. During idle, although the engine speed is low, it can still drive the alternator to work, thus outputting a stable DC voltage. Since the battery power is relatively low, charging is possible at idle speed, albeit at a slower rate. Precautions for Charging at Idle Speed: Avoid Using Other Power-consuming Devices: When the car battery is low and charging at idle speed, the current is low but sufficient to complete the charging process. If additional power-consuming devices are turned on during charging, the battery may be overdrawn, leading to permanent damage. Therefore, during idle speed charging, it is advisable to turn off high-power electrical devices in the car to ensure safer and more reliable charging. No Need to Rev the Engine: Revving the engine to increase speed does not enhance charging efficiency. It is entirely unnecessary to rev the engine while idling. Idle Charging Duration: If the car has been parked for a week, idling for 10 minutes will ensure sufficient charge. For cars parked for over 20 days, idling for 20 to 30 minutes is more reliable.