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How long does it take to charge a car while idling in place?

1 Answers

VonDamian

07/30/25 5:28am

It takes about 1 hour of idling in place to fully charge a car battery. If the car is not driven frequently and there is concern about battery drain, it is recommended to start the car and let it idle for about 20 minutes each week. Additional information: 1. Factors affecting charging duration: The charging time can also be influenced by other factors, such as whether high-power devices are being used inside the car, whether the air conditioning is on, or if external USB power is being supplied, all of which can increase the charging time. 2. Calculation of charging time: The formula for calculating battery charging time is T = (Capacity) / (Charging Current). For example, if a car battery has a capacity of 60Ah and the engine idling charging current is 30A, the theoretical time for a full charge would be 2 hours.

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