How many hours does it take to charge a 72V 20Ah battery?
3 Answers
For an electric vehicle equipped with a 72V 20Ah battery, the charging time from a fully discharged state is approximately 8 to 10 hours. Below are detailed explanations: 1. Charging Duration For an electric vehicle equipped with a 72V 20Ah battery, the charging time from a fully discharged state is approximately 8 to 10 hours. It is generally recommended to continue floating charging for 2 hours after the indicator light turns green before disconnecting the power. 2. Charging Capacity For lead-acid batteries used in electric vehicles, the typical charging capacity is 1.05 times the discharged capacity. For a 72V 20Ah battery, assuming it is fully discharged (i.e., at rated capacity), the required charging capacity would be 20 * 1.05 = 21Ah. With an average charging voltage of 77.4V, the total power consumption is approximately 1.63 kWh.
As a seasoned electric bike rider, I must remind you that the charging time for a 72V 20Ah battery depends on the charger's output current. With a standard charger outputting around 5 amps, a simple calculation shows: 20Ah divided by 5A equals roughly 4 hours. However, factors like battery aging or ambient temperature differences may extend this by an hour or so. Never rush charging—always use standard output to preserve battery lifespan. I make it a habit to check connection wires for tightness after each full charge to prevent short-circuit accidents. To save costs, I recommend charging during off-peak hours at home—it's cheaper and more convenient. Remember, for long-term storage, top up the battery every two weeks to maintain its health.
My electric vehicle has a 72V 20Ah configuration, and I've got some experience with charging. With a standard 5A charger, it takes about 4 hours for a full charge. If you use a faster charger with higher output like 10A, it can be done in two hours, but I don't recommend it because frequent fast charging accelerates battery aging. Personally, I think it's best not to rush charging and choose to charge at night when the temperature is stable for optimal results. Additionally, regularly clean the charging port to avoid poor contact and prolong charging time. In short, calculating the charging time based on the current marked on the charger label is the most reliable way—safe and cost-effective.
