The discharge capacity of lead-acid batteries is determined based on a 10 hour discharge rate. If a 200AH lead-acid battery is to be discharged at full capacity, the discharge current should not exceed 20A (200Ah/10h); If the discharge current is greater than 20A, the discharge capacity cannot reach 200AH; For example, when the discharge current is 200A, the discharge time can only last for about half an hour, and the discharge capacity is about 100AH; It is generally advocated that the working current of lead-acid batteries should not exceed the current value calculated based on a 1-hour discharge rate, that is, not more than 200Ah/1h=200A; A higher working current is allowed, but the discharge duration is too short.
2V200ah can output a current of 200 amps in 10 hours. The nominal voltage of lead-acid batteries is 2V/(per unit or cell), but in reality, it is slightly higher than 2V. Therefore, in actual use, 104, 103, and 108 lead-acid batteries are selected to match the charging equipment. A 2V battery has a large capacity (ranging from 200AH-3000AH), a long design life, good stability, and is also expensive; The maximum capacity of a 12V battery is generally 250AH, and its design life is not as good as 2V. It is cost-effective and better for high current discharge.
capacity unit; Usually, when we talk about battery capacity, it is measured in ampere hours, which is based on a predetermined battery. For example, what is the battery capacity of this mobile phone; What is the capacity of this electric scooter battery? They are all specific to different batteries. The battery voltage has been determined without considering the actual voltage, and simply stating ampere hours can represent the capacity of this battery. However, for batteries with different voltages, we cannot simply use ampere hours to represent capacity. For example, a 12V 20AH battery, a 15V20AH battery, even if they are both 20AH, can supply the same power load and the equipment can work normally, but the duration is different. Therefore, the standard capacity should be measured in power.
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