3512 Battery Energy

The energy of a battery is measured in terms of capacity and discharge voltage. To calculate energy, the capacity of the battery must be expressed in coulombs. A measurement of 1 Ah is equivalent to 3600 C, while 1 V refers to 1 J (J for joule) of work required to move 1 C charge from the negative to positive electrode. Therefore, the stored electrical potential energy in a 12 V, 100 Ah battery is (12)(3.6*105)J=4.32 MJ. In general, the theoretical stored energy is:

where Vbat is the nominal no load terminal voltage, and QT is the theoretical capacity in C. Therefore, using Equation 3.1, we have

The practical available energy is:

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