Depth of discharge
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Depth of Discharge (DoD) is the fraction or percentage of the capacity which has been removed from the fully charged battery. It is an alternative method to indicate a battery's State of Charge (SoC). The Depth of Discharge is the complement of State of Charge: as one increases, the other decreases.[1]
While the State of Charge (SoC) is usually expressed using percentage points (0% = empty; 100% = full), Depth of Discharge (DoD) is either expressed using units of Ah (e.g for a 50 Ah battery, 0 Ah is full and 50 Ah is empty) or percentage points (100% is empty and 0% is full). The capacity of a battery may be higher than its nominal rating. Thus it is possible for the depth of discharge value to exceed the nominal value (e.g., 55 Ah for a 50 Ah battery, or 110%).
At almost all known rechargeable battery technologies, such as lead-acid batteries of all kinds like AGM, there is a correlation between the depth of discharge and the cycle life of the battery.[2] Depth of Discharge is defined as the total amount of energy that is discharged from a battery, divided by the battery nominal capacity. Depth of discharge is normally expressed as a percentage. For example, if a 90 Ah battery is discharged for 20 minutes at a constant current of 50 A, the depth of discharge is : (100% * (50 amps * ((20 mins / 60 mins) hours))) / 90Ah == (100% * (50A * 0.33333h)) / 90Ah == (100% * 16,67Ah) / 90Ah == 1667%Ah / 90Ah = 18.522% .
See also
- Battery balancing
- Smart Battery
- Battery charger
- Deep-cycle battery
- State of health
- Battery management system
References
- ^ "The relationship between coefficient of restitution and state of charge of zinc alkaline primary LR6 batteries" (PDF). doi:10.1039/C5TA01576F.
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(help) - ^ support.rollsbattery.com:AGM discharge characteristics