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What Is DOD Of Battery ?
- Apr 10, 2018 -

What is DOD of battery ?


Depth of Discharge (DoD) is an alternate method to indicate a battery's state of charge (SoC). The DoD is the complement of SoC: as one increases, the other decreases. While the SoC units are percent points (0% = empty; 100% = full), DoD can use Ah units (e.g.: 0 = full, 50 Ah = empty) or percent points (100% = empty; 0% = full). As a battery may actually have higher capacity than its nominal rating, it is possible for the DoD value to exceed the full value (e.g.: 55 Ah or 110%).

At least in some battery technologies such as lead-acid AGM batteries there is a correlation between the Depth of discharge and the Cycle life of the battery.Depth of Discharge (DOD) is defined as: Capacity in Ampere Hours (Ah) that is discharged from a fully charged battery, divided by battery nominal capacity (C20). DOD is normally presented in percent (%). Example: if a 100Ah battery is discharged for 20 minutes at 50A, the Depth of Discharge is: 50*(20/60)/100= 16.7%

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Why does DOD matter to solar batteries?

Because DOD and the cycle life of batteries are closely linked, it is important to know that the more you fully discharge your battery, the more chances that it will degrade quickly. Similarly, the more discharge cycles that a battery undergoes, the faster it will degrade. Therefore, the maximum DOD for the cycle life of a battery matters in its overall value. It is highly advisably to keep the maximum DOD for your battery at the allowable depth which is 80% to maintain the life of your deep cycle batteries.