Energy storage system discharge depth impact

What is depth of discharge (DOD) in energy storage?

Depth of Discharge (DOD) is another essential parameter in energy storage. It represents the percentage of a battery’s total capacity that has been used in a given cycle. For instance, if you discharge a battery from 80% SOC to 70%, the DOD for that cycle is 10%. The higher the DOD, the more energy has been extracted from the battery in that cycle.

How does deep discharge affect battery life?

Depth of Discharge (DOD) A battery’s lifetime is highly dependent on the DOD. The DOD indicates the percentage of the battery that has been discharged relative to the battery’s overall capacity. Deep discharge reduces the battery’s cycle life, as shown in Fig. 1. Also, overcharging can cause unstable conditions.

What happens when a battery is discharged to an extended depth?

When a battery is discharged to an extended depth, more energy is released during a single discharge cycle. An increase or decrease in discharge depth, for example, from 2.7 V to 2.5 V, generally has a limited effect on the energy efficiency, as shown in Fig. 9 (c).

Does deep discharge depth reduce battery aging costs?

Deep discharge depth increases BESS energy consumption, which can ensure immediate revenue, but accelerates battery aging and increases battery aging costs. The proposed BESS management system considers time-of-use tariffs, supply deviations, and demand variability to minimize the total cost while preventing battery aging.

What are the critical aspects of energy storage?

In this blog, we will explore these critical aspects of energy storage, shedding light on their significance and how they impact the performance and longevity of batteries and other storage systems. State of Charge (SOC) is a fundamental parameter that measures the energy level of a battery or an energy storage system.

How can a battery be discharged at different depths?

Discharging batteries at different depths can be achieved by using different cutoff voltages. When a battery is discharged to an extended depth, more energy is released during a single discharge cycle.