Are EV battery losses localized in EV charging and discharging?

The results presented in section 4 show that losses are highly localized whether in EV charging or in GIV charging and discharging. Loss in the battery and in PEU depends on both current and battery SOC. Quantitatively, the PEU is responsible for the largest amount of loss, which varies widely based on the two aforementioned factors.

What is the percentage charging loss for a 10amp battery?

According to , for low currents charging and discharging battery losses are equal, while for higher currents, the discharging losses are approximately 10% more compared to the charging losses. Therefore, the battery percentage charging losses for 10Amps are 0.64%, and for 70Amps are 2.9%.

How is energy storage capacity calculated?

The energy storage capacity, E, is calculated using the efficiency calculated above to represent energy losses in the BESS itself. This is an approximation since actual battery efficiency will depend on operating parameters such as charge/discharge rate (Amps) and temperature.

How are power losses measured?

First, power losses are extensively measured, from grid to the EV battery and back to the grid, under different conditions. These measurements are generalized by deriving functions to predict power losses.

What is the difference between charging and discharging?

Generally, with some exceptions, percentage losses are higher at lower current, more consistently for charging than discharging. Some very high losses are found at low SOC (again, with exceptions). For charging, generally the higher efficiencies are achieved at higher SOC and higher current.

Why is measurement of power loss important?

The increased throughput makes measurement of power loss important to achieve efficient operation. Round-trip power losses from the grid entry point to the storage battery are measured, through a series of experiments that put the system under charging and discharging cycles.