Battery Charge Amount of EV

Charge Amount (SOC Increase in 30 minutes) vs Charging Time for both of Home Charging and Quick Charge.

Originally published: 2019-12-20

Last updated: 2026-08-06

EV リーフの充電量　(実測値)

• Tested car: Nissan LEAF

Summary

• The temperature dependence of Charging Speed (SOC Increase per Unit Time) is different in Quick Charge and Normal Charge (Home Charging).
• Quick Charge: The charging speed varies with the environmental temperature as shown here.
• Normal Charge (Home Charging): The charging speed does not depend on the environmental temperature as shown here.

Test Conditions:

• Normal Charger (Home Charging)
• Quick Charger

Normal Charger (Home Charging)

The 200V/15A tap for EV use is used at home. The voltage is measured as 204V。

The braker for EV is 200V/20A.

State of Charge (SOC) vs Charging time

The following figure shows the relation between SOC and the Charging Time. The figure shows there is no temperature dependence.

Conditions:

• Power Source: AC200Volts/15A
• Temperature: 0 to 24 ℃:
  • Pink: 20 to 21℃
  • Orange: 18 to 24 ℃
  • Yellow: 9℃
  • Blue: 1 to 6℃
  • Gray: 1 to 6℃
  • Dark Blue: -0.2 to 3.8℃

SOC increases linearly with Charging Time. The gradients of 6 lines are almost the same, meaning that there is no temperature dependence, although in the case of Quick Charge, the Charging Speed becomes lower at low temperature compared with high temperature.

EV Charging Cost is detailed here.

Quick Charger

SOC Increase in 30 minutes is measured by using EV quick charger. The EV quick charger is 44kWh.

Definitions:

• State of Charge (SOC) is a measure of the level of charge of an electric battery relative to its capacity. It is expressed in percentage.

SOC Increase vs Temperature vs SOC at the Start of Charging

The following 3D figure shows SOC Increase in 30 minutes, the temperature and SOC at the start of charging. The horizontal axis is the measured temperature, and the vertical axis is SOC in 30 minutes. The depth axis is the SOC at the start of charging. Each bar is expressed in 3 colors depending on the SOC at the start of charging (blue < 40%, 40%<yellow<50%, 50%<pink).

• SOC Increase in 30 minutes decreases as the temperature becomes low, and it increases as the temperature becomes high. For example, when the SOC at the start of charging is 32%, SOC Increase in 30 minutes is 50% at 25 ℃, although SOC Increase in 30 minutes is 45% at 15℃.
• SOC Increase in 30 minutes increases when the SOC at the start of charging is low. For example, at 8℃ SOC Increase in 30 minutes is 37%, when SOC at the start of charging is 41%, however SOC Increase in 30 minutes is 30%, when the SOC at the start of charging is 50%.

The following figure is 2D expression, where the SOC at the start of charging is expressed in 3 colors depending on the SOC at the start of charging (blue < 40%, 40%<yellow<50%, 50%<pink). As clearly indicated in the figure below,

• The higher SOC at the start of charging is, the lower SOC Increase in 30 minutes is.
• The lower the temperature is, the lower SOC Increase in 30 minutes is.

Charge Amount (SOC Increase in 30 minutes) vs Temperature (Monthly Average)

Charge Amount vs the charging time (the elapsed time since the start of charging)

As shown above, SOC Increase in 30 minutes varies with the temperature and the SOC at the start of charging. Here, the relation between SOC and the charging time is shown in the following figure. The gradient of each line indicates the Charging Speed. As shown below, the lower the temperature is, the lower the Charging Speed is. The higher SOC at the start of charging is, the lower SOC Increase in 30 minutes is.