Charging of Electric Vehicle, Electric Vehicle Supply Unit (EVSU)

How the electric vehicle charged??


Electric Vehicle Supply Unit (EVSE):

EVSE stands for electric vehicle supply equipment and its function is to supply electric energy to recharge electric vehicles. EVSEs are also known as EV charging stations, electric recharging points or just charging points. EVSEs can provide a charge for the operation of electric vehicles or plug-in hybrid electric-gasoline vehicles. The Public charger makes communication that need to Occur between the EVSE and an electric vehicle. 

Charging Methods And Modes:

 Following are the charging modes for EV batteries
AC Slow Charging Mode
AC Fast Charging Mode
DC Fast Charging Mode

Home/ Private charger

The home private chargers are generally used with 230V/15A single phase plug which can deliver a maximum of up to about 2.5KW of power. Thus, the vehicles can be charged only up to this rate. The billing for the power is part of home-metering.

. Public charger

For charging outside the home premises: the electric power needs to be billed and payment needs to be collected. Further, the charges may depend on state of grid (whether it is power-surplus or is in power-deficit state). The power utilities may also want to manage power drawn by these chargers from time to time. Under AC Charging there are 2 categories of charging.

Normal AC charging

Electric 2-whee lers, 3-wheelers and 4-wheeler vehicles in India has on-board charger that charge at rate of around 2.5kW. These AC 2.5KW Chargers could fast charge a 2-wheeler (for a battery with an energy density of 2KWh) in an hour's time; 4-wheeler or larger vehicles with batteries of 12 KWh or more will be charged in about SIX hours.

Fast AC charging

Worldwide, electric cars like the Nissan Leaf or the Tesla have on board chargers with higher power ratings This enables AC charging at a faster rate, from 7.7 kw to 22 kw.

DC Fast Charging:

In this method of charging, DC current is sent to the electric car's battery directy Via the DC charge port. Fast charge rate (usually 50 KW or more outside India) can supply 100 or more km's of range per hour of charging.

       DC Charging Specifications: Power rating of fast chargers are 10kW/1 5kW/30kW/5OkW or even higher capacity. Voltage rating at which fast charging has to be carried out. 48V/72V for Indian electric cars like the Mahindra e20 Plus P8, Mahindra e-Verito and upcoming Tata electric cars Up to 75OV or even higher used by global electric cars like Nissan Leaf and others.

Level 1 DC Chargers

Public DC Chargers at output voltage of 48V/ 72V, with power outputs of 10 kW / 15 kW with maximum current of up to 200A. Level 2 DC Chargers Public DC Chargers at output voltage up to 1000V, with power outputs of 30 kW / 150 kW


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