15Oct, 17 October 15, 2017-
  • By admin

There are three main types of EV charging – rapid, fast, and slow. These represent the power outputs, and therefore charging speeds, available to charge an EV. Note that power is measured in kilowatts (kW). (Read More…)

Rapid chargers are one of two types –

AC or DC [Alternate or Direct Current]. Current Rapid
AC chargers are rated at 43 kW, while most Rapid DC units are at least 50 kW. Both will charge the majority of EVs to 80% in around 30-60 minutes (depending a battery capacity). Tesla Superchargersare also Rapid DC and charge at around 120 kW. Rapid AC devices use a tethered Type 2 connector,and Rapid DC chargers are fitted with a CCS, CHAdeMO or Tesla Type 2.

Fast chargers include those which provide power from 7 kW to 22 kW, which typically fully charge an EV in 3-4 hours. Common fast connectors are a tethered Type 1 or a Type 2 socket (via a connector cable supplied with the vehicle).

Slow units (up to 3 kW) are best used for overnight charging and usually take between 6 and 12 hours for a pure-EV, or 2-4 hours for a PHEV. EVs charge on slow devices using a cable which connects the vehicle to a 3-pin or Type 2 socket.

How to charge an EV at home

Charging at home is often the most convenient and cost effective way to recharge an EV. Government grants are available for the installation of home EV charge points, and a large number of companies offer a fully installed charge point for a fixed price. Most home chargers are either rated at 3 kW or 7 kW. The higher powered wall-mounted units normally cost more than the slower 3 kW option, and halve the time required to fully charge an EV. Many plug-in car manufacturers have deals or partnerships with charge point suppliers, and in some cases provide a free home charge point as part of a new car purchase. In most cases, home-based charging requires off-street parking to avoid trailing cables across public footpaths and public areas. All EV charging units are wired directly to the central metering unit, usually on its own circuit for safety and to enable monitoring separate from other electrical loads. While less common, on-street residential charging units are becoming available in some local authority areas.

How to charge an EV at work 

An increasing number of companies are installing workplace EV charging units for use by employees and visitors. As with home-based charging, plugging-in an EV at the workplace charging makes sense as an employee vehicle will typically be stationary for most of the day when it can be conveniently charged.

About Bharat Charging Specifications

Having multiple charging protocols is a pain point in the electric vehicle industry. The world is spending more
money than necessary to support multiple charging protocols. For example, Tesla Motors is spending lots of
money building a proprietary charging network that can only be used by owners of Tesla’s automobiles, while
at the same time the charging network operators are spending lots of money to build out fast charging for the
other protocols.
We don't want the same thing to happen in India. We dont want a Mahindra or a Maruti or a Tata to develop
their own standards.
Thus the need for Bharat EV specifications for AC and DC charging.
We commend our government for stepping up and giving direction to the Indian EV industry.

Home Charging
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. This will be continued till
a policy evolves to charge the home users differently for EV use. Also Bharat EV Specs
recommends using the IEC 60309 Industrial connector from both ends.
Public Charging
For charging outside the home premises, Bharat EV standards recommends that the electric
power needs to be billed and payment needs to be collected. The power utilities may also
want to manage power drawn by these chargers from time to time.

AC Plug Connectors
Indian electric cars use the IEC 60309 Industrial Blue connectors and Bharat EV specifications recommend
using this plug.
Global EV's use the IEC 62196 Type 2 connector (commonly referred to as Mennekes). This plug was selected
by the European Commission as official charging plug within the European Union. It has since been adopted as
the recommended connector in countries outside of Europe.

As per Bharat DC Charging Specifications,
Power rating of fast chargers are
1. 10kW/15kW/30kW/50kW or even higher capacity.
Voltage rating at which fast charging has to be carried out:
2. 48V/72V for Indian electric cars like the Mahindra e2o Plus P8, Mahindra e-Verito
and upcoming Tata electric cars.
3. Up to 750V or even higher used by global electric cars like Nissan Leaf and others.