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What is DC charging for EV? Difference between AC and DC charging

2022/04/28 By hqt

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In today article we will be taking you through What is DC charging for EV. Continue to read below.

What is DC?

The term "DC" stands for "Direct Current," which is the type of electricity that the battery demands. Most electric car chargers, on the other hand, use AC (alternating current) power to recharge batteries. Because batteries do not receive AC power, all EVs feature an integrated converter or rectifier. It converts AC power into the DC electricity required to charge electric vehicle batteries. Vehicles receive quick DC charging when there is no conversion.

Don't be intimidated by the various charging options for your new electric vehicle. On your EV adventure, you may come across a few different types of chargers. The three types of electric car chargers you'll come across on the road are Level 1, Level 2, and DC Fast Charging.

What is DC charging for EV?

Electric cars require DC charging

Power from the grid is always AC, as we've learned. The place where the AC electricity is transformed, whether inside or outside the automobile, is the difference between AC and DC charging. Unlike AC chargers, DC chargers have the converter built-in into the device. That means it can supply power straight to the vehicle's battery, bypassing the onboard charger. When it comes to EVs, DC chargers are bigger, quicker, and have amazing development.

DC Fast Charging for Electric Vehicles

What is DC charging for EV? Charge your electric car at home or at a public charging station. You have a few different sorts of chargers to choose from at home. You'll discover DC Fast Chargers at public charging stations, which will charge your EV significantly more quickly.

ChargePoint offers some useful information on how the chargers differ. "Direct current" is what the "DC" in DC Fast Charging stands for. Level 2 chargers are "AC" (alternating current) chargers, comparable to what you'd find in a standard household outlet.

Inside electric vehicles, some chargers can convert AC to DC for quicker charging. This implies that your battery will charge more rapidly, but it will also work harder.

WHY DOES CHARGING THE AIR CONDITIONER TAKE SO LONG?

When you plug in your EV, the converter kicks in and converts the AC electricity into the DC power your batteries require. The charging speed and time required for an EV are affected by the acceptance rate of this converter, which varies by manufacturer. Because this process necessitates the completion of additional work, the AC-powered charging pace is relatively slow. All Level 2 charging stations with a capacity of 7 to 22 kW use AC power from the power station, which is converted to DC by the rectifier. 

THE PROCESS OF FAST CHARGING IN DC - What is dc charging for EV

DC power, on the other hand, skips the converter entirely, allowing the charge to proceed straight to the battery. This quickens the charging process, hence the name "fast" or "rapid" charging. When compared to charging using AC power, what is DC charging for EV? charging with DC power is much faster. In cases where speedy battery replenishment is necessary or desired, DC charging has advantages. The sort of connection used to charge the car is the sole limiting element here.

DC chargers are available in a variety of sizes. Lower-powered chargers may be able to charge up to 50 kW, whereas the quickest chargers may charge up to 180 or 360 kW. Because not many consumer automobiles can handle that much power right now, it's important to know about your vehicle. 

What is DC charging for EV

Don't rely solely on DC Fast Charging

  • Using a quick charger is bad for the battery of your electric vehicle. It should only be used when you're in a hurry or need a rapid charge to get going. This might happen on a road trip or if you're in a hurry and the ice cream in your trunk is melting.
  • Furthermore, quick charging is more costly. Because it charges quickly, it puts additional strain on the battery, which is detrimental to the battery in the long run. While charging, vehicles have a feature known as the "charging curve".
  • Charging normally begins slowly and gradually accelerates as the charge continues. To conserve battery life, disconnect when your battery reaches 80 percent. At that moment, charging will most likely slow down automatically.
  • There are also numerous "does and don'ts" when it comes to EV charging and hogging a DC Fast Charger when someone else is in need is deemed impolite. Be in, get charged, and get out of here.
  • Furthermore, some locations charge a fee for the time your car is plugged into a charger but not charging. This is referred to as an "idle charge".

Charging at Levels 1 and 2

Level 1 charging makes use of a common 120-volt connection as you'd find in a regular outlet. This is adequate for charging, but as you gain experience, you will most likely want to improve. Level 1 charging is sluggish and may take longer than you expect to get fully charged.

Level two charging differs from DC Fast Charging in that it follows a different path. The charger receives AC power from the charging station. Your onboard charger receives electricity from the charger and gives DC power to your battery.

The J1772 connection is commonly seen on Level 2 chargers. You'll need a Combined charging system 1, CCS1, or CHAdeMO connection for Fast Charging.

You may be eligible for a tax credit or rebate if you decide to install a charger at home. Even though Tesla vehicles are no longer eligible, it is claimed that a new government EV refund of up to $10,000 is on the way.

The difference between AC and DC charging for electric vehicles

What is DC charging for EV? When it comes to electric mobility, there are two types of electrical currents that may be utilized to power an EV: AC (alternating current) and DC (direct current) (direct current).

  • When it comes to electric mobility, there are two types of electrical currents that may be utilized to power an EV: AC (alternating current) and DC (direct current) (direct current). But, before we get started, there are a few things to bear in mind:
  • The electricity from the grid, i.e., your household outlet, is always AC (alternating current).
  • All the energy stored in batteries is DC (direct current).

AC and DC, not AC/DC, are the two types of electricity:

Electrical current is divided into two types: AC and DC. Both flow in opposite directions, at different rates, and serve distinct purposes. Despite having an album titled "High Voltage," AC/DC is a hard rock band that has nothing to do with electrical currents or EV charging.

AC is an electrical current or charge flow that alternates in direction regularly. Renewable energy sources that utilize spinning generators, such as wind or hydropower turbines, can create AC electricity. AC can also be efficiently transported over long distances, which is why AC power is used in virtually all of the world's electricity grids, as well as in your home and office.

DC is always in a straight line and may be created using renewable energy sources like solar panels. DC may be utilized for energy storage and LED lighting, among other things. Batteries store DC power, and though you may not know it, the charger transforms AC power from the grid into DC power for your laptop's battery every time you charge it.

In a nutshell, we collect AC electricity from the grid and convert it to DC power so that it may be stored in EV batteries like those used to power electric vehicles.

PROS AND CONS OF DC

DC charging stations feature unique grid connections that allow them to receive and transfer significantly more electricity. Even if there was a method to connect directly to the grid, DC fast-charging stations are large, costly, and require a lot of cooling, so putting such equipment in every car would be impractical.

CHAdeMO chargers range from 25 to 60 kilowatts, while Superchargers are 90 to 120 kilowatts, about 100 times quicker than a regular 120V residential outlet and more than 10 times faster than 240V AC outlets.

The grid could provide even more power at a higher cost, but these limits are mostly intended to avoid damaging the car batteries while charging. (While many factors influence how quickly batteries charge, cars that use Superchargers currently have substantially larger batteries than cars that use CHAdeMO chargers.) If all other factors are equal, larger batteries can safely receive greater power).

Conclusion

Most charging stations available today use AC power. Depending on the automobile you drive and the electricity available to the charging infrastructure, the typical charging speed is 22 kW. Because it takes longer to load, it's best for charging your car at home assess work. What is DC charging for EV? DC charging, on the other hand, is more popular near roads or at public charging stations where there isn't much time to recharge. However, DC charging is finding its way into homes, opening new options for customers because it allows for both rapid and bidirectional charging. 

Read more: what is the best ev home charger?

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