Decoding the Charge: Navigating AC and DC Charging for TeleEV

Decoding the Charge: Navigating AC and DC Charging for TeleEV

Electricity serves as the lifeblood of all electric vehicles, and understanding its nuances is crucial. Not all electricity is equal, with two primary types of electrical current—Alternating Current (AC) and Direct Current (DC). In this blog post, we'll unravel the distinctions between AC and DC charging, shedding light on their impact on the electric vehicle (EV) charging process.

Before delving into the details, it's essential to clarify a fundamental point. AC, or Alternating Current, is the electricity that comes from the power grid, such as your household outlet. On the other hand, DC, or Direct Current, is the energy stored in your electric car battery.

EV Charging: AC vs. DC

AC Power: AC, or Alternating Current, is characterized by the periodic change in direction of electric voltage and current. This shift occurs at a frequency of 50 or 60 Hz, giving rise to the term "alternating current." The electricity flowing through power lines and into homes is AC, accessible through power outlets.

DC Power: DC, or Direct Current, maintains a constant flow of electric power in a single direction. It is commonly used in devices requiring a stable power source, such as computers, televisions, and smartphones. EV batteries and solar panels generate DC power, offering a continuous flow of electrical current.

AC and DC Charging: Pros and Cons

AC Charging Pros:

  1. Accessibility: AC charging is widely accessible, allowing EV drivers to charge at home, work, or public places without specialized equipment.
  2. Safety: AC charging is generally considered safer due to its sine waveform, posing a lower risk of electrical shock.
  3. Affordability: With no need for specialized infrastructure, AC charging is a cost-effective option for most users.

AC Charging Cons:

  1. Slow Charging Times: AC chargers have limited power, resulting in slower charging times compared to DC stations.
  2. Energy Efficiency: AC chargers are less energy-efficient than ultra-fast charging stations, with a conversion process leading to some energy loss.

DC Charging Pros:

  1. Fast Charging: DC charging is the fastest method, capable of charging an EV in as little as 20-30 minutes.
  2. Efficiency: With a built-in converter, DC chargers deliver energy directly to car batteries, increasing charging speed.

DC Charging Cons:

  1. Accessibility: Rapid charging stations may be sparse in certain regions, and not all public stations offer fast charging.
  2. Cost: DC charging can be more expensive than AC, with some stations charging fees, making it pricier for users.

Battery Degradation: Frequent fast charging, common with DC charging, can adversely affect a car's battery. The charging curve exhibits degradation, starting rapidly but gradually slowing down as the battery nears maximum capacity. In contrast, AC power maintains a flat line, with the onboard charger accepting limited power over longer periods.

Differences between AC and DC Chargers:

  • AC Chargers: Utilize a sine waveform to deliver power, with voltages typically between 110-240V. Charging times range from hours to days, making it suitable for home charging.
  • DC Chargers: Significantly faster and more efficient, using a constant waveform with voltages between 400-800V. Charging times can be as short as 20-30 minutes but are typically found in commercial charging stations.

Mixing AC and DC Charging: Combining AC and DC charging can be a practical solution for EV owners. Using AC charging for daily needs and reserving DC charging for long-distance travel provides flexibility and accessibility. Hybrid chargers that offer both AC and DC capabilities are also emerging as versatile options.


  1. How does a vehicle battery work?

    • EVs use lithium-ion batteries, releasing lithium ions during charging and reabsorbing them during discharging, creating electrical energy.
  2. Is AC or DC better for charging?

    • It depends on your needs. AC is suitable for daily use, while DC offers faster charging, ideal for long-distance travel.
  3. Does DC charge faster than AC?

    • Yes, DC charging is faster, delivering 0-80% charge in as little as 20 minutes.
  4. Is Tesla AC or DC charging?

    • Tesla uses both AC and DC charging, with Superchargers using direct current. 
  5. Is AC charging better for batteries?

    • AC charging is considered better for battery health in the long run, as it imposes less strain.
  6. Do EVs run on AC or DC?

    • EVs run on direct current, as both the battery and the electric motor operate on DC power.

For your TeleEV charging needs, explore TeleEV's range of EV chargers, adapters, and more designed for Tesla and J1772 EVs.

Back to blog

Leave a comment

Please note, comments need to be approved before they are published.