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Champion is a professional electric car charger station manufacturer, with mission "New Energe Makes Space Better".

EV Charging 101: Power, Time & Range

Three important basic concepts of e-mobility
Charging power: With how many kilowatts (kW) can my e-car charge? 

Charging time: How long does it take to charge my electric vehicle?

Range: How far can I get on a full battery charge?

1)How is charging power calculated?

  • Single-phase AC: Power = phases(1) × voltage(230 V) × current(A)
    Example: 1 × 230 V × 16 A ≈ 3.7 kW

  • Three-phase AC (star): Power = phases(3) × voltage(230 V) × current(A)
    Example: 3 × 230 V × 32 A ≈ 22 kW

  • Three-phase AC (delta): Power = √3 × 400 V × current(A)

    Example: √3 × 400 V × 32 A ≈ 22 kW. 

To reach 22 kW, your installation must support three-phase at 32 A. A VW e-Golf charges on two phases; at 230 V/16 A it’s about 7.4 kW

EV Charging 101: Power, Time & Range 1

2) What affects charging power?

  • Battery temperature can throttle power (especially in cold weather)—charge soon after a drive while the pack is warm.

  • State of charge (SoC): charging slows at higher SoC; the 20–80% window often allows higher rates.

3) How to estimate charging time?

Charging time = Battery capacity (kWh) ÷ Charging power (kW)
Since power isn’t constant throughout a session, add ~0.5 h as a buffer. 

  • Tesla Model 3: 75 kWh ÷ 11 kW ≈ 7 h (+0.5 h buffer)

  • VW e-Golf: 35.8 kWh ÷ 7.4 kW ≈ 5 h (at max power). 

4)How to estimate range?

Range (km) = Battery capacity ÷ Consumption per 100 km × 100

  • 85 kWh ÷ 18.1 kWh/100 km × 100 ≈ 469 km

  • VW ID.3:62 kWh ÷ 15.4 kWh/100 km × 100 ≈ 403 km

     

Note:

Values are calculated; real-world range depends on driving style and auxiliary loads, and usable capacity may be slightly less than nominal to protect the battery. 

5) How much power do you need at home?

For overnight home charging, a three-phase 11 kW wallbox already fits most users. Stepping up to 22 kW depends on your vehicle/grid setup and local registration/permit rules. Policies vary by region.

6) Quick takeaways

  • Phases × voltage × current set AC power; three-phase commonly goes up to 22 kW

  • Temperature & SoC strongly affect rates; 20–80% is a good window. 

  • Estimate time with “capacity ÷ power” and add ~0.5 h

  • Range is “capacity ÷ consumption × 100”; treat it as theoretical. 

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Our product line covers intelligent charging devices such as energy storage batteries and new energy electric vehicle charging equipment. 

Contact person: Ian Xu

Phone: +86-18620099949

Email: sales2@zjchampion.cn

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