Understanding EV Charging Speed in Miles per Hour
As electric vehicles (EVs) become more mainstream, one of the most common questions EV owners ask is:
“How fast will my EV charge?”
While chargers are usually rated in kilowatts (kW), most drivers think in something far more practical: how many miles of driving range they get for every hour they’re plugged in. This article explains Plugzio charging speeds using a simple, real-world rule of thumb so you can easily understand what to expect.
A Simple Rule of Thumb: Miles per Hour of Charging
A widely used estimate for EV efficiency is:
1 kWh ≈ 3 miles (5 km) of driving range
Using this assumption, we can translate charger power directly into miles added per hour of charging.
Charging speed (miles/hour) = Charger power (kW) × 3
This isn’t exact for every vehicle, but it’s a practical and intuitive way to understand charging performance.
kW vs. kWh (Quick Refresher)
Before we dive into Plugzio chargers, here’s a quick clarification:
kWh (kilowatt-hour) is a unit of energy. It tells you how much electricity your battery can store or use.
Example: a 60 kWh battery can store 60 units of energy.kW (kilowatt) is a unit of power. It tells you how fast energy is delivered.
Example: a 10 kW charger delivers 10 kWh of energy in one hour.
Think of kWh as the size of the fuel tank, and kW as the speed at which the fuel flows in.
Plugzio Charging Speeds in Miles per Hour
Electrical power is calculated using:
Power (kW) = Voltage × Current
Using that, here’s how Plugzio chargers translate into real-world driving range per hour of charging:
Charger | Power (kW) | Miles of Range per Hour* |
Plugzio U+ (120V, 12A) | 1.44 | ~4.3 miles/hour |
Plugzio U+ (120V, 16A) | 1.92 | ~5.8 miles/hour |
Plugzio U+ (240V, 12A) | 2.88 | ~8.6 miles/hour |
Plugzio U+ (240V, 16A) | 3.84 | ~11.5 miles/hour |
Plugzio Cando (240V, 40A) | 9.60 | ~28.8 miles/hour |
Plugzio Artemis (240V, 48A) | 11.52 | ~34.6 miles/hour |
*Based on the 3 miles per kWh rule.
This means that with a Plugzio Artemis, one hour of charging can add over 30 miles of driving range, while even a standard 120V outlet can still add meaningful range overnight.
What Does This Look Like in Real Life?
Let’s walk through a common scenario.
EV battery size: 60 kWh
Current charge: 20% (12 kWh)
Target charge: 80% (48 kWh)
Energy needed: 36 kWh
Using Plugzio U+ (240V, 16A – 3.84 kW)
Charging time:
36 kWh ÷ 3.84 kW ≈ 9.4 hoursDriving range added:
36 kWh × 3 ≈ 108 miles
Using Plugzio Artemis (240V, 48A – 11.52 kW)
Charging time:
36 kWh ÷ 11.52 kW ≈ 3.1 hoursDriving range added:
108 miles (same energy, just delivered faster)
The difference isn’t how far you can go—it’s how quickly you get there.
Factors That Can Affect Charging Speed
While miles-per-hour estimates are very useful, real-world results can vary:
Vehicle efficiency: Some EVs get 4–5 miles per kWh, others closer to 2.5.
Battery behavior: Charging slows as the battery approaches full, especially above 80%.
Weather: Cold temperatures reduce efficiency.
Driving conditions: High speeds and heavy loads consume more energy.
Load balancing: If multiple vehicles are charging on the same circuit, available power may be shared.
Final Takeaway
Instead of thinking in kilowatt-hours, think in miles per hour of charging.
Using the simple rule:
Miles gained per hour ≈ Charger power (kW) × 3
…you can quickly estimate how much driving range one hour of charging will give you on any Plugzio charger. It’s an easy mental model that makes EV charging faster to understand—and easier to plan.
If you know how many miles you drive per day, you already know how fast you need to charge.