A 40 amp EV charger delivers 9.6 kW on a 240V circuit, which puts it at the faster end of Level 2 charging. In simple terms it adds roughly 9.6 kWh to the battery for every hour plugged in, so a 60 kWh battery takes about 6 to 7 hours from empty in practice, and a typical overnight top-up takes far less. The U.S. Department of Transportation places Level 2 charging at 7–19 kW overall, adding about 10–20 miles of range per hour depending on the car.
Key Takeaways
- A 40 A charger delivers 9.6 kW and needs a 50 A breaker.
- It fills a 60 kWh battery in roughly 6 to 7 hours in practice, and daily top-ups in about 1–2 hours.
- A 48 A charger gives about 11.5 kW on a 60 A breaker, roughly 20% faster.
- Choose by your circuit capacity and routine, not by the biggest number.
The Numbers: Amps to Kilowatts to Hours
Power is amps multiplied by volts. At 240V, the common settings work out as follows. Charge time is simple division, battery size divided by kilowatts, using a 60 kWh pack as the example. Real sessions run a little longer because charging slows near full and no system is perfectly efficient.
| Charger setting | Power at 240V | Breaker required | 60 kWh battery, empty to full (simple division) |
|---|---|---|---|
| 32 A | About 7.7 kW | 40 A | About 7.8 hours |
| 40 A | 9.6 kW | 50 A | About 6.3 hours |
| 48 A | About 11.5 kW | 60 A | About 5.2 hours |
The breaker column follows the National Electrical Code rule for continuous loads: the breaker is sized at 125% of the charger’s current, so 40 A of charging needs a 50 A breaker and 48 A needs 60 A. Our guide to how many amps an EV charger needs walks through choosing a setting for your panel.
What 9.6 kW Feels Like Day to Day
Most drivers do not charge from empty. A car that comes home having used 15 kWh during the day replaces that energy in about an hour and a half at 40 A. Plugged in overnight, a 40 A charger can return even a large battery to full by morning in almost every routine. That is why 40 A is a common sweet spot: it needs only a 50 A circuit, which many panels can support, and it covers daily driving with hours to spare.
For context against slower options, our comparison of Level 1, Level 2 and DC fast charging shows Level 1 at about 1 kW. A 40 A charger is roughly ten times that speed, which is the difference between planning around the car and forgetting about it.
And a 48 Amp Charger?
A 48 A charger delivers about 11.5 kW, roughly 20% more than 40 A. On the same 60 kWh example it cuts a full charge from about 6.3 hours to about 5.2 hours. That saving matters if you regularly arrive home late with a nearly empty large battery, or share one charger between two cars. It matters far less for a single car with a normal commute, and it needs a 60 A circuit, which can mean a panel upgrade the 40 A option avoids. The fastest home chargers all live in this 48 A class for North America.
Choosing Between 40 A and 48 A Hardware
Two EVDANCE options cover the two settings. The EV-ACS4005T 40A portable charger delivers 9.6 kW from a NEMA 14-50 outlet, adjusts between 16, 24, 32 and 40 A, and is rated IP66 with a 25 or 28 ft cable. The EV-ACT5006T 48A wall charger reaches about 11.5 kW, hard-wired or on a NEMA 14-50 plug, with a 25 ft cable and IP65/IP66 rating. An adjustable charger set lower still charges at the lower rate, so match the setting to the circuit, not the other way round. Installation planning for either belongs with the wallbox installation guide and a licensed electrician.
Frequently Asked Questions
How many miles of range does a 40 amp charger add per hour?
It depends on how efficient the car is. The DOT puts Level 2 charging overall at about 10–20 miles of range per hour, and a 9.6 kW charger sits in the upper part of that band. Your car’s consumption figure gives the exact answer.
Can I run a 40 amp charger on a 40 amp breaker?
No. EV charging is a continuous load, so the breaker is sized at 125% of the charging current. A 40 A charger needs a 50 A breaker and wiring to match.
Is 48 amp charging bad for the battery?
Both 40 A and 48 A are ordinary Level 2 AC charging, far below DC fast charging rates. Battery life depends far more on temperature and state of charge habits; DOE guidance notes EV batteries may last 12–15 years in moderate climates.
Related Reading
- How Many Amps Does an EV Charger Need?
- What Is the Fastest Home EV Charger?
- Level 1 vs Level 2 vs DC Fast Charging: A Practical Comparison
- Wallbox Home Charger Installation Guide 2026
