An AC charger is the wallbox or portable unit that supplies alternating-current power from your building to your car. Its technical name is EVSE — electric vehicle supply equipment — because it does not convert anything: the conversion from AC to DC happens inside the car, in its onboard charger. That one fact explains the unit’s parts, its ratings and its speed limits.
Key Takeaways
- An AC charger supplies AC power; the car’s onboard charger converts it to DC.
- EVSE is the technical name for the same unit — wallbox, portable cable or public AC post.
- Its jobs are offering a current limit, keeping the connector unpowered until connected, and monitoring the session.
- Read the amps first: at 240 V, 32 A is about 7.7 kW and 48 A about 11.5 kW.
Why It Is Not Quite a Charger
Batteries store DC, and the grid supplies AC. With AC charging, the box on the wall passes AC through and the car’s onboard charger does the converting, which is why AC charging runs at the U.S. DOT’s Level 1 and Level 2 speeds — about 1 kW for Level 1, and 7 to 19 kW for Level 2. DC fast chargers are different machines with the converter built into the station. Our comparison of whether EV chargers are AC or DC covers that split in full; this article stays with the AC unit itself.
The Parts and What Each One Does
| Part | What it does |
|---|---|
| Connector and cable | Carries the AC power to the car and locks in place during the session |
| Control electronics and pilot signal | Tells the car the maximum current it may draw, so the car never takes more than the circuit and the unit allow |
| Contactor (internal switch) | Keeps the connector unpowered until a car is properly connected, and cuts power when the session ends or you unplug |
| Protective electronics | Monitors the supply for faults and stops the session if something is wrong |
| Metering and smart control (on many models) | Records energy delivered and adds schedules, app control or RFID access |
So the wall unit is best understood as a guarded, metered gateway: it decides how much current is on offer, keeps the connector safe to handle, and watches the session — while the car decides how much of the offer to take. How home EV chargers work walks through a session from plug-in to full.
How to Read an AC Charger’s Ratings
- Amps come first. Power is amps times volts: a 32 A unit on a 240 V supply delivers about 7.7 kW, a 40 A unit about 9.6 kW, and a 48 A unit about 11.5 kW.
- Adjustable current is a feature, not a flaw. Charging is a continuous load under the National Electrical Code, so the breaker is sized at 125% of the charger’s current — 32 A needs a 40 A breaker, 48 A a 60 A breaker. Steps let one unit suit different circuits.
- The car can still be the limit. If the car’s onboard charger accepts less than the unit offers, the car wins — the Level 1, Level 2 and DC fast comparison shows the resulting charge times.
- IP ratings describe the enclosure. IP65 and IP66 units are built for outdoor mounting; our IP ratings guide explains the numbers.
Two Shapes of the Same Job
A portable unit and a wallbox are both AC chargers; the shape is a lifestyle choice. The EVDANCE EV-ACS3210T 32A NACS portable charger delivers about 7.7 kW from a NEMA 14-50 outlet, adjusts from 10 to 32 A in six steps, and is IP66 rated. The EVDANCE EV-ACT5006T 48A Level 2 wall charger is the fixed version: up to 48 A hard-wired or on a NEMA 14-50 plug, with ETL, FCC and CE listings. A licensed electrician should confirm your circuit before either is fitted.
Frequently Asked Questions
Is a Level 1 charging cable an AC charger?
Yes. The portable cable that plugs into a household outlet is AC supply equipment too, just limited to about 1 kW. Level 1 and Level 2 differ in power, not in kind.
Why does my car charge more slowly than the charger’s rating?
Usually because the car’s onboard charger accepts less than the unit offers, or the circuit limits the unit’s setting. The lower of the ratings — car, charger, circuit — sets the speed.
Is an AC charger the same thing as EVSE?
Yes. EVSE, electric vehicle supply equipment, is the technical term used in standards and manuals for exactly this unit, whether it is a wallbox, a portable cable or a public AC post.
Related Reading
- Are EV Chargers AC or DC?
- How Do Home EV Chargers Work?
- Level 1 vs Level 2 vs DC Fast Charging: A Practical Comparison
- IP Ratings for EV Chargers: IP54, IP65 and IP66 Compared
