EVSE stands for electric vehicle supply equipment. It is the term electricians, inspectors and the electrical code use for what everyone else calls an EV charger, and the difference in names is more than jargon. For home Level 1 and Level 2 charging, the box on your wall does not actually charge the battery. Knowing what it does do makes it easier to buy the right one, read a quote, and understand what the inspector is checking.
The definition
The Department of Energy's handbook for charging station hosts defines EVSE as the equipment used to deliver electrical energy from an electricity source to a plug-in vehicle, and adds that EVSE communicates with the vehicle to ensure that an appropriate and safe flow of electricity is supplied (AFDC, Plug-In Electric Vehicle Handbook for Public Charging Station Hosts). The same handbook explains the key distinction: Level 1 and Level 2 EVSE provide alternating current (AC) to the vehicle, and the vehicle's onboard charger converts it to the direct current (DC) the battery needs. DC fast chargers are different: they deliver DC directly.
So at home, the "charger" in the strict sense is inside the car. The AFDC describes the onboard charger as the part that takes incoming AC through the charge port and converts it to DC for the traction battery (AFDC, how all-electric cars work). That is why your car, not your wall unit, sets the ceiling on home charging speed.
What the EVSE actually does
- Tells the car how much current it may draw. The EVSE advertises its available current and the car stays within it. Tesla's Mobile Connector, for example, detects which wall adapter is attached and sets its current draw to match (Tesla Mobile Connector manual).
- Supplies power only when the car is ready. This is the communication the DOE handbook describes: the EVSE and the car exchange signals so the flow of electricity is appropriate and safe, rather than the connector sitting live on the wall.
- Protects people from shock. Home EVSE commonly includes ground-fault protection; the relevant standard is UL 2231, personnel protection for EV supply circuits (UL 2231-1). Wallbox's Pulsar Plus datasheet lists an integrated 20 mA charge current interruption device plus ground monitoring, per UL 2231 (Wallbox datasheet).
- Adds smart features, if you want them. Wi-Fi scheduling, energy reporting and load sharing between units live in the EVSE. Tesla's Wall Connectors can share power across up to six units (Tesla power sharing).
The parts, from wall to car
| Part | What it is | What to check |
|---|---|---|
| Supply connection | Hardwired terminals, or a plug for a 240 V receptacle such as a NEMA 14-50 | Matches your circuit; copper-only terminals on some units |
| Control box | Electronics, relay or contactor, ground-fault protection | Listing to UL 2594; enclosure rating for the location |
| Cable | The flexible lead to the car: 20 feet on Tesla's Mobile Connector, 25 feet on the Pulsar Plus | Long enough to reach the port without stretching |
| Connector (handle) | J1772 or NACS (SAE J3400) | Matches your car's AC port |
| Holster and cable hook | Where the handle and cable rest | Keeps the handle off the floor and out of the rain |
UL 2594 is the standard for electric vehicle supply equipment (UL 2594). A listed unit has been tested to it; a no-name unit sold online without a listing mark is a question your inspector may ask.
Three forms of home EVSE
Portable cord sets
The cable that came with many cars is EVSE too, just a portable one. Tesla's Gen 2 Mobile Connector is an example: a 20-foot cable, a control box and interchangeable plugs for 120 and 240 volt outlets, drawing 32 A on a 14-50 (Tesla Mobile Connector manual).
Wall-mounted units
The common home install: a fixed box, hardwired or plugged into a 240-volt outlet. See hardwired vs plug-in for how they differ.
Pedestal units
The same electronics on a post, for a driveway or a detached carport. See driveway, carport and pedestal installs.
Enclosure ratings, in Florida terms
The enclosure rating tells you what the box is built to withstand. Tesla's Wall Connector is rated Type 3R / IP54 (Tesla specifications); the Wallbox Pulsar Plus and Grizzl-E Classic list NEMA Type 4 (Wallbox; Grizzl-E Classic). Type 4X adds corrosion resistance to Type 4 (NEMA), which is worth knowing about near salt water, though the popular home units above do not advertise it. Check the operating temperature too: the Pulsar Plus is rated to 104 F, and a west-facing wall in Homestead in August can challenge that. Our outdoor charger guide covers placement.
A buying checklist for EVSE
- Listing mark. UL 2594 or an equivalent listing from a recognized testing lab, visible on the unit and the box.
- Connector. Matches your car's AC charge port.
- Maximum output and adjustability. Can the installer set it to match your breaker? Most wall units can.
- Connection type. Hardwired, plug-in, or both.
- Enclosure and temperature range. Suitable for where it will hang.
- Cable length. Measure from the mounting spot to the charge port with the car parked normally.
- Smart features you will actually use. Scheduling for off-peak rates, load sharing for a second car.
Our best home EV chargers roundup compares specific models against this list.
How the code treats EVSE
In the 2020 NEC, which Florida adopts through its 8th Edition building code (Florida Building Commission), Article 625 covers EV charging equipment. A few rules touch every home install:
- Each EVSE outlet gets its own branch circuit (625.40; Leviton code reference).
- The breaker is sized for continuous duty at 125% of the EVSE's maximum load (625.41; Mike Holt summary).
- No mechanical ventilation is needed indoors when the EVSE is listed for charging without it (625.52; Mike Holt summary).
- Bidirectional equipment that exports power must be listed and marked for that use (625.48; NEC 625.48 text). See EVs as backup power.
More terms are defined in our EV charging glossary.
Questions homeowners ask
Is EVSE the same as a charging station?
Yes, in everyday use. The DOE handbook notes EVSE units are commonly called charging stations.
Why does my 48 A wall unit charge at 32 A?
Either the EVSE was set to 32 A to match a 40 A breaker, or your car's onboard charger accepts no more than that. Both are normal.
Do I need EVSE for Level 1?
Yes, but it is usually the portable cord set that came with the car, plugged into a standard outlet in good condition, ideally one not shared with other large loads.
Can any electrician install EVSE?
Florida requires electrical contracting to be done by licensed electrical contractors, with a narrow owner-builder exemption for your own home (F.S. 489.503). Check a contractor's license at MyFloridaLicense, and see DIY EV charger installation in Florida.
Choosing and installing yours
KRW Electric (EC13012832) installs listed EVSE of every major type across Miami-Dade, Broward and Palm Beach, with the permit and inspection handled. See EV charger installation and Level 2 charger installation, browse the Florida Home EV Charging Guide, or ask us about your car and your garage.
Reviewed by Kyle White, KRW Electric Company LLC — licensed electrical contractor EC13012832.
