EV Charging
Also known as: EV charger, electric vehicle charging, EVSE, wallbox, rapid charger
EV charging encompasses the equipment, infrastructure, and processes used to replenish the battery of an electric vehicle (EV).
Charging occurs at different speeds (AC Level 1, AC Level 2, and DC fast charging) depending on the power source and charging equipment. Home charging on a dedicated wallbox handles the majority of daily EV charging for most drivers; public charging networks cover longer journeys. Understanding charging speeds, connector types, and network coverage is essential for practical EV ownership and fleet management.
EV Charging, explained at three levels
At home
EV charging is simply plugging your electric car into an electricity source to refill its battery -- similar to charging a phone, but with a much larger battery. You can charge at home with a dedicated charger installed in your garage (which charges slowly but is convenient), or at public charging points (which can charge much faster). The fastest public chargers can add 100 miles of range in about 15 minutes; a slow home charger might add the same range overnight.
At work
EV charging for businesses involves two main considerations: charging infrastructure for employees (workplace charging) and fleet charging for company vehicles. Workplace charging requires electrical infrastructure upgrades (load management to avoid overloading building circuits), a mix of charging speeds (Level 2 is sufficient for all-day parked vehicles), and potentially a charging management system that monitors usage, allocates power fairly, and bills costs back to the appropriate employees or departments.
At home
EV charging speed is measured in kilowatts (kW) of power delivered to the vehicle. Level 1 AC charging (standard household socket) delivers 1.3-2.4kW -- adding 5-10 miles of range per hour. Level 2 AC charging (dedicated wallbox or public AC charger) delivers 7-22kW -- adding 20-60 miles per hour. DC fast charging delivers 50-350kW -- adding 100-200 miles in 20-30 minutes. The vehicle's onboard charger limits AC charging speed; DC fast charging bypasses the onboard charger and charges the battery directly.
At work
Connector types vary by region and charging level. In Europe, the standard household socket (Schuko or BS1363) is used for Level 1. Type 2 is the standard AC connector for home wallboxes and public AC chargers. CCS (Combined Charging System) Type 2 is the EU regulatory standard for DC fast charging, incorporating the AC Type 2 connector with additional DC pins. In North America, NACS (formerly Tesla connector) is gaining dominance. CHAdeMO is a competing DC standard used in many older Japanese vehicles.
At home
Smart charging (managed charging) is increasingly important as EV adoption grows. Unmanaged charging -- all EVs in a building plugging in simultaneously at maximum speed when drivers arrive -- can overload building electrical capacity and create costly peak demand charges. Smart charging systems manage charging schedules and speeds to: stay within the building's electrical capacity limit, avoid peak electricity tariff periods, prioritise vehicles that need to be ready first, and integrate with time-of-use electricity tariffs to charge when electricity is cheapest and greenest.
At work
From a practitioner standpoint, workplace EV charging infrastructure planning must consider: the current electrical capacity of the building (a significant upgrade may be required), the expected number of EVs to be charged simultaneously, the typical dwell time of parked vehicles (determining how much charging time is available and therefore what charging speed is needed), and the payment and billing model (free for all employees, subsidised, or cost recovery). Future-proofing by installing cabling and protective equipment for more chargers than are currently needed is often cost-effective -- adding chargers later without the infrastructure is expensive; adding them to pre-installed infrastructure is cheap.
Real-world examples
At home
Jerome switched to an electric car and installed a 7kW wallbox in his garage. His daily commute is 30 miles, which uses about 10kWh. He plugs in every evening and the car is fully charged by midnight, costing about 70p at his off-peak tariff. He uses public rapid chargers only for occasional longer journeys.
At work
A construction company replacing its car fleet with EVs needed to install charging at its depot. An electrical survey showed the building's existing supply could support only 8 simultaneous 7kW chargers. Rather than upgrading the electrical supply (expensive), they installed 20 charging points with a smart load management system that dynamically allocated the available 56kW across whichever vehicles were plugged in, prioritising those scheduled to leave first.
How it compares
| Feature | Level 1 (AC 2.4kW) | Level 2 (AC 7-22kW) | DC Fast Charging (50-350kW) |
|---|---|---|---|
| Power delivered | 1.3-2.4kW | 7-22kW (typical home: 7kW) | 50-350kW |
| Range added per hour | 5-10 miles | 20-60 miles | 100-200 miles in 20-30 min |
| Typical use case | Emergency overnight; occasional top-up | Home overnight charging; workplace all-day | En-route fast charge for long journeys |
| Equipment needed | Standard socket (with EV cable) | Dedicated wallbox or public AC charger | Public DC fast charging station |
| Cost (home, UK) | ~£4/100 miles (peak tariff) | ~£2.50/100 miles (off-peak) | ~£12-20/100 miles (public rapid) |
Level 1 is slow and uses standard sockets -- for emergency use only. Level 2 is the right speed for home and workplace charging where vehicles dwell for several hours. DC fast charging provides rapid top-ups on longer journeys but costs significantly more than home charging.
For analysts
In BA artefacts, EV charging requirements surface in fleet management systems, workplace facilities planning, and sustainability reporting. When documenting requirements for a fleet management system with EVs, include: vehicle charge state tracking (current battery percentage and range), charging schedule management (which vehicles need to be charged by when), public charging network integration (locating available chargers on route), and cost tracking (splitting public vs. home vs. workplace charging costs). For facilities management, document the building's electrical capacity constraint as a hard limit on simultaneous charging load, and specify the smart charging management system's capability to operate within that constraint.
History & origin
Electric vehicle charging infrastructure began developing in earnest with the first wave of commercial EVs in the early 2010s (Nissan Leaf 2010, Chevrolet Volt 2010). CHAdeMO (Japan, 2010) and CCS (Combined Charging System, Europe/US, 2012) emerged as competing DC fast charging standards; Tesla created its proprietary Supercharger network in 2012. The lack of a unified standard was a significant consumer friction point. From 2023, major automakers (Ford, GM, Rivian, and others) announced adoption of Tesla's NACS (North American Charging Standard) connector, beginning a consolidation toward a unified standard in North America. In Europe, CCS Type 2 is the regulatory standard for DC fast charging.