Why do EVSE, device and connector counts differ?

EVSE means electric vehicle supply equipment: the part of a charging device that controls a session for one vehicle. A device is the physical unit; a connector is its plug or socket [S1]. Counting each gives different totals. Check the unit, reporting date and public-access scope before assessing charging around your business. Checked October 2026.

Last checked 18 October 2026

What is the difference between EVSE, a device and a connector?

Use the Department for Transport (DfT) definitions when reading its public charging tables. An electric vehicle (EV) can encounter several pieces of equipment at the same site:

A device can contain multiple EVSEs. An EVSE can offer alternative connectors that cannot be used together [S1]. Use the commercial charging guide to plan what your site needs.

Why can several plugs serve fewer vehicles?

Assume a hypothetical car park has a single cabinet with two EVSEs. Each EVSE offers two alternative connectors, but can supply only a single car at once.

The illustrative inventory is therefore one location, one device, two EVSEs and four connectors. It supports two sessions together under these assumed operating conditions. Counting the plugs would double that session count. This example applies DfT’s distinction; it is not a specification for a particular product [S1].

For a proposal at your site, request a diagram showing the cabinet, each EVSE, its connectors and the bays served. Ask the designer to demonstrate simultaneous operation before describing the installation’s capacity to customers.

Why did DfT’s headline counting unit change?

DfT made EVSE its primary metric in 2026. Its January release records 116,052 EV chargers and 87,796 devices on the same reporting date. These are alternative descriptions of the infrastructure, not separate quantities to add together [S2].

Read the table label before comparing periods. A move from devices to EVSE can change the apparent total without representing that many newly installed units. Keep the counting unit constant or show both series separately. Use regional charging data as a starting point, with its metric and date visible.

Does the count show how much charging your customers can use?

It does not establish delivered power or unrestricted access. Public charging guidance distinguishes physical equipment from the vehicle-level units inside it [S4]. Ask separately about shared power, accessible bays, opening times and out-of-service equipment.

DfT’s methodology describes a snapshot at the start of the reporting period. It excludes non-public domestic and workplace equipment and assigns locations to administrative areas [S3]. Your practical catchment may cross those boundaries. Record which area and access conditions you used before drawing a conclusion.

Pair the counts with public versus private charging, charger utilisation and the charging cost tool. A local inventory is an input to your assessment, not an income forecast.

What should you do next?

Visit the attract customers and staff hub and site check, then get matched with an installer that covers your area.

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