What Is IEC 61851?
IEC 61851 is the international standard published by the International Electrotechnical Commission that defines the requirements for conductive charging systems for electric vehicles (EVs). It covers the characteristics, connection, safety, communication, protection, marking and testing of EV supply equipment (EVSE) that delivers AC or DC power to electric road vehicles and industrial trucks. The standard is organised into several parts, with IEC 61851-1 specifying general requirements and IEC 61851-23 covering DC charging equipment with rated voltages up to 1,000 V AC or 1,500 V DC.
The standard defines four charging modes — Mode 1 through Mode 4 — which classify how an EV connects to the supply network and what level of safety and communication is required. Mode 3, for example, uses a dedicated EVSE with control pilot signalling between the charger and the vehicle, while Mode 4 covers DC fast charging. Charging stations built to IEC 61851 must handle control-pilot signalling, protective earth monitoring, residual current detection and, in networked installations, back-end communication for authentication, billing and load management.
Why Industrial Computers Matter in EV Charging Infrastructure
An EV charging station is, at its core, an embedded computing system. The controller inside a charging pillar or wallbox must run the charging state machine, read control-pilot and proximity-pilot signals, monitor earth leakage and over-current conditions, drive the display and RFID reader, and communicate with the vehicle, the grid and a cloud back-end — often 24 hours a day, in outdoor cabinets exposed to dust, vibration, humidity and wide temperature swings.
This is why industrial-grade fanless computers are widely used as the control and communication unit in EVSE. Key requirements typically include:
| Requirement | Typical Specification |
|---|---|
| Processor | Intel® Core™ i3 / Celeron, 6–10 cores |
| Memory | 8–16 GB DDR4 |
| Storage | 256 GB – 1 TB SSD |
| Serial ports | Multiple RS-232/RS-485 (DB9) for meters and controllers |
| Networking | Dual Gigabit Ethernet for grid + back-end separation |
| Operating temperature | Extended range, fanless passive cooling |
| Power input | 12 V or 24 V DC from the charger's supply |
| OS support | Windows 11 IoT, Linux, or a locked-down embedded image |
Serial connectivity is particularly important: energy meters, RFID modules, surge-protection monitors and legacy charge controllers frequently communicate over RS-485 or RS-232, so industrial PCs with multiple DB9 ports simplify integration and reduce the number of external converters.
Applications in Charging and Energy Systems
Beyond EVSE controllers, the same class of rugged computer is used across adjacent energy and infrastructure roles:
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AC and DC charging station controllers — running the IEC 61851 charging state machine and OCPP back-end client.
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Load management gateways — aggregating multiple chargers and communicating with the site's energy management system.
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Protocol gateways — bridging OCPP, Modbus TCP/RTU and proprietary charger protocols.
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Kiosks and payment terminals — driving touch displays, card readers and receipt printers.
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Solar and battery-storage controllers — monitoring inverters, BMS units and energy meters.
Because these systems are often installed in unattended locations, reliability and long-term OS support matter more than raw benchmark performance. A fanless design with no moving parts avoids the dust ingress and fan failure that shorten the life of commercial desktop hardware in outdoor cabinets.
Choosing the Right Controller Hardware
When specifying a computer for an IEC 61851 charging installation, match the processor to the workload: a 6-core Intel® Core™ i3 is ample for a single- or dual-outlet AC charger running OCPP, while DC fast-charging cabinets and multi-charger gateways benefit from higher core counts and more RAM for concurrent protocol handling. Confirm that the unit offers the serial ports, Ethernet ports and DC input voltage your design requires, and choose an operating system image — Windows 11 IoT, Windows 11 Pro, Linux or a custom embedded build — that fits your remote-update and security strategy.
Thinvent Products for EV Charging and Industrial Control
Thinvent manufactures fanless industrial computers, mini PCs, thin clients and all-in-one PCs designed for exactly these environments. The Thinvent® Industrial PC IPC3, built on the Intel® Core™ i3-1215U processor (6 cores, up to 4.4 GHz, 10 MB cache) with 16 GB DDR4 RAM and 1 TB SSD, is well suited to charging-station control, protocol gateway and energy-monitoring roles. It is available with options including Quad DB9 serial ports for meters and controllers, and a choice of Windows 11 Professional, Windows 11 IoT Value, DOS or Thinux™ Embedded Linux, so integrators can deploy the same hardware platform across a fleet with different software stacks.
