Standards, interoperability and future-proofing your charging

A depot charging system is a long-term commitment — the hardware you install today will likely still be in your yard in ten years. That makes one question quietly crucial: when something changes — your software provider, a charger brand, your needs — can you adapt, or are you stuck? Standards are the answer. Getting them right at purchase is the cheapest insurance in the whole project, and this guide explains the few that matter.

OCPP: the one that matters most

The Open Charge Point Protocol (OCPP) is a common language that lets chargers from different manufacturers talk to different management software. Its value is simple: freedom. With fully OCPP-compliant chargers you can change your back-office software or add another brand of charger without ripping anything out. Without it, you can be trapped with one supplier’s hardware and software — and their pricing — for the life of the system. Make OCPP compliance a firm, written requirement, as the procurement guide recommends.

ISO 15118 and Plug & Charge

ISO 15118 is the standard behind “Plug & Charge” — a vehicle and charger recognising each other automatically when connected, so charging starts and bills correctly with no app or card. In a depot it means drivers simply plug in and the system knows the vehicle. It’s a smoother, more secure experience that’s becoming more common — a genuine nice-to-have rather than a day-one essential, but worth specifying where it’s available.

Connectors and where they’re heading

Physical connector standards matter for compatibility: Type 2 for AC and CCS for DC cover almost all UK vehicles today, with the Megawatt Charging System (MCS) emerging for the largest trucks. You mostly follow the vehicle here, but knowing the direction of travel stops you buying hardware that’s a dead end for the fleet you’ll run in five years.

Who owns your data

An often-missed point: your charging system generates valuable data — usage, costs, vehicle patterns — and you want to own it and be able to take it with you. Closed systems can hold your data hostage, making it painful to switch providers. Ask, in the contract, who owns the data and whether you can export it in a usable form. Data portability is part of interoperability, and part of not being locked in.

A future-proofing checklist

Pulling it together, protecting a decade-long investment comes down to a short list: insist on OCPP compliance; prefer non-proprietary, standards-based software; confirm data ownership and export; check connectors match where your fleet is heading; and read the contract for clean exit terms. None of this costs more to specify — it only costs if you skip it and have to unpick a closed system later.

The bottom line

Standards are how you keep control of a system that will outlast several software contracts and charger models. OCPP keeps hardware and software swappable, ISO 15118 smooths daily use, connector awareness avoids dead ends, and data ownership keeps you free to move. Specify them up front and future-you inherits options instead of a lock-in — the cheapest, highest-return diligence in the whole project.