OCPP Protocol Explained: Why Open Standards Matter for EV Charging

If you're researching EV chargers for your building, you may have come across the acronym OCPP without a clear explanation of what it means. OCPP stands for Open Charge Point Protocol — the communication standard that governs how EV charging stations talk to software management platforms. Think of it like the language chargers use to send and receive data: when a resident starts a charging session, a payment is processed, or a remote diagnostic runs, OCPP is the protocol making that happen.

For HOA boards and property managers, OCPP matters in one critical, practical way: it determines whether you can switch software vendors without replacing your entire hardware investment. Chargers that support OCPP are vendor-neutral, meaning you can connect them to any OCPP-compatible management platform. Chargers that use proprietary protocols lock you into a single vendor's ecosystem for the lifetime of the equipment.

Understanding this distinction before you sign a contract can save your community tens of thousands of dollars down the road.

OCPP has gone through several versions since it was first developed by the Open Charge Alliance, a nonprofit that oversees the standard. The two versions you'll encounter most often when evaluating hardware today are OCPP 1.6 and OCPP 2.0.1.

OCPP 1.6 is the most widely deployed version globally. It supports the core features most residential and commercial installations need: remote start and stop, real-time energy monitoring, access control through RFID cards or mobile apps, and basic fault reporting. If a vendor says their chargers are "OCPP-certified," they almost certainly mean OCPP 1.6.

OCPP 2.0.1 is the newer and more capable version, released by the Open Charge Alliance in 2020. It adds features including enhanced security, smart charging profiles, and better support for complex multi-site deployments. OCPP 2.0.1 also includes built-in support for device management and more detailed metering data — useful for buildings that need to bill residents individually or participate in utility demand response programs. When evaluating vendors, ask specifically which version they support and whether a firmware update can move existing hardware from 1.6 to 2.0.1.

Not all EV charger manufacturers support OCPP. Some major brands use proprietary communication protocols that only work with their own network management software. This arrangement can seem harmless when you first sign a contract — the vendor's platform may be perfectly adequate for your needs at the time. The problem surfaces later.

Imagine your building installs 20 Level 2 chargers from a vendor using a proprietary protocol. Three years later, the vendor raises their monthly network fees by 60%, or they are acquired by another company that discontinues support for the platform you depend on. Because the hardware speaks only the vendor's proprietary language, you have two options: absorb the cost increase, or rip out and replace the hardware.

This is not a hypothetical scenario. It has happened to dozens of multifamily properties that adopted early networked charging products before the OCPP standard became widely enforced. Some communities ended up with chargers that functioned as simple, unnetworked outlets because the vendor shut down — stranding all the monitoring, billing, and access control features they had paid for.

Asking a vendor whether their equipment is OCPP-compatible is a start, but it's not enough. Vendors sometimes describe their equipment as "OCPP-based" while still requiring proprietary extensions or a certified platform from their own catalog. Here are the steps to verify true interoperability:

If a vendor is evasive on any of these points, treat that as a signal that the openness of their protocol is more marketing than reality.

Beyond the vendor lock-in issue, OCPP has direct implications for two areas HOA boards often underestimate: resident billing and utility demand response programs.

For resident billing, OCPP 1.6 and 2.0.1 both support session-based metering, meaning the charger records exactly how much electricity each session consumed and reports it to the management platform. This data is what allows a software platform to generate itemized bills for individual residents — a critical capability in buildings where residents pay their own charging costs rather than having it bundled into HOA fees.

For utility programs, OCPP 2.0.1's smart charging profiles are particularly valuable. Several utilities now offer demand response programs specifically for multifamily EV charging — essentially paying building owners to temporarily reduce charging speeds during peak grid demand periods. These programs rely on the ability to send standardized charging commands to the hardware remotely. OCPP 2.0.1 supports these commands natively, while older or proprietary protocols may not, leaving your building ineligible for programs that can generate meaningful utility bill savings or direct payments.

You don't need to become a protocol expert to make a good decision here. You need to ask three questions when evaluating any EV charger proposal:

A reputable installer working with quality hardware will answer yes to all three without hesitation. Any reluctance should prompt you to ask follow-up questions before signing. The EV charging market is still maturing, and the vendors who bet on proprietary lock-in are betting against your community's long-term interests. Open standards like OCPP are how you protect the investment your building is making today — and keep your options open as technology continues to improve.