Quick Answer
OCPP 1.6 is still a practical option for many existing EV charging networks, especially when operators need stable charger connectivity and broad hardware compatibility. OCPP 2.0.1 is better suited for new charging networks that require stronger security, improved device management, more advanced smart charging and better long-term scalability. OCPP 2.1 is designed for future-ready deployments involving ISO 15118-20, bidirectional charging, distributed energy resource integration and more advanced energy management use cases. The Open Charge Alliance states that OCPP 2.0.1 adds device management, improved transaction handling, enhanced security, smart charging, ISO 15118 support and display/message functions compared with OCPP 1.6.
For CPOs, charger manufacturers, system integrators and fleet charging operators, the most important question is not simply “Which OCPP version is newest?” The better question is:
Which OCPP version is right for your chargers, backend platform, security requirements, testing budget and future business model?
A modern OCPP EV charging management system should help operators manage mixed charger networks, support multi-version OCPP integration and reduce the risk of migration from older chargers to newer software platforms.
What Is OCPP and Why Does It Matter for EV Charging Software?
OCPP, or Open Charge Point Protocol, is the communication standard that allows EV charging stations to connect with backend charging management systems. In daily operations, it enables key functions such as user authorization, charging session control, remote monitoring, metering, diagnostics, firmware updates, load management and smart charging.
For a CPO, OCPP is not just a technical specification. It directly affects hardware procurement, software selection, charger interoperability and long-term operational flexibility. A charger that cannot communicate properly with the backend platform may create issues in billing, monitoring, uptime, maintenance and customer experience.
This is why OCPP compatibility should be a key requirement when selecting an EV charging software platform or charging point management system. However, “OCPP-supported” is not specific enough. Operators should ask:
- Which OCPP versions are supported?
- Which charger brands and models have been tested?
- Does the platform support both legacy and new chargers?
- Can the backend manage OCPP 1.6 and OCPP 2.0.1 chargers in the same system?
- Is there a roadmap for OCPP 2.1 charging software?
- What testing and integration support is available before rollout?
For operators still evaluating the role of backend software, a broader guide such as CPMS Complete Guide can help clarify how charging point management systems support daily CPO operations.
OCPP 1.6, OCPP 2.0.1 and OCPP 2.1: Key Differences
OCPP 1.6: Mature, Widely Used and Still Valuable
OCPP 1.6 remains one of the most widely deployed versions in the EV charging industry. It is commonly used by AC chargers, DC chargers, destination charging sites, workplace charging networks and many existing public charging operations.
Its main advantage is ecosystem maturity. Many charger manufacturers and backend providers already support OCPP 1.6, which makes it easier for operators to connect chargers from different brands. For CPOs with existing charger fleets, OCPP 1.6 can still provide reliable support for common use cases such as session management, meter values, remote start/stop, status notifications and basic smart charging.
The key point is this: OCPP 1.6 is not automatically outdated. It may still be the most practical choice when chargers are already deployed, stable and commercially productive.
However, OCPP 1.6 has limitations when compared with newer versions. It offers less advanced device management, fewer built-in security capabilities and a less flexible structure for complex smart charging or future energy integration. Operators that need stronger cybersecurity, better diagnostics or more advanced charger configuration should evaluate whether OCPP 2.0.1 EV charging software is a better long-term fit.
OCPP 2.0.1: Better for Modern CPO Software Platforms
OCPP 2.0.1 was designed to address many limitations of OCPP 1.6. According to the Open Charge Alliance, OCPP 2.0.1 adds improved device management, better transaction handling, stronger security, enhanced smart charging functions, ISO 15118 support and display/message support.
For CPOs, the value of OCPP 2.0.1 is not only technical. It can improve how operators manage chargers at scale. Better device management means the backend can monitor and configure charging stations more effectively. Stronger security helps operators prepare for more demanding network and data protection requirements. Improved smart charging helps support load balancing, energy optimization and fleet charging scenarios.
This makes OCPP 2.0.1 a strong option for:
- New public charging networks
- Fleet depot charging
- Commercial parking charging
- Highway charging corridors
- Networks requiring stronger charger diagnostics
- Operators planning future ISO 15118-related use cases
However, migration requires planning. OCPP 1.6 and OCPP 2.0.1 are not directly compatible, and the Open Charge Alliance notes that OCPP 2.0.1 is not backward compatible with OCPP 1.6. This means operators may need charger firmware upgrades, backend configuration work, lab testing, field validation and staged rollout plans.
OCPP 2.1: Future-Ready but Not Automatically Required
OCPP 2.1 is the newest generation and is designed for more advanced charging and energy use cases. The Open Charge Alliance announced OCPP 2.1 with support for ISO 15118-20, bidirectional power transfer, V2X energy flows, distributed energy resource control and improved smart charging.
For operators preparing for bidirectional charging, vehicle-to-grid, vehicle-to-building, advanced fleet energy management or grid-interactive charging infrastructure, OCPP 2.1 charging software is highly relevant. It is especially important for long-term infrastructure planning where chargers are expected to interact more closely with energy systems, buildings, batteries, solar assets or local energy management platforms.
But OCPP 2.1 should not be treated as a mandatory requirement for every deployment. Operators should first verify charger support, backend readiness, certification availability and real business use cases. In many markets, OCPP 1.6 and OCPP 2.0.1 will continue to coexist for years.
For fast-growing regional networks, especially in markets with mixed charger brands and different grid conditions, operators may benefit from reading Southeast Asia EV Charging Management System to understand how local deployment conditions affect software selection.
OCPP 1.6 vs OCPP 2.0.1 vs OCPP 2.1 Comparison
| OCPP Version | Best-Fit Scenario | Security Capability | Smart Charging Capability | Device Management | Deployment Difficulty | Recommended For |
|---|---|---|---|---|---|---|
| OCPP 1.6 | Existing charger networks, legacy hardware, mixed-brand deployments | Basic by default; security can be improved depending on implementation | Supports basic smart charging and load balancing | Limited compared with OCPP 2.x | Low to medium | CPOs with existing chargers that need stable connectivity and broad compatibility |
| OCPP 2.0.1 | New networks requiring stronger control, security and scalability | Stronger security architecture than OCPP 1.6 | More advanced smart charging and energy control | Significantly improved device monitoring and configuration | Medium to high | CPOs building modern charging networks, fleet operators and system integrators |
| OCPP 2.1 | Future-ready networks involving V2X, DER, ISO 15118-20 or advanced energy management | Builds on the OCPP 2.x security foundation | More advanced smart charging and bidirectional energy support | Advanced and extensible | High | Operators planning next-generation infrastructure and energy-integrated charging models |
Which OCPP Version Should CPOs Choose?
Choose OCPP 1.6 If Compatibility Is Your Priority
OCPP 1.6 is often the right choice when your main priority is connecting existing chargers reliably. If your chargers are already deployed, your uptime is stable and your business model does not require advanced smart charging or bidirectional energy flows, OCPP 1.6 may continue to be cost-effective.
CPOs should not replace or upgrade working chargers only because a newer protocol exists. Instead, they should evaluate whether the current setup limits operational goals. If the backend can monitor chargers, process transactions, support billing and provide basic troubleshooting, a full migration may not be urgent.
Choose OCPP 2.0.1 If You Are Building or Upgrading a Modern Network
OCPP 2.0.1 is usually the better choice for new networks or major platform upgrades. It is more suitable for CPOs that need stronger security, richer data, better diagnostics, improved transaction handling and more scalable smart charging.
When comparing OCPP 1.6 vs 2.0.1, the decision should be based on operating requirements rather than version numbers. OCPP 2.0.1 can provide more control, but only when the charger firmware, backend platform and testing process are ready.
A CPO planning a new platform should ask vendors whether their OCPP EV charging management system supports OCPP 2.0.1 in real deployments, not just in documentation.
Choose OCPP 2.1 If You Have a Clear Future Energy Strategy
OCPP 2.1 is best for operators that are planning advanced energy use cases. This may include vehicle-to-grid, bidirectional charging, solar-plus-charging, battery storage integration, fleet energy optimization or more dynamic transaction models.
For many CPOs, the practical approach is to choose a platform that supports OCPP 1.6 and OCPP 2.0.1 today, while preparing for OCPP 2.1 tomorrow. This avoids unnecessary migration pressure while keeping the network future-ready.
Migration Risks: What CPOs Should Check Before Upgrading
Charger Firmware Compatibility
The biggest risk in OCPP migration is often charger firmware. A charger may advertise OCPP support, but its actual implementation may not support all required functions. Before upgrading, operators should confirm firmware version, supported OCPP profiles, remote update capability and rollback options.
Backend Compatibility
An OCPP-compatible CPMS should do more than connect chargers. It should support charger onboarding, diagnostics, firmware workflows, smart charging rules, billing data, payment integrations, roaming integrations and operational reporting.
For CPOs selecting a platform, EV Charging Point Management System is a useful internal link opportunity because it can explain how backend software supports daily charger operations.
Certification and Testing Scope
OCPP certification helps reduce interoperability risk, but operators should still check the scope of certification. The Open Charge Alliance certified products directory allows users to review certified products and filter by OCPP version and certificate type.
A product may be certified for one protocol version or functional scope, but that does not mean every advanced feature is supported. CPOs should ask for test reports, charger-brand compatibility records and pilot deployment evidence.
Operational Rollout Risk
Migration should be phased. Operators should avoid switching an entire network at once. A better approach is to test by charger model, site type, firmware version and business-critical workflow.
Before migration, CPOs should test:
- Charger registration and onboarding
- Remote start and stop
- Authorization and user access
- Meter value accuracy
- Billing data flow
- Firmware updates
- Diagnostics and error reporting
- Smart charging rules
- Security certificates
- Payment and mobile app integration
- Network disconnection and reconnection behavior
How TrendPower Supports Multi-Version OCPP Integration
Many operators do not need a platform that supports only one OCPP version. They need an EV charging software platform that can manage real-world networks where older and newer chargers operate together.
TrendPower supports CPOs by focusing on practical OCPP integration, charger compatibility and backend scalability. For existing networks, this means helping operators maintain stable OCPP 1.6 charger operations while preparing a gradual upgrade path. For new deployments, it means supporting discussions around OCPP 2.0.1 EV charging software, charger firmware readiness, smart charging requirements and testing scope.
For future-oriented operators, TrendPower can help plan a roadmap toward OCPP 2.1 charging software without forcing unnecessary upgrades before the hardware and business case are ready.
This approach is especially useful for CPOs, charger manufacturers and system integrators that need multi-version OCPP support, white-label business models or customized platform workflows. Operators that want to launch a branded charging service can also explore White Label EV Charging Software.
OCPP Software Procurement Checklist for CPOs
Before choosing an OCPP EV charging management system, CPOs should ask:
- Does the platform support OCPP 1.6, OCPP 2.0.1 and future OCPP 2.1 requirements?
- Can it manage multiple charger brands in one dashboard?
- Can OCPP 1.6 and OCPP 2.0.1 chargers operate in the same platform?
- Which charger models have already been tested?
- Does the platform support smart charging and load management?
- How are firmware updates managed?
- What security profiles and certificate workflows are supported?
- Can the platform integrate with payment systems, mobile apps and roaming platforms?
- What migration support is provided?
- How does the platform help reduce downtime, maintenance cost and support workload?
The right CPO software platform should not only support the latest protocol. It should help operators make the right version choice for each site, charger type and business model.
Final CTA
Need an OCPP-compatible EV charging software platform that supports today’s chargers and tomorrow’s upgrade path?
Request a TrendPower demo to discuss charger compatibility, OCPP 1.6 / OCPP 2.0.1 integration, and future-ready OCPP 2.1 planning for your charging network.
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FAQ
No. OCPP 1.6 is older, but it is still widely used and remains suitable for many existing charging networks. It is a good choice when chargers are already deployed and operating reliably. However, operators with stronger requirements for security, device management or advanced smart charging should evaluate OCPP 2.0.1.
No. OCPP 2.0.1 support depends on charger hardware, firmware and manufacturer implementation. Operators should not assume compatibility without testing. Even when a charger claims OCPP 2.0.1 support, real backend integration should be validated before deployment.
Yes. A well-designed EV charging software platform can support multiple OCPP versions, including OCPP 1.6 and OCPP 2.0.1. This is important for operators managing mixed networks with different charger brands and hardware generations.
CPOs should upgrade when there is a clear operational reason, such as stronger security, better diagnostics, improved smart charging or a new network deployment. If the existing OCPP 1.6 network is stable and meets current needs, a phased migration may be more practical than an immediate full upgrade.
Not always. OCPP 2.1 is valuable for future-ready deployments involving bidirectional charging, ISO 15118-20, DER control and advanced energy management. However, operators should confirm charger and backend readiness before making OCPP 2.1 mandatory.
Operators should test charger firmware, backend communication, user authorization, session control, metering, billing, firmware updates, diagnostics, smart charging, security certificates, payment flows and mobile app integration. Testing should begin with a pilot group before full network rollout.
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