OCPP Reservation: How Reserving a Charger Actually Works
The ReserveNow and CancelReservation flow, how chargers handle the user-facing reservation experience, and the operational subtleties.
EV Charging Industry Blogs
Stay informed with the latest trends, insights, and developments in the electric vehicle charging industry.
OCPP LocalAuthList: Offline Charger Operation
How LocalAuthList lets a charger authorize users when the back-end is unreachable. The patterns that work and the trade-offs that come with them.
OCPP-J Example Messages: Ready-to-Use JSON Samples
Copy-paste OCPP-J JSON examples for BootNotification, Heartbeat, StatusNotification, StartTransaction, MeterValues and more, with the wire frame explained.
OCPP Firmware Updates: Pushing Software to Chargers Safely
How OCPP handles firmware updates: the messages, the lifecycle, the security, and the operational reality of pushing updates to chargers in production.
Debugging a BootNotification Rejection: A Live OCPP Walkthrough
See exactly why a charge point gets a Rejected or Pending BootNotification: reproduce it live in a browser, read the frames, and fix each cause.
The OCPP 2.0.1 Device Model: Why It Matters
OCPP 2.0.1's device model is a richer way to represent what a charger is and what it can do. How it works and why it improves on 1.6.
Connect a Virtual Charge Point to Your CSMS (wss://)
Walk the OCPP boot handshake, station id, and subprotocol, then connect a virtual charge point to your CSMS live over wss://, in the browser, no hardware.
OCPP 2.0.1 TransactionEvent: The Unified Session Message
TransactionEvent replaces 1.6's StartTransaction, MeterValues, and StopTransaction with one unified message. How it works and why the change matters.
OCPP Heartbeat and the Connection Lifecycle Explained
How Heartbeat keeps an OCPP connection alive, what happens when it fails, and the connection-recovery patterns that make production deployments robust.
OCPP RemoteStart and RemoteStop: How App-Initiated Sessions Work
When a user starts charging via their phone app, the back-end sends RemoteStart to the charger. Here is how the message works and where it goes wrong.
Common OCPP Errors and What They Mean
A practical guide to the OCPP errors you actually see in production: what each one means, what causes it, and how to fix it.
OCPP MeterValues: What Gets Reported and How Often
MeterValues carries the energy data that drives billing and analytics. What it contains, how often it should fire, and where it goes wrong in production.
OCPP Smart Charging Explained: ChargingProfiles in Practice
How OCPP smart charging works: profiles, schedules, stacking, and the operational realities of controlling charger power output via OCPP.
OCPP Security Profiles: What Each One Means
OCPP defines three security profiles ranging from basic to mutually-authenticated TLS. What each profile actually requires and which to use in production.
How to Test an OCPP Charge Point Without Any Hardware
A practical guide to testing and simulating an OCPP charge point in software, with no charger and no lab. Build a real integration test suite for your CSMS.
OCPP StatusNotification: The Charger State Machine
StatusNotification carries every connector state change. The state machine, the transitions that matter, and what operational dashboards depend on.
Free OCPP Simulators & Charge Point Emulators (2026 Guide)
An honest, verified rundown of free OCPP simulators and charge-point emulators: SteVe, CitrineOS, EVerest, MicroOcpp, and which one fits your test.
OCPP StartTransaction and StopTransaction Explained
The two messages that bracket every charging session in OCPP 1.6, how they relate to billing, and how 2.0.1's unified TransactionEvent changes the model.
EV Charging for Hotels and Hospitality
Why hotels increasingly offer EV charging, how to design it as an amenity, and the patterns that distinguish good from bad implementations.
OCPI Tariff Dimensions: ENERGY, TIME, FLAT & PARKING_TIME
The four OCPI tariff dimensions in depth: ENERGY, TIME, FLAT and PARKING_TIME, how step_size rounding works, and how restrictions gate each one.
OCPP Simulator: Test and Debug OCPP Messages Online (Free)
A free online OCPP simulator to watch charging-station and CSMS messages flow frame by frame: BootNotification, Authorize, TransactionEvent, and more.
OCPP Message Flow: A Full Charging Session, Step by Step
The full OCPP message flow for a charging session, in order: boot, status, authorize, transaction start, MeterValues, stop. Plus a live simulator to replay it.
Major EV Charging Networks Compared (2026)
How the major EV charging networks in North America and Europe actually differ, and how to check coverage, pricing, and reliability yourself.
What Is a CSMS? Charging Station Management System Explained
The CSMS is the back-end that operates a fleet of EV chargers. Here is what it does, how it fits in the stack, and how to choose one.
The Economics of OCPI Roaming: Who Pays Whom
How money actually flows in OCPI roaming: the fees, the settlements, and how to think about the economics of cross-network charging.
OCPI Testing Tools and Strategies: A Practical Guide
How to test an OCPI implementation properly: mocks, schema validation, partner-style fixtures, and the operational tests that catch real bugs.
OCPI Sandbox: Try the Full API Flow Without a Partner
Run a complete OCPI 2.2.1 flow in a sandbox: credentials handshake, Locations, Sessions, Commands and CDRs, with no roaming partner needed.
OCPI Request Examples: Locations, Sessions & CDR JSON
Copy-paste OCPI 2.2.1 request examples: real Locations, Sessions, and CDR JSON payloads, with the HTTP method, endpoint path, and headers for each.
How to Test an OCPI Connection Before You Go Live
A step-by-step OCPI integration test workflow: handshake, versions, module smoke tests, and error handling, so nothing surprises you on go-live day.
EV Road Trip Planning: A Practical Guide
How to plan a long EV trip: tools, charger selection, time budgeting, contingencies, and the small details that make the difference.
Will My EV Charge at That Station? Connector Checker
Standing at a charger wondering if your plug fits? Three things decide it: connector, power level, and authorization. Includes a free checker tool.
EV Charging Time Calculator: How Fast Will You Charge?
Work out EV charging time from battery size, charger kW, and your start and end SOC, plus the DC taper that flat division misses. Free tool inside.
OCPP BootNotification Message: Fields, Statuses & Fixes
The OCPP BootNotification message explained: every field in 1.6 and 2.0.1, what Accepted/Pending/Rejected mean, and the failure modes that cause outages.
OCPI Integration Common Mistakes and Pitfalls: 11 to Avoid
Common OCPI integration mistakes and pitfalls (pagination, idempotency, timestamps, status codes) and the concrete fix for each, from real builds.
How Long Does It Take to Charge an EV? Times by Charger Level
How long it takes to charge an EV, from Level 1 to 350 kW DC fast: real charging times, the one formula that predicts any session, and the taper trap.
OCPI Security and Authentication: Tokens, TLS & mTLS
How OCPI security and authentication really work: bearer tokens, TLS, mTLS, the threat model, and a checklist to keep tokens from leaking.
OCPP 1.6 vs 2.0.1 Version Comparison (and 2.1): Which to Choose
OCPP 1.6 vs 2.0.1 vs 2.1 compared: transaction model, security, device model, and V2G, plus which version to pick for a new deployment and how to migrate.
OCPI 3.0 Preview: V2G, Grid Services, and Migration Planning
What OCPI 3.0 is positioned to change: bidirectional sessions, CDRs, tariffs, and grid services, plus how to prepare while running 2.2.1 today.
OCPI 2.3.0 Features: Payments, AFIR Pricing and Parking
The features OCPI 2.3.0 adds: the Payments module, AFIR-ready pricing, the Parking object, North American tax support, and who should upgrade.
OCPI 2.2 vs 2.2.1 Differences: Every Change and When to Upgrade
OCPI 2.2 vs 2.2.1 differences explained: the exact fields and enums 2.2.1 changed, what stayed the same, and whether you need to migrate.
OCPI HubClientInfo Module: How Hub Discovery Works
How the OCPI HubClientInfo module lets a hub publish its connected parties, with worked PUT/GET examples, the four status values, and the gotchas that bite.
What Is an EV Charging Roaming Hub? How It Works + Costs
What an EV charging roaming hub is, how it solves the N-by-N problem, how hub pricing is structured, and when direct peer-to-peer wins instead.
EV Charging Connectors: CCS, NACS, CHAdeMO & Type 2 Compared
CCS, NACS, CHAdeMO, Type 2, J1772: the 6 EV charging connectors, where each is used in North America and Europe, and which one your EV needs.
OCPI 2.1.1 to 2.2 Migration: The Step-by-Step Order
OCPI 2.1.1 to 2.2 migration in the order to actually do it: what changed, the Credentials handshake to fix first, and how to upgrade without breaking partners.
OCPI ChargingProfiles: Smart Charging via Roaming Explained
How OCPI ChargingProfiles lets an eMSP shape power on a live session: the fields, a full worked round trip, and the gotchas that quietly break it.
OCPI Hub vs Peer-to-Peer: How to Choose
When to roam through a hub, when to build direct peer-to-peer integrations, and what the tradeoffs cost you in practice.
OCPI Credentials and Versions Modules: How Partners Find Each Other
Before any data can flow between an eMSP and a CPO via OCPI, they have to negotiate. The Credentials and Versions modules are the handshake.
OCPI Commands Module: Remote Charging Control Across Networks
How eMSPs trigger start/stop/reserve actions on CPO stations via OCPI. The Commands module is what makes "Start Session" buttons in apps work.
OCPI Tariffs Module Explained: Fields, JSON, Examples
How the OCPI Tariffs module models EV charging prices: per-kWh, per-minute, time-of-use and idle fees, with annotated JSON and step_size gotchas.
OCPI Locations Module Explained: Data Model & Push Updates
The OCPI Locations module explained: the Location/EVSE/Connector data model, push updates, evse_id format, and the gotchas that get objects rejected.
OCPI Tokens Module: Authentication Without Sharing Customer Data
How eMSPs grant customers access to CPO stations via tokens, and how CPOs validate those tokens without ever seeing the underlying customer.
What Is OCPP? The Open Charge Point Protocol Explained
OCPP is how a charging station talks to its back-end. What it is, the messages it carries, how a session flows, and how 1.6, 2.0.1 and 2.1 differ.
OCPI CDRs Module: How Billing Records Flow Between Networks
CDRs (Charge Detail Records) are the final, immutable billing records exchanged via OCPI after a session completes. Here is how they work.
OCPI Sessions Module: Live Charging Session Tracking, Explained
How CPOs stream live session data to eMSPs over OCPI: when a session starts, how much energy has flowed, and how status changes get pushed.
Level 1 vs Level 2 vs DC Fast Charging: The Complete Guide
The three power tiers in EV charging: what each one is for, how fast each charges, and how the connectors map to each level.
What Is a CPO? What Is an eMSP? EV Charging Roles Explained
CPOs operate the charging stations. eMSPs own the customer relationship. The split is the foundation of how the EV charging industry actually works.
kW vs kWh: What Every EV Owner Should Know
kW is power (rate); kWh is energy (quantity). The distinction matters for chargers, batteries, and specs. The practical version.
OCPI Version History: 2.1.1 → 2.2 → 2.2.1 → 2.3.0 → What's Next
Every OCPI release from 2.1.1 through 2.3.0, plus the 3.0 preview: what each version changed, and which one a new integration should target.
OCPI vs OCPP vs OICP vs ISO 15118: A Plain-English Comparison
OCPI vs OCPP: one connects charging networks, the other a station to its operator. Plus OICP and ISO 15118, and which layer each lives at.
What Is EV Charging? A Plain-English Introduction
EV charging means refilling an electric vehicle's battery from an external source. The practical version every owner and professional should know.
OCPI Explained: The Protocol That Makes EV Roaming Possible
OCPI (Open Charge Point Interface) is the protocol that lets one charging network accept another network's customers. What it is and how it works.
Welcome to Learn EV Charging
What this site is, what we publish, and how to get the most out of it: a quick orientation for new readers.