Next generation ISO 15118 introduces wireless and bidirectional charging

Marc Mültin
Marc Mültin
February 12, 2019
• Updated
min read
Next generation ISO 15118 introduces wireless and bidirectional charging

An introduction to ISO 15118-20, the newest member of the communication standard.

Did you know that the ISO 15118 communication standard currently consists of eight different parts? It can be overwhelming to work with this complex and future-proof technology due to the vast amount of charging-related use cases the standard covers. The good news is that ISO 15118 serves as a unified communication protocol that covers all charging-related use cases. However, this myriad of functionality also adds to its complexity. In this article, we won’t cover all the different parts that ISO 15118 comprises. Today, I’m going to take this opportunity to introduce to you ISO 15118-20, the newest member of the document family.

ISO 15118-2 Ed. 2 is now called ISO 15118-20

The International Organization for Standardisation (ISO) changed the part number of ISO/DIS 15118-2 (Ed. 2) to ISO/DIS 15118-20. The project team currently working on the second edition of ISO 15118 requested this change after the last conference call in December 2018.

This means that the former project title

ISO/DIS 15118-2 (Ed2): Road vehicles -- Vehicle to grid communication interface -- Part 2: Network and application protocol requirements

… is now called

ISO/DIS 15118-20: Road vehicles -- Vehicle to grid communication interface -- Part 20: 2nd generation network and application protocol requirements.

The “DIS” in the title is short for “Draft International Standard”, which is usually the first version of a standard that is available for purchase.

The main reason for this change is that ISO 15118-20 is not compatible with ISO 15118-2 because it comes with a series of changes and a whole new set of features. Among these changes are a rearranged message structure and newly added messages that account for features like wireless charging, bidirectional energy transfer, and ACD charging. ACD is short for automated connection device and refers to wired charging systems that don’t require the user to manually plug in a charging cable. The first ACD use case is mainly specified by Siemens and describes how buses can be charged via pantographs.

ISO 15118-20 also comes with a higher level of security since encrypting the communication channel between the EV and charging station using Transport Layer Security (TLS) is no longer just an option, but it is now mandatory for all use cases.

When will ISO 15118-20 be published?

Due to this change, the latest possible date to publish ISO 15118-20 as an international standard (IS) is now February 2021. However, the project team aims to have this part of the standard published by the end of 2020. The registered experts are currently gathering in weekly web conferences to discuss all open technical and editorial comments and to find solutions. By summer 2020, we should have a Final Draft International Standard (FDIS)  that reflects all of the final technical changes. Only editorial changes will be allowed once an FDIS has been published. In case you are not a member of the project team but would like early access to ISO 15118-20, you’ll be able to purchase that document through ISO.

Update Jan 18, 2020: The publication date has been updated, previously the blog post stated that ISO 15118-20 would be ready by Q1 2020 at the latest. The publication date has been shifted due to the enormous amount of work needed to consolidate all comments.

How will ISO 15118-2 evolve?

Introducing different generations of ISO 15118 as different document parts will allow for better revisions of each part. That said, what is the plan with ISO 15118-2? This first edition of ISO 15118 is currently being implemented and brought to market by EV and charging station manufacturers and service providers across the globe (see also my previous blog post on “EV Charging Communication Events and Trends In 2019”). But how can we handle necessary bug fixes with this protocol version?

One idea would be that CharIN, the Charging Interface Initiative e.V. behind the Combined Charging System (CCS), will provide amendments or a corrigendum for those parts of the document that are ambiguous and could cause interoperability issues between different vendors. It’s also possible that after having gathered enough input from the market, a dedicated project team could work on a second edition of ISO 15118-2 that could be published much more quickly than the three to four years that is usually needed for a new standard. It all depends on how fast the team members agree on the introduced changes.

Resources for your perfect jumpstart with ISO 15118-2

Are you already implementing ISO 15118-2 and facing technical challenges? Or do you want to dive into this technology but don’t know how to effectively get started? You’ve come to the right place. I’ve prepared a series of comprehensive resources for beginners and experts alike. Take a look at the ISO 15118 Manual and my online courses. If you’re interested in setting up a consulting session or if you have questions about the available resources, don’t hesitate to reach out to me directly via email. I look forward to hearing from you.

ISO 15118
Marc Mültin
Marc, the Founder and CEO of Switch, has over 13 years of experience in the e-mobility space and holds a PhD in Computer Science. He is the leading global expert and co-author of international EV communication standards (ISO 15118 & OCPP 2.0.1) that underpin the Switch platform.
Connect with
Marc Mültin

An e-book for beginners and experts alike. Reduces the steep learning curve of ISO 15118 by providing a comprehensive and easy-to-understand access to the Vehicle-to-Grid communication protocol. Written by our founder, one of the few co-authors of ISO 15118, this e-book has fast become standard literature in the industry.

Single User


All the knowledge you need to become an ISO 15118 expert


  • Saves you many days of tiresome trial and error
  • Helps you to really understand ISO 15118
  • Free updates delivered to your inbox
Buy now
Multiple users


Are you interested in copies for your colleagues or students? We offer company-wide licenses as well as licenses for academic libraries.


  • Train your team on this future-proof technology
  • Provide access to students of e-mobility tech
  • Ensure updates for each employee / student
  • Unlimited number of copies included in purchase
Request now
Switch Ev | ISO

Want to try before you buy?

Get an extract from each chapter to see the quality and in-depth information you’ll get in the full e-book. The ISO 15118 Manual definitely helps you grow your expertise and positioning in the e-mobility market.

Provide your name and email address to get it delivered to your inbox.

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

Join a group of experts in the know

Since we have published our ISO 15118 Manual it has been purchased by the biggest names in our industry and has become standard literature.

as well as Daimler, Porsche, Shell, Tritium, and many more...

As we were intensively implementing and testing
ISO 15118, we noticed there was a lack of overview of Plug & Charge and the whole supply chain amongst
our stakeholders.

Our training with Marc helped us achieve a much better understanding of the whole ecosystem. It led to constructive discussions on the requirements and concept of ISO 15118 in general.

Angelika Neuleitner,

charging system Specialist at Ionity

Working with recognized standards is the right way forward for the integration of electric vehicles into the grid, and we value Switch’s strong experience with the ISO 15118 standard.

We were able to leverage Marc’s insights to corner some of the keys issues pertinent to V2G in the published standard that needed to be addressed.

Hamza Lemsaddek,

Director embedded solutions at Nuvve Corporation

Attending Switch’s intensive two day training with the team gave us a deep dive into ISO 15118 and the different use cases.

We were able to validate our design with regards to the ecosystem and beyond. We now have a head start for the development of our next generation chargers and are able to support our customers for the deployment of the equipment all over Europe.

Johan Devos,

business development Manager at ENOvates

Certificate handling in ISO 15118 is a quite complex issue. Marc’s well prepared one-day course on this topic and his deep knowledge helped us to train our team and speed up the development of the ISO 15118 Plug & Charge
charging controller.

Johannes Bergmann,

eMobility Charging Systems DEVELOPER at SIEMENS AG

When I was working with students on ISO 15118 projects, Marc's courses tremendously helped in getting students to understand the standard quickly and dive into coding without hesitation. Marc's crystal-clear explanations with eye-catching graphics will make you an EV charging expert in one week.

Minho Shin,

Professor at Myongji University

In two exciting training days, Marc quickly and effectively explained ISO15118 communication to our experienced development team. In addition to the in-depth technical knowledge, the information about the communication standards that are still being established is very valuable. The training will definitely help us to make the implementation more effective.

Reinhard Starzinger,

Project Manager Electric Mobility AT Keba AG


Related reads

Latest News