Stop 07 of 08 · In practice

What does ISO 15118-20 add?

About 6 min · 3 questions ·

Friday
The situation

Back home, the driver reads that the next car model will support ISO 15118-20.

The dealer mentions bidirectional charging and a home charger that could use the car's battery.

The questionWhat does the newer part of the standard add?

Two generationsISO 15118 in four dates
ISO 15118-22014

network and application protocol, energy from charger to car

ISO 15118-202022

second generation, including bidirectional power transfer

Amendment 12026

AC DER service, megawatt charging, improved security

OCPP 2.12025

supports ISO 15118-20, including bidirectional transfer

Dates from ISO and the Open Charge Alliance.

Four additions

  • Bidirectional power transfer: ISO 15118-20 defines the messages and sequences for energy in both directions.
  • Wireless: it covers wireless communication for conductive and for wireless charging.
  • Automated connection: it adds requirements for automatic connection devices.
  • Megawatt charging and grid services: the amendment of 2026 adds an AC service for distributed energy resources (AC DER), an service and an improved security concept.

Where it leads

ISO 15118-2 was designed for energy from the charger to the car; its scope mentions bidirectional transfer only as use cases that need enhancements. ISO 15118-20 makes it part of the protocol. has its own path, Bidirectional charging, and megawatt charging is part of Truck charging.

Check your understanding

3 questions. Answer all of them to complete this stop. Each answer explains itself.

01Question 1 of 3

Which addition is part of ISO 15118-20?

02Question 2 of 3

What did Amendment 1 of 2026 add to ISO 15118-20?

03Question 3 of 3

Which OCPP version supports ISO 15118-20 with bidirectional transfer?

Further in other paths

  1. Bidirectional charging · Stop 04Which standards make it work?ISO 15118-20 between car and charger, OCPP 2.1 between charger and backend, and the EU rules around them: the stack behind a bidirectional session.
  1. ISO: ISO 15118-2:2014, Vehicle-to-Grid Communication Interface, Part 2: Network and application protocol requirements. https://www.iso.org/standard/55366.html. Checked 09 Oct 2026.
  2. ISO: ISO 15118-20:2022, Part 20: 2nd generation network layer and application layer requirements, and Amendment 1:2026. https://www.iso.org/standard/77845.html. Checked 09 Oct 2026.
  3. Open Charge Alliance: Open Charge Point Protocol (OCPP): versions 1.6, 2.0.1 and 2.1. https://openchargealliance.org/protocols/open-charge-point-protocol/. Checked 09 Oct 2026.
  4. ISO: ISO 15118-20:2022, Part 20: 2nd generation network layer and application layer requirements, and Amendment 1:2026. https://www.iso.org/standard/77845.html. Checked 09 Oct 2026.
  5. ISO: ISO 15118-20:2022, Part 20: 2nd generation network layer and application layer requirements, and Amendment 1:2026. https://www.iso.org/standard/77845.html. Checked 09 Oct 2026.
  6. ISO: ISO 15118-20:2022, Part 20: 2nd generation network layer and application layer requirements, and Amendment 1:2026. https://www.iso.org/standard/77845.html. Checked 09 Oct 2026.
  7. ISO: ISO 15118-20:2022, Part 20: 2nd generation network layer and application layer requirements, and Amendment 1:2026. https://www.iso.org/standard/77845.html. Checked 09 Oct 2026.
  8. ISO: ISO 15118-2:2014, Vehicle-to-Grid Communication Interface, Part 2: Network and application protocol requirements. https://www.iso.org/standard/55366.html. Checked 09 Oct 2026.
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