ISO 8714:2023 PDF

Overview

ISO 8714:2023 - "Electric road vehicles - Reference energy consumption and range - Test procedures for passenger cars and light commercial vehicles" specifies standardized laboratory test procedures to determine the reference energy consumption (Wh/km) and reference range (km) of purely electrically propelled passenger cars and light commercial vehicles. The standard applies to vehicles with a maximum authorised total mass of up to 3 500 kg and maximum speeds of 70 km/h or more, and it defines measurements performed on a chassis dynamometer using repeatable driving sequences.

Key topics and technical requirements

• Test methods
  • Consecutive Cycle Test (CCT): repeats an applicable driving test (ADT) cycle until end-of-test criteria are met.
  • Shortened Test: runs a selected number of ADT cycles followed by a constant speed segment (CSS) (or optional constant-power DC discharge) to accelerate RESS discharge and shorten duration.
• Selection of ADT cycle and CSS speed
  • Select a relevant regional ADT cycle; CSS speed is determined per methods in Annex B or by a relevant regional ADT standard.
• End-of-test criteria
  • Defined for vehicles able to follow the speed trace and for vehicles with lower max speed, including on-board instrument warnings; stop within 60 s once criteria are met.
• Tolerances
  • Speed tolerance ±2.0 km/h and time tolerance ±1.0 s, geometrically combined; a single deviation up to 4 s is allowed per cycle.
• Measurements and accuracy
  • Specifies measurement of AC and DC electrical energy and distance, and required parameter units/accuracy (time, distance, energy). Results yield reference energy consumption (Wh/km) and reference range (km).
• Definitions and test mass
  • Key terms include RESS (rechargeable energy storage system), complete electric vehicle kerb mass, and test mass (explicit mass calculation rules are provided).

Practical applications and users

ISO 8714:2023 is used by:

• Vehicle manufacturers for design validation, range and efficiency verification, and product claims.
• Test laboratories and certification bodies performing reproducible energy consumption and range testing on EVs.
• Regulators and policymakers for harmonised test methods when setting performance or labelling requirements.
• Researchers and fleet managers for benchmarking vehicle efficiency and operational range under standardised conditions.

Practical outcomes include comparable Wh/km figures for vehicle comparison, reliable range estimates for consumer information, and standardized test reports for conformity assessment.

Related standards

Normative references cited in the document include:

• ISO/TR 8713 (Vocabulary for electrically propelled road vehicles)
• ISO 8715 (Road operating characteristics)
• ISO 10521 (Road load)

Keywords: ISO 8714:2023, electric road vehicles, reference energy consumption, reference range, test procedures, passenger cars, light commercial vehicles, chassis dynamometer, consecutive cycle test, shortened test, constant speed segment, RESS.