SAE J1634-2025 PDF

Full title and description

SAE J1634-2025 — Battery Electric Vehicle Energy Consumption and Range Test Procedure. This SAE Recommended Practice defines uniform dynamometer-based procedures, driving schedules and data-reporting methods to determine energy consumption (kWh/mi or kWh/100 km) and range for battery electric vehicles (BEVs), including guidelines for supplementary test cycles and environmental conditioning.

Abstract

Provides standardized test sequences (UDDS/FTP, HWFET/HFEDS and optional US06, SC03 and cold FTP procedures), test setup and instrumentation, preconditioning, charge/discharge handling, data capture and calculation methods to produce repeatable BEV energy-consumption and range metrics for light‑duty vehicles. Values produced are raw test outputs; regulatory corrections or labeling adjustments are applied outside the procedure.

General information

• Status: Revised / Current (latest revision 2025).
• Publication date: August 29, 2025 (J1634-2025 revision).
• Publisher: SAE International (Society of Automotive Engineers).
• ICS / categories: 43.120 (Electric road vehicles); related to 43.040 Road vehicle systems.
• Edition / version: SAE J1634-2025 (revision of J1634-2021).
• Number of pages: 61 (published pagination for J1634_2021; 2025 revision published by SAE — pagination may vary).

Scope

Establishes uniform dynamometer testing procedures for battery-electric light‑duty vehicles that use batteries as the sole power source. The procedure covers drive-cycle selection and repetition, vehicle preconditioning, ambient and cold-temperature testing, measurement of electrical energy into/out of the vehicle, data acquisition and processing, and reporting formats to determine energy consumption and estimated range under controlled laboratory conditions. It is intended for system-level evaluation (vehicle as a whole) rather than isolated subsystem tests.

Key topics and requirements

• Defined driving schedules and cycle repetitions (UDDS/FTP, HWFET/HFEDS; optional US06, SC03, cold FTP).
• Vehicle and battery preconditioning, state-of-charge handling, and charge/discharge procedures.
• Instrumentation, metrology, and data-acquisition requirements for electrical energy and auxiliary loads.
• Environmental control (temperature, humidity) and cold-temperature test procedures.
• Calculation methods for energy consumption (kWh/mi or kWh/100 km) and extrapolated range.
• Reporting formats, tolerances, and repeatability/replication guidance to minimize test-to-test variation.

Typical use and users

Used by vehicle manufacturers, automotive test laboratories, regulatory bodies, research institutions and independent test houses to generate comparable BEV energy‑consumption and range metrics for product development, certification support, labeling, regulatory compliance and benchmarking. Also used in R&D to evaluate effects of ancillary loads, climate control strategies and drive-cycle sensitivity on range.

Related standards

Commonly referenced alongside federal vehicle test procedures and fuel-economy labeling rules, other SAE dynamometer and test-method standards, and test-cycle standards (FTP/UDDS, HWFET, US06, SC03). It is part of a family of SAE light‑duty vehicle performance and economy documents and is used in conjunction with regulatory guidance for labeling and corporate average fuel economy where applicable.

Keywords

SAE J1634, battery electric vehicle, BEV, energy consumption, range test, dynamometer, UDDS, HWFET, US06, SC03, FTP, test procedure, vehicle labeling, kWh/mi, kWh/100 km.

FAQ

Q: What is this standard?

A: SAE J1634-2025 is a recommended practice that specifies laboratory dynamometer procedures and reporting methods to determine energy consumption and estimated driving range for battery-electric light‑duty vehicles.

Q: What does it cover?

A: It covers drive cycles, vehicle preconditioning, instrumentation and data acquisition, environmental conditioning (including cold testing), calculation methods for energy consumption and range, and reporting formats to ensure repeatable, comparable results.

Q: Who typically uses it?

A: Vehicle OEMs, independent test labs, regulators, research organizations and consultants use J1634 for development testing, certification support, labeling substantiation and comparative benchmarking of BEV performance.

Q: Is it current or superseded?

A: Current — the document was revised in 2025 (J1634-2025). It supersedes earlier revisions, including the 2021 edition.

Q: Is it part of a series?

A: Yes — J1634 is part of SAE’s light‑duty vehicle performance and economy recommended practices and is frequently used alongside other SAE dynamometer, electrical-measurement and vehicle-test standards and applicable regulatory test-method documents.

Q: What are the key keywords?

A: Battery electric vehicle, BEV, energy consumption, range, dynamometer, UDDS, HWFET, US06, SC03, FTP, vehicle test procedure.