What comes to mind first when you hear "DC V2X discharging"?
Is it simply a workaround for vehicles like Teslas that lack native AC V2L capability, where owners are forced to use external DC discharging hardware like the WETOX D2 as a compromise?
In reality, portable V2L (Vehicle-to-Load) is just the entry point of a much broader DC V2X vision. On the global stage, high-power energy transfer through the DC port represents the true core of future energy management.
For home energy resilience (V2H), extreme weather events like severe heatwaves and winter storms frequently cause widespread grid outages. With battery capacities ranging from dozens to over a hundred kilowatt-hours, electric vehicles serve as reliable emergency backup power supplies, effortlessly keeping refrigerators, home heating, and medical equipment running.
For grid integration (V2G), as renewable energy sources like solar and wind expand, grid instability becomes a growing challenge. In markets across Europe and North America with substantial peak-and-valley electricity rate differences, charging EVs at low nighttime rates and feeding power back to the grid during high-demand daytime hours (V2G) helps balance grid loads while creating tangible financial returns for vehicle owners.
Extracting high-voltage DC directly through the vehicle's fast-charging port and converting it externally provides the optimal balance of vehicle design costs, thermal efficiency, and power output.
A Unified Global Communication Standard: ISO 15118 and the Next-Gen -20 Protocol
Enabling DC discharging requires a unified, highly secure communication language between the vehicle and external discharging equipment.
Outside of Mainland China (GB/T) and Japan (CHAdeMO), the global DC standard has reached near-total unification around CCS. Both Europe's CCS2 and North America's early CCS1 rely on Power Line Communication (PLC) at the architectural level. While Tesla initially relied on its proprietary TPC protocol, opening its design as NACS (SAE J3400) and releasing the official specification naturally aligned its platform with the PLC-based ISO 15118 international standard.
The International Organization for Standardization (ISO) stands as the world's largest and most authoritative standard-setting body. In the EV sector, ISO 15118 serves as the core international standard defining communication protocols between electric vehicles and charging or discharging equipment.
ISO 15118-20 represents the next-generation protocol within this framework. Its primary breakthrough lies in providing native, standardized architectural support for bidirectional power transfer.
The rollout of this standard is rapidly redefining market access requirements worldwide. Under the EU's Alternative Fuels Infrastructure Regulation (AFIR), all newly built public and private charging infrastructure must support EN ISO 15118-20 starting January 1st next year to achieve market compliance and operational eligibility. In North America, while there is no explicit federal mandate, SAE NACS bidirectional specifications and NEVI funding guidelines have made ISO 15118-20 the recognized universal benchmark for automakers and equipment manufacturers alike.
Major automakers including Volkswagen, Mercedes-Benz, BMW, and General Motors are integrating the -20 protocol as the foundational standard for V2X power output on their newest EV platforms. DC discharging, long viewed by some as an unofficial workaround, has formally transitioned into a regulated, globally standardized industry framework.
Global Compliance: WETOX Earns the World's First ISO 15118-20 Certification Issued by SGS
For users with strict requirements for safety and product quality, SGS requires little introduction.
In international testing, inspection, and certification, TÜV Rheinland, UL, DEKRA, and SGS are recognized as the top global authorities, representing the highest levels of quality, safety, and compliance assurance. Founded in 1878 and headquartered in Geneva, Switzerland, SGS is the largest and most established testing and certification organization among these global industry leaders. Certification reports issued by SGS carry unparalleled legal validity and trust across European, North American, and international markets.
WETOX has officially been awarded the world's first ISO 15118-20 certification issued by SGS.
Achieving this milestone from a world-leading testing authority demonstrates that WETOX has reached top-tier international standards in bidirectional DC communication control, safety architecture, and in-house software protocol development. It marks a significant step forward as the DC V2X equipment industry enters a new era of standardized global development.
Looking Ahead: Safety, Warranties, and Technological Readiness
Discussions occasionally arise regarding whether DC V2X equipment impacts official vehicle warranties.
These concerns are entirely understandable. From an operational standpoint, WETOX has delivered over 100,000 DC discharging units across Chinese GB/T markets over the past four years, maintaining a record of zero voided vehicle warranties. To provide complete peace of mind, WETOX product liability coverage extends beyond property damage to specifically cover vehicle warranty risk protection.
As a third-party equipment manufacturer, we do not dictate future policy directions for vehicle OEMs. However, universal international standards like ISO serve as the required technical foundation that automakers must adhere to when building their platforms. By strictly engineering products in compliance with ISO standards and building robust safety protections, we ensure seamless system compatibility and safe operation at the protocol level.
Because the ISO 15118-20 standard is quite new, vehicle software ecosystems are continuing their gradual rollout. At present, the WETOX D2 utilizes the established ISO 15118-2 protocol for V2L power delivery on Tesla vehicles, where the vehicle display indicates a standard charging state.
By establishing technical readiness and securing ISO 15118-20 certification through SGS early on, WETOX aims to give users complete confidence in our engineering foundation as the global V2X ecosystem continues to evolve.
Read the official announcement from SGS on LinkedIn: https://www.linkedin.com/posts/sgs-connectivity-and-products_sgsdigitaltrust-iso15118-evcharging-activity-7488239434895790080-bLaP
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