Several articles on the WETOX website have already covered what V2L is, how it works, and its practical applications. In this article, we’ll take readers through the fascinating history and evolution of Vehicle-to-Load (V2L) technology.
When it comes to V2L, the first thing that comes to mind is V2L from EVs—and for good reason. With batteries offering tens or even hundreds of kilowatt-hours, EVs are undoubtedly the optimal solution. However, as electricity is the lifeblood of modern civilization, humanity’s exploration of mobile power sources has never ceased. Even for gasoline-powered cars, which inherently lack the same advantages, engineers have spent the past few decades searching for viable solutions.
The concept of using a vehicle as a mobile power source was first introduced by the GMC Terradyne concept car, which debuted at the 2000 North American International Auto Show (NAIAS). It featured a built-in generator capable of providing 5kW of power output. In 2004, the 42V mild-hybrid Chevrolet Silverado hit the market; its electric motor was used not only to start the engine but also to charge three 14V lead-acid batteries.
More recently, the gasoline-powered Ford F-150 has come equipped with the Pro Power Onboard system, which uses the internal combustion engine to drive a built-in generator, supporting multiple power output levels.
However, it’s clear that V2L in gasoline vehicles is severely limited by their small battery capacities, allowing only short bursts of electricity. Additionally, high fuel consumption and emissions make them less practical for widespread adoption outside of work-oriented vehicles like pickup trucks.
Japan, known for its strong culture of disaster preparedness, was also an early adopter of the V2X concept. In 2010, Nissan introduced its “Leaf to Home” technology, making the Nissan Leaf—which utilizes the CHAdeMO standard—the world’s first EV to support bidirectional charging. Nissan also released a dedicated inverter and home energy management system, with V2G (Vehicle-to-Grid) pilot programs already underway in some regions.
In 2012, Mitsubishi Motors, also using the CHAdeMO standard, launched the MiEV Power Box—an inverter compatible with its i-MiEV EV. This marked the debut of the world’s first DC V2L adapter, although its maximum output was limited to just 1.5kW.
Unfortunately, as we’ve seen, Japanese automakers did not pursue aggressive EV transitions over the following decade. Despite pioneering V2X concepts, they failed to push this forward-thinking technology onto the global stage. Even today, hybrid models like the Prius and AQUA remain constrained by their small battery capacities, limiting their V2L output to 1.5kW and rendering applications like V2H and V2G unattainable.
It was Chinese automakers that truly brought V2L technology into the mainstream. In 2015, BYD launched the Qin and Tang models, which were the world’s first vehicles to support V2L through their AC charging ports.
Although the Toyota Prius PHEV introduced bidirectional OBC-based V2L technology as early as 2011, it was limited by its focus on emergency disaster scenarios. The power outlets were placed inside the car—either in the rear seats or trunk—with a maximum output of just 1.5kW. It wasn’t until the 2023 Prius PHEV that Toyota added support for discharging via a V2L adapter through the vehicle’s external charging port.
In contrast, the BYD Tang featured a 3.3kW output and supported discharging via the vehicle’s charging port, enabling much more versatile applications. Its ability to supply power outside the vehicle made it inherently suitable for the outdoors.
Over the following years, China experienced a massive camping boom, and V2L technology quickly became a key selling point for nearly every automaker. Today, in the Chinese market, it is increasingly difficult to find a new EV that doesn't come equipped with V2L functionality.
NIO made a bold and innovative move to promote its battery-swapping technology by removing the OBC configuration from all its models. As a result, these vehicles can only support DC fast charging and do not allow AC slow charging—nor can they achieve native AC discharging. While this represents a forward-thinking innovation, it has also sparked considerable debate among owners.
To address user needs, NIO officially introduced a bidirectional charging and discharging unit. By switching and reconfiguring connectors, it supports 2.8kW charging and 3.5kW discharging. The system operates through the vehicle’s DC charging port for both charging and discharging, with inversion or rectification handled by the external adapter.
So, over the past two decades, numerous countries and automakers around the world have made their own choices regarding V2L implementation. Yet, why has Tesla, whose mission is "Accelerating the world's transition to sustainable energy," remained silent on this feature for so long?
As an independent brand, WETOX cannot provide a definitive answer. One earlier theory suggested that V2L might conflict with Tesla's Powerwall product. However, with the release of the Cybertruck—which comes factory-equipped with V2L—this speculation now seems less convincing.
Based on Elon Musk’s "First Principles" approach, we believe that cost is the primary reason why the Tesla Model 3, Model Y, Model S, and Model X do not natively support V2L.
A bidirectional OBC is significantly more expensive than a unidirectional OBC in terms of Bill of Materials (BOM) costs. Moreover, as the OBC is historically one of the more failure-prone components, even when used solely for charging, it generates substantial after-sales service costs. Allowing millions of owners to use it for discharging would likely lead to even higher maintenance expenses for the company.
At Tesla’s 2023 Investor Day, in response to a question about V2L, Elon Musk stated: “I don’t think very many people are going to want to use bidirectional charging, unless you have a Powerwall, because if you unplug your car, your house goes dark, and this is extremely inconvenient.”
At the same event, Drew Baglino, then Tesla’s Senior Vice President of Powertrain and Energy Engineering, explained: “The lack of bidirectional charging was not really a conscious decision, but rather not a priority at the time. The company is working on reducing costs while adding functionality, aiming to offer more for less.”
WETOX fully agrees with Tesla’s philosophy of efficiency. However, while not every owner may need this feature, among the over 6 million Tesla owners worldwide, there is a clear demand for V2L from specific power users. Our mission is to provide the highest-quality DC V2L adapters for those who need them most.
The WETOX D2 is built in full compliance with J3400, NACS, and ISO-15118 standards, enabling Tesla vehicles to achieve V2L without any modifications. Users who require this feature can purchase it separately, rather than spreading the cost across all owners. We believe this approach offers a fairer, more efficient solution for everyone.
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