Plugless Power

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Plugless Power
Plugless Power Logo with slogan.png
Product type Electric Vehicle infrastructure
Owner Evatran LLC
Country United States
Introduced 2011
Markets United States

Plugless Power[1] is a family of Electric Vehicle Supply Equipment (EVSE) products manufactured by Evatran that enable inductive charging for electric vehicles (EV). The Plugless Power EVSE wirelessly delivers electrical power to the on-board EV battery charger using electromagnetic induction without a physical connection to the vehicle. An EV equipped with a Plugless Power Vehicle Adapter can be charged by parking it over an inductive Plugless Power Power Pad. The active step of plugging a cord into the vehicle is eliminated. Idaho National Laboratory (INL) testing in 2013[2] found the system had a power delivery efficiency between 84%-90% depending on the alignment of the Adapter and Pad, the separation gap, and the rate of power transfer in use (kW).

History and development[edit]

Evatran LLC
Type Privately held company
Industry Electric vehicle infrastructure
Founded April 2009
Founders Thomas Hough, Rebecca Hough
Headquarters Wytheville, Virginia, United States
Area served United States
Key people Thomas Hough (Founder, Chairman)
Rebecca Hough (Co-Founder, CEO)
Brian Normann
Kevin Beck
Products Inductive charging system
Parent MTC Transformers
Footnotes / references

Proponents of wireless, inductive charging say that it offers a means of minimizing costly EV recharging infrastructures and providing another path to industry standardization, increases user convenience, and will promote EV adoption. Opponents note the reduction in power transmission efficiency (e.g. 10%-16% for the Plugless Power system[2]) from inductive transmission and suggest the convenience is an excessive luxury.[3][4][5][6]

In simple terms, inductive charging works by separating the two halves of an electric transformer with an air gap – one half, the Plugless Power Vehicle Adapter, is installed on the vehicle and the other half, the Plugless Power Power Pad, is installed on the floor of a garage or in a parking lot. When a car with an Adapter drives over a Pad, the two pieces are brought into close proximity, 70–130 mm (2.8–5.1 in), then current from the electrical grid flows through the coils in the Power Pad to create magnetic fields and these fields induce current flow in the Vehicle Adapter's coils to charge the battery.

Claimed to be the world’s first hands-free plugless, proximity charging system for electric vehicles, it is a clean technology product project of Evatran, formally begun in 2009. Most competing technological EV charging development appears to be focused on speed of charge rather than convenience and ease.[citation needed] Some industry people point to standardized inductive charging as a means of minimizing problematic infrastructure.[citation needed]

Plugless Power's dual-component EVSE (Electric Vehicle Supply Equipment) underwent field testing and is expected to be available in the fourth quarter of 2010.[3][7]


Founded in 2009, Evatran was formed as a clean technology subsidiary of MTC Transformers, an award winning American manufacturer[8] of high-quality, precision-engineered transformers and rewind services based in Wytheville, Virginia. Evatran is utilizing over a century combined engineer's experience to innovate Electric Vehicle inductive charging with Plugless Power. The need for frequent charging of Electric Vehicles (EVs) and the means are a concern for inhibiting popular adoption of EVs that the inductive charger attempts to address, providing the infrastructure required to make electric vehicles widely viable. Evatran claims Plugless Power to be the world’s first hands-free, plugless, proximity charging system for electric vehicles and extended-range hybrids.[3]

Utilizing a dual-component system based on inductive technology, Evatran’s Plugless Power streamlines the charging of electric vehicles and extended-range hybrids by eliminating the physical connection and cable. The company claims a resultant automatic electric-vehicle charging system that is convenient, fast, safe, affordable, and potentially universal. Evatran’s customers are manufacturers, dealers, and drivers of electric or extended-range hybrid vehicles.[5] Other customers utilizing Plugless Power may include corporations, municipal governments, utilities, residential developers, new homebuilders, retailers, and small businesses.[3]

See also[edit]


  1. ^ "Plugless Power website". 2009. Retrieved 2009-09-19. 
  2. ^ a b "PLUGLESS TM Level 2 EV Charging System (3.3 kW) by Evatran Group Inc., INL/MIS-13-29807" (PDF). Vehicle Technologies Program. U.S. Department of Energy Idaho National Laboratory. 2013-08-14. pp. 2–3. Retrieved 13 March 2014. 
  3. ^ a b c d Jim Motavalli (February 26, 2010). "Evatran Hoping To Cash In On Plug-Free Electric Cars". CBS Interactive Inc. ( Retrieved 2010-03-09. 
  4. ^ Bennett, Bo (September 1, 2009). "EVcast #267: There and Back Again...Eventually". Retrieved 2009-09-19. 
  5. ^ a b "New Subsidiary Formed to Charge Electric Vehicles". Virginia Business. August 31, 2009. Retrieved 2009-09-19. 
  6. ^ "Local company develops prototype to change face of electric cars". WVVA TV Bluefield Beckley WV. September 24, 2009. Retrieved 2009-09-19. 
  7. ^ Susan Wilson (March 1, 2010). "Evatran provides a plugless solution for EVs". Retrieved 2010-03-09. 
  8. ^ "Profile". 2009. Retrieved 2010-03-09. 

External links[edit]