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Toyota Develops V2H System for Electric Vehicles and Homes

Toyota Motor Corporation (TMC) has developed a vehicle to home (V2H) system for the mutual sharing of power between plug-in electric vehicles and homes.

The V2H system is to start testing, using Prius PHVs, at the end of 2012 in approximately ten households as part of the Toyota City Low-Carbon Verification Project (Toyota City Project) that began in April 2010.

The newly developed V2H two-way electric power supply system can supply power from home to vehicle as well as from vehicle to home. An AC100 V inverter onboard the Prius PHV converts stored power into AC suitable for home use, while power flow is controlled according to communication between vehicle, charging stand and the home. With this new method, low-carbon electricity (“green” electricity) generated from regional or home solar generators, or low-cost late night electricity, can be stored in a vehicle’s drive battery and then used to supply power to the household during peak consumption times. This kind of optimal energy flow can be automatically controlled by a home energy management system (HEMS).

Vehicle batteries can also be used as a power source in times of emergency by manually setting the electricity flow to supply power from the vehicle’s drive battery through the charging stand to a home’s lights and power outlets. With a fully charged battery and full tank of gasoline, a Prius PHV can supply power for average Japanese household electricity use (approximately 10 kWh) for four days.

Interest in smart grid technology and expectations for the effective use of electric vehicle batteries has increased due to recent anticipated electricity shortages in Japan, the beginning of full-scale renewable energy introduction and an increased need for emergency power supplies.

Households participating in the verification tests in Toyota City will use Prius PHVs, which can use the V2H system to supply electric power to homes, as well as function as conventional gasoline-electric hybrid vehicles once onboard electricity supply depletes to a certain level.

TMC developed its V2H system while closely complying with existing charging and communications specifications defined by the International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC), as well as with electrical safety standards and regulations. Going forward, TMC hopes to promote the widespread use of V2H systems while closely studying – conscious of standardization trends – system, hardware, power generation and other relevant specification standards.

In addition to the V2H system, TMC has also developed devices capable of supplying electricity from PHVs directly to home devices, for use at emergency shelters in the event of a disaster. The devices will be installed on the PHVs used in this round of the Toyota City Project tests.[wzslider height=”400″ lightbox=”true”]

Jun 4, 2012Blagojce Krivevski
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Blagojce Krivevski

Blagojce Krivevski is physicist and green technology lover. Keep in touch with Blagojce through his email, web site, Twitter, Linkedin, Facebook and Google+.

June 4, 2012 Electric Car Newselectric vehicles, Prius PHV, toyota, Toyota V2H System, V2H System, Vehicle-To-Home
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