3 Types of Batteries, V2H System Realize 100% Power/water Self-sufficiency

2017/05/16 19:08
Sousuke Kudou, technical writer & Kenji Kaneko, Nikkei BP Intelligence Group, CleanTech Institute
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"OTS House" (source: Tokai Holdings)

Tokai Holdings Corp will build "OTS House," which uses sunlight, LP (liquefied petroleum) gas and rainwater to completely meet its own demand for electricity and water, in Shimada City, Shizuoka Prefecture, Japan, for verification.

It supplies electricity by using solar power generation facilities, storage battery and fuel cell and daily life water by circulating rainwater.

The OTS house means a house where residents are protected just by living in it (on the spot). The construction of the house started April 27, 2017. Tokai Holdings will complete the construction and start the verification at the end of July 2017. The house is planned to be open to the public in October 2017 after all the facilities are completed in October 2017.

In addition to Tokai Holdings, the project is participated in by Tokai Corp (Shizuoka City), Tokai Communications Corp (Shizuoka City), Tokai Gas Corp (Yaizu City, Shizuoka Prefecture) and Tokai Cable Network Corp (Numazu City, Shizuoka Prefecture), which are affiliated with Tokai Holdings.

In addition to solar cells mounted on the roof of the house, Tokai Holdings will combine (1) a fuel cell co-generation system (Ene Farm), (2) a three-battery system using stationary storage batteries (capacity: 5.62kW, average power generation: 15.4kWh per day) and (3) a V2H (vehicle-to-home) system using solar power and an electric vehicle (Leaf) (capacity: 4.28kW, average power generation: 11.7kWh per day) to realize the "perfect self-sufficiency of electricity," which does not require commercial power.

Also, rainwater will be stored and used as daily life water by using a water purification system. Moreover, part of water discharged from daily life is repurified and used as daily life water. With this circulation of water, the demand for water (about 800-900L per day) is met only by using rainwater throughout the year, eliminating the need for water supply and sewerage systems (perfect self-sufficiency of water).