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Disaster-prevention House to Come With PV System, Battery, Fuel Cell

Electricity, heating, hot water can be supplied for 10 rainy days

2019/03/13 23:21
Sousuke Kudou, technical writer
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The newly-developed "KyureK" load-bearing wall (source: Daiwa House)

Daiwa House Industry Co Ltd will release a house that is resistant to primary and secondary disasters at the time of natural disaster in Japan April 1, 2019.

Equipped with "All-Weather Three Battery Linking System," the house, "House Prepared for Natural Disasters," can supply electricity, heating and hot water for about 10 days even when it is raining.

The All-Weather Three Battery Linking System reduces fuel and light expenses at normal times by making (1) a solar power generation (PV) system (output: 5.5kW), (2) the Ene Farm fuel-cell cogeneration system (output: 650kW) and (3) residential lithium-ion (Li-ion) storage battery (capacity: 5.4kWh) work in conjunction with one another. The output of the PV system becomes 5.5kW in the case of a two-story house with an area of 125.4m2 (model plan).

Daiwa House developed a "cross board" that links three kinds of power sources. It enables to use electricity generated by the Ene Farm in the house at the time of a long-term power outage or store it in the storage battery. At normal times, by using electricity generated by the Ene Farm and the PV system in the house, it becomes possible to reduce fuel and light expenses by about 84.2%, compared with houses that meet power-saving standards of 2002.

It is possible to select a solar panel from products of multiple manufacturers. The Ene Farm is a product of Panasonic Corp, and the storage battery is a product of Eliiy Power Co Ltd. Also, the house can support ZEH (net zero energy house) upon request of customers.

Moreover, the house can come with (1) the newly-developed "KyureK" load-bearing wall that can reduce the shaking of building by up to 50%, compared with Daiwa House's existing detached houses, (2) "Rooga" disaster-prevention roof tile, which absorbs impacts caused by flying objects at the time of violent wind such as typhoon and prevents damages, and (3) "Disaster-prevention, Crime-prevention Glass," which doubles the thickness of the intermediate layer of laminated glass.

They will be sold as options for Daiwa House's detached houses. When all the options are added to a model plan (two-story house with an area of 125.4m2), they are expected to be an additional cost of about ¥5 million (approx US$44,924). The company aims to sell 160 units of the house per year.