The newly-developed "KyureK" load-bearing wall Photo: Daiwa House)

Disaster-prevention house to come with PV system, battery, fuel cell

By Sousuke Kudou

Daiwa House Industry Co Ltd on April 1 will release a house that is resistant to primary and secondary disasters.

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

The 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 use of electricity generated by the Ene Farm in the house at the time of a long-term power outage or store it in the 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'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 cost an additional ¥5 million. The company said it aims to sell 160 units of the house per year.

© Nikkei Technology Online

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We have 2 x 110ah deep cycle batteries attached to 2x100w panel with controller and adaptor. cost 30,000Y all in the summer we even run a small a/c off it in the day. the above looks interesting but my pockets are not so deep.

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 Ene Farm fuel-cell cogeneration system (output: 650kW)

I'm pretty sure that must be wrong. 650kW??!!! More like 650W

If I'm not mistaken an Ene-farm is a natural gas (or hydrogen)-powered dynamo that heats water with the waste heat of producing electricity. It is basically a water heater, which every home needs, but gives you a bit of electricity as well. Which is all great, but in combination with solar panels, it's going to be creating electricity that may not be needed every time it heats water. Power companies do not want to buy little amounts of green energy off people. Such energy generates feed-in tariffs (that other users pay for) and does not follow demand.

Having lots of green tech machines that have limited utilization and will eventually break in a house is not eco. Solar PV for electricity, solar thermal for hot water, and a back up water heater would be cheaper and more eco.

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Today  07:24 pm JST

Posted in: Disaster-prevention house to come with PV system, battery, fuel cell See in context

 Ene Farm fuel-cell cogeneration system (output: 650kW)

I'm pretty sure that must be wrong. 650kW??!!! More like 650W

If I'm not mistaken an Ene-farm is a natural gas (or hydrogen)-powered dynamo that heats water with

Its called fuel cell, so its like in a Mira, and produces electricity from a tank of hydrogen, so yes 650kw is possible and no waste heat, just water .

We have six kW (24panel) as standard, with five kW inverter fitted as standard for four thousand dollars, am just converting some NiMH Prius Batteries for storage.

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To run your Ene Fuel Cell is quite expensive, then after ten days all the hydrogen is used up and you need to wait for the Hydrogen Tanker to come to your house to deliver more H2 !

The cost of operating a 1kW fuel cell for 7.26 hours when only one cylinder is purchased per month is $134. This is equivalent to$18.40 per hour to operate at one kilowatt.

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Will, the existing enefarm devices run on nat gas, they never need to be refilled. Moving forward, Japan does plan to pivot to H2 in the devices as it becomes possible to deliver the H2 in the existing nat gas pipeline network. There will never be truck delivery. Also, the residential 'chp' devices (combined heat power) do generate heat. The heat is captured and used in the home also, making the devices incredibly efficient. I am not an engineer and do not know the number, but I have read ( : ) ) the price of the power that the chp devices is already cheaper than grid delivered power. Not including the heat recovery. The devices are incredibly efficient and save owners money. There is an existing fleet of almost 300,000 of them in Japan today; and they plan on deploying 5,000,000 between now and 2030. Most or all of the new ones moving forward will use H2, not natural gas.

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Only for the rich....

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In the not so distant future, the solar panels will be splitting water and the fuel cell will be running on hydrogen provided by the solar panels.

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What about the Toilet - does it have it's own cesspool ? I guess it all depends upon where you live. I doubt very much it would have helped many on 3/11.

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With regards to toilet the "split system" separating solids and liquids is such and amazing easy system to make for an outhouse type set up and really low on smells. you can buy the seats pre made and build the rest yourself.

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