SolarCity, the Silicon Valley solar installer, has quietly begun to offer some homeowners a lithium-ion battery pack made by electric carmaker Tesla to store electricity generated by their rooftop photovoltaic arrays. Stem, another Silicon Valley company, will sell or lease a $100,000, 54-kilowatt-hour battery pack to businesses so they can arbitrage the grid by storing electricity when rates are cheap and then using that energy when they’re high. — qz.com
Without access to the grid, the Alonsos added photovoltaics and hydro power and worked to ensure the home wouldn't use much energy. The original position of the stable worked to their favor. The southern exposure allows for the sun to be the main source of heat during the winter.
The Alonsos also added large wooden shutters that slide closed like a second skin, covering the large windows at night to trap in most of the home's daily solar heat gain. — http://faircompanies.com
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