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http://www.greencarcongress.com/2012/11/upa-20121106.html
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BYD Ltd and Utility Partners of America (UPA) have put into service a 500 kWh containerized energy storage system (ESS) for one of the largest investor-owned utility companies in North America. The 40-foot unit is located in south Charlotte and has several BYD-vertically integrated components including a 200 kW bi-directional, UL-compliant BYD inverter with BYD’s 500 kWh Iron Phosphate battery.

Expected service life of the Iron-Phosphate batteries is more than 25 years. BYD mega-watt-scale energy storage stations are installed in several locations in the US and are rated at a 91% AC-DC-AC round-trip-efficiency ...
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http://www.greencarcongress.com/2012/11/saft-20121107.html
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Saft has been selected by Cowessess First Nation (CFN) to design, produce and install a battery energy storage system (ESS) including two Intensium Max 20E lithium-ion battery containers as part of the High Wind and Storage Project near the City of Regina, Saskatchewan.

The Regina project is the first wind power application for Saft in North America. The grid-connected ESS system will help optimize renewable wind power performance by increasing reliability and decreasing volatility by as much as 70% over the 15-year lifespan of the system. Each Li-ion ESS includes a 400 kW Power Conditioning System for use in conjunction with an 800 kW utility scale wind turbine.

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These projects are small, but you have to start somewhere. Compare the 500 kwh energy storage capacity of the BYD system to that in a Nissan Leaf battery at 24 kwh. A decade down the line the Leaf battery is expected to have 70-80% of it's capacity when new. Call it 18kwh. Thats 28 used Leaf batteries to equal the 500 kwh BYD system.

Bulk energy storage will get a lot cheaper down the road.
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