http://www.windenergyplanning.com/xcel-wind-energy-battery-results/ Renewable energy is essential to modern society - reducing harmful emissions from fossil fuels and making us more self sufficient. This site will explore what people are doing to help get us closer to a greener, renewable energy sourced world Wed, 08 Feb 2012 13:15:11 +0000 http://wordpress.org/?v=2.9 hourly 1 http://www.windenergyplanning.com/xcel-wind-energy-battery-results/comment-page-1/#comment-7716 Haruchai Sun, 10 Oct 2010 21:52:31 +0000 http://www.windenergyplanning.com/?p=2278#comment-7716 The 75% efficiency is for AC current over the predicted system life - which is about 10-15 years. DC is as much as 85% over the same time span. So, the short-term efficiency, say the first few years, is typically 87%-92%, depending on the application. The 75% efficiency is for AC current over the predicted system life – which is about 10-15 years. DC is as much as 85% over the same time span.
So, the short-term efficiency, say the first few years, is typically 87%-92%, depending on the application.

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