SuperCap Review Electrochemical Energy Storage Performance Metrics Winter 2012

John Miller looks at the numbers that make SuperCaps the best choice.

Whenever a new energy storage technology is reported, almost inevitably the first questions asked, and the first data cited, focus on its "Watt hours per kilogram" (Wh/kg) figure. This refers, of course, to specific energy, a metric that dates historically to the days when very heavy batteries provided almost the only means available to store electrochemical energy. Despite, and almost in defiance of the emergence of newer energy storage technologies however, specific energy continues to be referenced without further consideration as the most important . . .