Small Solar

• http://www.seeedstudio.com/depot/power-supply-c-155.html
• http://www.enocean.com/en/enocean_modules/ecs-310/

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• http://www.rfm.com/products/apnotes/anm1002.pdf
• http://simple-project.org/publications/2005/minami-inss-05.pdf