Disclosed is a method of supplying DC power to equipment using proton exchange membranes (PEMs). PEMs run on hydrogen to produce DC electrical power. In the disclosed embodiment these PEMs are used as an alternative source of power to AC sources. One of these other sources is generated by an array of...http://www.google.co.uk/patents/US20060049637?utm_source=gb-gplus-sharePatent US20060049637 - Power system for a telecommunication facility
