A backup power system is connected in parallel to a load which is powered via a power line connecting that load to a main power source, such as a utility. The backup system includes a generator/condenser unit that is coupled to a flywheel unit to maintain the flywheel of that flywheel unit rotating at...http://www.google.ca/patents/US7042108?utm_source=gb-gplus-sharePatent US7042108 - Backup power system
