In order to prevent a device serving as a load from being destroyed or causing an operation error while assuring an optimum operation voltage of a solar cell, and to stably, efficiently obtain power, a DC source system, in which a solar cell (1) and a DC source (3) are connected to an output terminal...http://www.google.ca/patents/US5986354?utm_source=gb-gplus-sharePatent US5986354 - DC source system with solar cell, and its operation method
