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SYSTEM AND METHOD FOR USING A PHOTOVOLTAIC POWER SOURCE WITH A SECONDARY COOLANT REFRIGERATION SYSTEM

  • US 20090293523A1
  • Filed: 06/02/2008
  • Published: 12/03/2009
  • Est. Priority Date: 06/02/2008
  • Status: Abandoned Application
First Claim
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1. A secondary coolant refrigeration system powered primarily by a photovoltaic source and by an alternating current (AC) source as a backup, the secondary coolant refrigeration system having a pump for pumping secondary coolant fluid through a secondary coolant fluid loop, the system comprising:

  • a variable frequency drive for controlling the speed of the pump, the variable frequency drive comprising;

    drive circuitry configured to provide variable frequency power to the pump via an output interface;

    a first interface configured to receive power from the photovoltaic source;

    a second interface configured to receive power from the AC source; and

    a circuit configured to switch between providing power to the drive circuitry from the first interface and providing power to the drive circuitry from the second interface, wherein the circuit is further configured to cause the variable speed drive to be powered by the photovoltaic source when the power received from the first interface is adequate and by the AC source when the power received from the first interface is not adequate.

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