Patents by Inventor Wolfgang Frees

Wolfgang Frees has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • String Failure Monitoring
    Publication number: 20120197557
    Abstract: A method of monitoring a plurality of strings of a photovoltaic system connected to a power inverter includes measuring current values from individual strings to the power inverter; determining a reference current value from the measured current values; and standardizing the measured current values to the reference current value. The method further includes and analyzing the standardized current values of individual strings within representative time periods by comparison with comparison values established for the individual strings. Based on the analysis a failure of an individual string is ascertained.
    Type: Application
    Filed: March 2, 2012
    Publication date: August 2, 2012
    Applicant: SMA Solar Technology AG
    Inventors: Gerd Bettenwort, Jens Klein, Marc Schaefer, Jochen Fischer, Wolfgang Frees, Matthias Victor