A PV system composed of sub-arrays, each having a group of PV cells that are electrically connected to each other. The shift in the resonance peak of the biosensor is indicative of the amount of material bound to the surface of the biosensor. An emergency knob formed of a luminous material is coupled to the open lever and accessible from inside the trunk room. Using the quality indication, it can be determined if a system’s error correction code scheme is capable of correcting data errors resulting from the defect. Camera parameters may be solved with reference to the object and references in the object. A dew point sensor in the return air path determines the moisture content of the material in the hopper, and when the dew point drops to a pre-set level, a diverter causes the return air flow to bypass the dessicant bed and to be re-supplied to the hopper without dehumidification.