What is the solar panels open circuit voltage (no-load): refers to the plate in the absence of any load conditions, the direct use of multimeter voltage is connected to the positive and negative energy plate measured out is to open circuit voltage plate (also called no-load voltage). (i.e. Voc voltage the target value, if the Voc voltage quality in general can board the target value usually several volts, high voltage than the actual measured also can do the open-circuit voltage reference.)