9 PHOTOVOLTAIC POWER GENERATION SYSTEMS COMPRISING OF PHOTOVOLTAIC CELLS AND PHOTOVOLTAIC SYSTEMS, COMPRISED OF PHOTOVOLTAIC MODULES, POWER INVERTERS, GRID-TIE SWITCHES, FIELD COMBINER BOXES, SAFETY CIRCUITS, MONITORING INSTRUMENTS, MOUNTING RACKS AND HARDWARE, ELECTRICAL WIRE AND CONDUIT, AND/OR SUN-TRACKING EQUIPMENT AND MOUNTS; ELECTRODES FOR PHOTOVOLTAIC CELLS AND PHOTOVOLTAIC MODULES; ACCESSORIES FOR PHOTOVOLTAIC CELLS AND PHOTOVOLTAIC MODULES, NAMELY, INVERTORS, CONVERTERS, ELECTRIC POWER METERS, TRANSFORMERS, COMPUTERS, COMPUTER PROGRAMS FOR USE IN PHOTOVOLTAIC POWER GENERATION SYSTEMS IN THE FIELD OF ELECTRIC POWER GENERATION; MEASURING AND TESTING INSTRUMENTS AND APPARATUS, NAMELY, PHOTOVOLTAIC CELLS AND PHOTOVOLTAIC MODULES FOR PERFORMANCE TESTING FOR EVALUATING THE POWER AND EFFECTIVITY OF PHOTOVOLTAIC CELLS AND PHOTOVOLTAIC MODULES, LIGHT SOURCES SIMULATING NATURAL AND CONCENTRATED SUN RADIATION