Apparatus and instruments for transforming, regulating or controlling electricity; apparatus and instruments for conducting, switching, and accumulating electricity, namely, electric conductors, electric switches, electric accumulators, solar cells, photovoltaic cells and modules, photovoltaic inverters, electronic switches for shutting down photovoltaic arrays, and photovoltaic systems that convert sunlight into electric and thermal energy; apparatus for converting electronic radiation into electric energy, namely, photovoltaic solar modules, DC/AC power converters for electricity; solar panels for converting electronic radiation into electric energy; photovoltaic solar modules for generating electricity; control apparatus for photovoltaic installations, namely, voltage and current monitoring modules; monitoring apparatus for electric converters, namely, voltage, current and frequency monitoring modules; electronic data loggers and data recording apparatus for photovoltaic installations for voltage, current strength and performance measurements; electronic data loggers for electric converters for voltage, current strength and performance measurements; photovoltaic installations for converting electronic radiation into electric energy comprised of photovoltaic solar panels and modules, photovoltaic inverters, control cabinets adapted for photovoltaic equipment, electrical switches, electrical switches for shutting off photovoltaic panels, electric control panels, feeder units in the nature of inverters, electronic devices for monitoring, controlling and shutting down photovoltaic arrays, and solar electric receivers; electric junction boxes