9 Commutators; computer peripheral devices, namely, data loggers, inverters and data monitoring systems comprising CPU, RAM, flash memory for data storage, data transfer interface and LED indicator; computer programs downloadable via the Internet for updating photovoltaic inverter firmware; computer programs recorded on data media for recording the DC output power, AC input power, inverter efficiency, system performance, sunshine, module temperature and inverter alarm message designed for use in smart grid systems and photovoltaic systems; electric converters; current rectifiers; electric installations for the remote control of industrial operations; electronic intercommunication apparatus, namely, data loggers, inverters and data monitoring systems comprising DC output power, AC input power, inverter efficiency, system performance, sunshine, module temperature and inverter alarm message; electrical inverters; measuring apparatus, namely, data loggers, inverters and data monitoring systems for measuring DC output power, AC input power, inverter efficiency, system performance, sunshine, module temperature, inverter alarm message and the monitoring systems comprising CPU, RAM, flash memory for data storage, data transfer interface and LED indicator; electric measuring devices, namely, data loggers, inverters and data monitoring systems for measuring DC output power, AC input power, inverter efficiency, system performance, sunshine, module temperature, inverter alarm message and the monitoring systems comprising CPU, RAM, flash memory for data storage, data transfer interface and LED indicator; electric monitoring apparatus, namely, data loggers, inverters, data monitoring systems for monitoring DC output power, AC input power, inverter efficiency, system performance, sunshine, module temperature, inverter alarm message and the data monitoring systems comprising CPU, RAM, flash memory for data storage, data transfer interface and LED indicator; computer monitors for use with computer hardware; monitors for computer programs, namely, a data monitoring program and a data management program; solar batteries