The BenQ Solar Data Logger BenQ Solar Data Logger BenQ Solar Data Logger BenQ Solar Data Logger is a gateway device that uses Power Line Communications (PLC) to collect status and performance data from AC Unison modules. Using broadband Internet, the Data Logger then forwards the collected data to the Solar Monitoring System at five minute intervals. When necessary, the Data Logger automatically downloads and installs enhancements, which can include defect fixes, to the software on the Data Logger or, on rare occasions, to the firmware on the micro-inverter.