The APsystems ECU-R Energy Communication Unit collects and transfers performance data from compatible APsystems microinverters, providing real-time visibility into the solar array. Built-in Wi-Fi and Ethernet offer flexible network connections, while ZigBee communication links the gateway to the inverters. Key features Real-time inverter and module performance monitoring. Communicates with up to 30 inverters. Integrated 802.11g/n Wi-Fi and 10/100 Mbps Ethernet. 2.4 GHz ZigBee inverter communication. Compact, fanless enclosure for indoor installation. Technical specifications Manufacturer APsystems Model ECU-R Maximum communicating inverters 30 Wi-Fi 802.11g/n Ethernet 10/100 Mbps, auto-sensing and auto-negotiation Inverter communication ZigBee, 2.4 GHz Power supply 120-240 V AC, 50-60 Hz; adapter output 5 V DC, 2 A Power consumption 1.7 W USB interfaces Two 5 V DC, 0.5 A outputs Dimensions (W x H x D) 122 x 87 x 25 mm (4.8 x 3.4 x 0.98 in) Weight 150 g (0.33 lb) Operating temperature -20AdegC to 65AdegC (-4AdegF to 149AdegF) Cooling Natural convection; no fans Enclosure rating Indoor, NEMA 1 / IP20 Installation and compatibilityInstall indoors in a location suited to the gateway&';s operating conditions and communication range. Confirm compatibility with the specific APsystems microinverter model and monitoring configuration before ordering. The 30-unit limit refers to inverters, not solar modules.