Description:  Start DIY your solar system. Reduce your electricity bill.  The second-generation SG micro-inverter adds mobile phone communication function, Let you monitor the working status of your inverter anytime and anywhere.This Smart On Grid system improves safety; maximizes solar energy harvest; increases system reliability, and simplifies solar system design, installation, maintenance , and management.     Specification:  INVERTER PARAMETER: Model: 1200W-WIFI / 600W-WIFI MPPT Voltage Range: 28V-50V.  Operation Voltage Range: 20V-55V.  Maximum Input Voltage: 55V.  Startup Voltage: 28V.  Maximum Input Power:4*300W. / 2*300W. Nominal Output Voltage: 120VAC / 230VAC.  Communication: WIFI With Cloud Monitoring.  1200W / 600W Grid Tie Micro Inverter with WiFi Communication.     Feature:  Use solar panel ONLY connect to this equipment.  This equipment is ON-GRID Microinverter, The AC output must be connected to the home grid.  Solar panel open circuit voltage ≤55V (Voc).  Solar panel power cannot exceed 1200W(4X300W). /600W(2X300W). The positive and negative poles of the solar panel cannot be reversed. If you extend the solar panel cable. You need to be careful about this problem.