Features:  1. IP65 waterproof exterior (mounted on the bottom of the solar panel).  2. AC data monitoring screen.  3. Built-in powerful Maximum Power Point Tracking (MPPT).  4. Suitable for 2X250W-300W 36V solar panels (Vmp30-39V; Voc36-50V).  5. Made of aluminum alloy for better heat dissipation.  6. Support single phase or three phase connection.  7. simple wiring.  8. high-precision phase detection; over and under voltage protection; over and under frequency protection; islanding protection. Parameter.     Specification:  Input parameters: 600W.  Maximum input power: 2×300Watt.  Recommended solar panel: power 2×300W, open circuit voltage 36-50VOC.  Solar panel open circuit voltage range: 36-50 VOC.  Peak power tracking voltage: 22-45V.  Minimum/maximum starting voltage: 22-50V.  Maximum DC short circuit current: 40A.  Maximum input operating current: 27.2A.  Output parameters: @230VAC.  Output peak power: 600 watts.  Rated output power: 550 watts.  Rated output current: 2.39A.  Rated voltage range: 190-260VAC.  Rated Frequency Range: 47-52.5Hz/57-62.5Hz.  Power Factor: >99%.  Number of connected units per string: 10 units (single phase).  Output Efficiency: @230VAC.  Net weight: 1.63 kg.  Finished size: 283*200*41.6mm.  Packing size: 335*240*115mm