RNG-320D-H 320W Monocrystalline Solar Panel Electrical Data Maximum Power at STC* Optimum Operating Voltage (Vmp) Optimum Operating Current (Imp) Open Circuit Voltage (Voc) Short Circuit Current (Isc) Module Efficiency Maximum System Voltage Maximum Series Fuse Rating 320 W 33.30 V 9.61 A 40.10V 10.14 A 19.3% 1000 VDC UL 30 A Mechanical Data Solar Cell Type Monocrystalline (6.25 x 6.25 in) Number of Cells 120 [2 x (6 x 10)] 65.9 x 39.1 x 1.38 in (1675 x 992 x 35 mm) Dimensions Weight 40.8 lbs (18.