Renogy 300 Watt 12 Volt Off Grid Solar Premium Kit with Eclipse Solar Panel and 40A MPPT Rover Controller Monocrystalline panels come with high-efficiency cells that help increase module efficiency. Module efficiency: Eclipse 100W Monocrystalline: 18.35% Bypass diodes minimize power drop caused by shade and ensure excellent performance in low-light environments Rover charge controller brings peak conversion efficiency of 98%, high Tracking efficiency of 99% Extra thick anti-reflective, high transparency, low iron-tempered glass with enhanced stiffness and impact resistance EL tested solar modules; no hot-spot heating guaranteed Corrosion-resistant aluminum frame for extended outdoor use, allowing the panels to last for decades TPT back sheet ensures smooth performance over a long period of time IP65 rated junction box provides complete protection against environmental particles and low pressure water jets 4-Stage battery charging process for a rapid, efficient, and safe battery charging RS-232 port compatible for extra features Compatible with Renogy Bluetooth Module and Renogy BT APP for remote monitoring Pre-drilled holes on the back of the panel allow for fast mounting and securing Comes equipped with an MC4 Inline fuse and ANL fuse components for protecting your charge controller and battery