Renogy 100 Watt 12 Volt Off Grid Solar Premium Kit with Eclipse Solar Panel and 20A 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 IP65 rated junction box provides complete protection against environmental particles and low pressure water jets