The CE approved Solar MPPT Charge Controller is designed with the maximum power point tracking technology. It has up to 95% of peak conversion, 99% of tracking efficiency, and three-stage charging with PWM output. Compare to PWM output, the Solar MPPT Charge Controller has more elaborate features: its voltage of the solar panel changes with different time of the day and the optimum voltage for battery charging changes during different charging stage. The Solar MPPT Charge Controller is capable of matching voltages and results in 3 - 3.5 times of efficiency while transferring power to battery bank. It allows a reduction in numbers of solar panel needed to reach its maximum efficiency. In addition, the Solar MPPT Charge Controller can also benefit Grid-Tied Power System by generating more electricity; it can improve your entire system and allows the system to produce better performance. Product Features - MCU fully digital-controlled MPPT solar charger - Complete protection system over short circuit, overload, low/high voltage, and over temperature - Large DC input voltage range - Buck-boost conversion