MPPT PV controller with high capability and step-down buck circuit is solar power generation equipment,solar energy input use the calculation of MPPT(the maximum power point tracking). Take full advantage of photovoltaic power generation, increase at least 12 percent of generating efficiency.Due to use the component of power conversion,it can also charge the battery of low degree voltage even photovoltaic input voltage within 0-450v( able to charge 48v/110v/220v etc).It can be parallel connection with Flexible configuration.