The invention discloses a solar photovoltaic grid-connected inverter, which includes a power circuit and a control circuit. The power circuit includes a DC/DC unit, a DC/AC unit, and a filter unit; Collect digital and/or analog signals in the system, control the power devices in the power circuit after completing the corresponding operations, and dynamically track the maximum power point of the solar cell array to adjust the working point of the solar cell array. The invention also discloses a solar inverter air conditioner system, which includes a solar cell array, a DC boost module, a solar photovoltaic grid-connected inverter, and a DC inverter air conditioner. The grid-connected inverter is connected between the DC step-up module and the utility grid. The invention realizes that the air conditioner is jointly driven by the solar energy and the mains power, and when the air conditioner is idle or the solar energy is surplus, the electric energy can be fed back to the city network.