The utility model belongs to the dc -to -ac converter field, the utility model relates to an inverter system, the system includes casing and operation element that the work shell is constituteed, the casing includes first room and second room, first indoor location has the air intake and turns into the direct current electric elements of alternating current, the second indoor location has noise filter, radiator fan and fin, the air intake, electric elements, noise filter, radiator fan and fin are arranged in proper order, the operation element still includes the controller, controller connection control radiator fan's work. The utility model provides a heat dissipation working strength of dc -to -ac converter big, can not the self -adjusting not enough and big problem of cooling air dust, have the function according to dc -to -ac converter temperature automatic adjustment radiator fan rotational speed, the improvement that air inlet is capable effectively obstructs dust and pollutant among the cooling air.