Abstract: An improved DC to AC electrical inverter has a new and improved method and apparatus with forced air ventilation cooling that significantly increases sustainable AC power output. The methods include the steps of forcing an air flow out of the inverter enclosure and over an external heat sink, and forcing an air flow through a special power transformer between the windings and the core. The apparatus has at least one fan, an air outlet and structure for guiding and directing a forced air flow to and over an external heat sink for the power switches. A structure to continuously force cooling air through the power transformer is also provided.

Abstract: A DC to AC power inverter has an improved construction providing for substantially improved thermal disipation, reliability, and efficiency; the inverter has a unitary combination frame and heat diffuser with a pair of opposed U-shaped sections at right angles to each other and with a common base, a cover, a transformer, a primary internal heat sink inside of and on the frame, a plurality of power switches fastened on the internal heat sink, a printed circuit board fastened to and spaced from the heat sink with leads from the switches connected to the board, the transformer is fastened onto the frame in heat exchange relationship and part of the coil extends through the frame into an air passageway. All of the wiring access is on a field wiring end and the opposite end is a control end with the switches and circuit board; an improved arrangement of components and leads provides discrete separation of the high and low voltage components and leads.