This rugged DC-AC inverter uses field proven, microprocessor controlled high frequency PWM technology to generate the required output with pure sine wave output. The design is based on mature technology with a track record in numerous applications. The input and output are filtered for low noise. The use of high frequency conversion enables a compact construction, low weight and high efficiency. Cooling is by conduction via baseplate. Additional cooling is achieved by natural convection through the cooling slots. All heat generating components are installed on aluminum heatsink blocks which are thermally connected to the base plate. This also provides exceptional mechanical ruggedness. Conformal coating provides protection against humidity and airborne contaminants. Full electronic protection, low component count, large design headroom and the exclusive use of components with established reliability contribute to a high MTBF. The unit is manufactured at our plant under strict quality control.