This is the 50-150 watts power inverter circuit diagram. The inverter capable to handle output loads range of 50W to 150W, it depended to the transformer used in this circuit design. This circuit will provide a fairly stable Square Wave output voltage. The outout frequency of operation is determined by the 220uF feedback capacitor. Currently, the output frequency is about 60 Hz.
Additional transistors can be further paralleled to obtain more higher power. Or for low power output, you may have to remove two transistor (a couple). Additionally, other NPN transistor types can be used as subtitude transistor.
50-150 watts power inverter circuit source: telus.net