an inverter system includes inverting circuitry for inverting an input dc signal into a square wave or quasi - square wave ac signal across a resistance , and a controller for causing the inverting circuitry to invert the input dc signal into the ac signal . the dc signal is a dc voltage having a value that ranges from 24 - 32 volts dc . the ac signal is an ac voltage having a value that ranges from 115 - 230 volts ac rms .