There is a lot of confusion between inverters and generators. All the inverters we sell are generators but not all generators are inverters. The term inverter refers to the way the generator processes the power. An inverter will take the A/C power converter it to D/C and then back to A/C. This helps clean the power and allows the generator to change rpm. The 22kw is not an inverter because it does not change the A/C power but it still has clean power because it uses a computer controller to regulate it.