U.S. Generator Sales Market Size, Share & COVID-19 Impact Analysis, By Power Rating (Below 75 kVA, 75-375 kVA, 375-750 kVA, Above 750 kVA), By Fuel Type (Diesel, Gas, Others), By Application (Continuous Load, Peak Load, Standby Load), By End-User (Mining, Oil & Gas, Construction, Residential, Marine, Manufacturing, Pharmaceuticals, Commercial, Telecom, Others) and Forecast, 2023 – 2030