U.S. Generator Sales Market Size, Share & Industry Analysis, By Power Rating (Below 75 kVA, 75-375 kVA, 375-750 kVA, and Above 750 kVA), By Application (Continuous Load, Peak Load, and Standby Load), By End-User (Mining, Oil & Gas, Construction, Residential, Marine, Manufacturing, Commercial, Telecom, and Others), By Product Type (Portable Generators, Standby Generators, Inverter Generators, and Industrial Generators), By Sales Channel (Direct Sales, Distributor/Dealer Network, and Online Sales), By Fuel Type (Diesel, Natural Gas, Gasoline, and Others), and Country Forecast, 2026-2034