Overview#
The Generac SG070 is a 70 kW standby industrial natural gas generator set powered by Generac's own 4.5L turbocharged inline-4 spark-ignited engine at its highest output tuning. Rated at 88 kVA standby at 60 Hz, it is EPA certified for stationary emergency applications and demand response. The genset features the Generac Power Zone Pro controller with a 4.3-inch color touchscreen display.
Engine and alternator#
The Generac 4.5L (275 cubic inch) inline-4 turbocharged engine achieves 70 kW standby at 113 hp and 188 psi BMEP at 1,800 RPM — the highest BMEP in the 4.5L SG-series family. Key specifications include a 9.1:1 compression ratio, 4.5-inch bore, 4.25-inch stroke, electronic ignition, 5 main bearings, cast iron cylinder head and liners, forged steel crankshaft, and hydraulic roller lifters. The lubrication system uses a gear-driven oil pump with full-flow spin-on cartridge filtration and a 21-quart (20L) crankcase capacity.
The standard alternator is the Generac K0080124Y21, a 4-pole revolving-field design with Class H insulation on both rotor and stator. It features synchronous brushless excitation, full digital voltage regulation with plus or minus 0.25% steady-state accuracy, and total harmonic distortion below 5%.
Power ratings and fuel consumption#
At 277/480V three-phase and 0.8 power factor, the SG070 delivers 70 kW standby (105 A). Single-phase 120/240V at 1.0 pf produces 70 kW at 292 A.
Natural gas consumption at standby ratings: 928 scfh at 100% load, 697 scfh at 75%, 475 scfh at 50%, and 261 scfh at 25% load.
Physical dimensions#
The open set measures 92.9 x 39.9 x 46.0 inches (2,360 x 1,014 x 1,170 mm), weighing 1,967 to 1,978 lbs. All enclosure options (weather protected, Level 1, and Level 2 sound attenuated) share the 120.8 x 40.5 x 69.0 inch footprint.
Our service experience#
At 188 psi BMEP, the SG070 is the most aggressively tuned variant of the 4.5L platform. Exhaust temperature reaches 1,362 degrees F at rated output — the highest in the 4.5L family. Valve train condition checks and spark plug replacement at 1,000-hour intervals are critical. For demand response applications running significant annual hours, we recommend 250-hour oil change intervals and more frequent turbocharger inspections compared to standard standby duty.
