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Generac 150kW Standby Generator | Liquid-Cooled Gaseous Engine | SCAQMD Compliant |Model RGRG15090C

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The Generac Protector® Series Standby Generator, model RGRG15090C, is Generac’s most powerful commercial generator, delivering a robust 150 kW at 1800rpm. Designed for critical power needs, this liquid-cooled gaseous engine generator ensures that your business operations remain uninterrupted during power outages. With advanced features, SCAQMD compliance, and durable construction, the RGRG15090C is the ultimate solution for maintaining reliable power in demanding commercial environments.

SKU PCG-10150 Categories , ,


Top-Tier Power Solution for Large-Scale Applications 

The Generac Protector® Series 150kW Standby Generator, model RG15090C, is engineered to deliver robust and reliable backup power for large homes, commercial properties, and critical applications. This generator is designed with advanced technology and durable construction to ensure continuous power supply during outages, maintaining essential systems and operations without interruption. 

Key Features: 

  • Mobile Link™ Remote Monitoring: Monitor your generator’s status from anywhere in the world using a smartphone, tablet, or PC. Access real-time updates on operating status and maintenance alerts for complete peace of mind. 
  • True Power™ Technology: Provides superior power quality with less than 5% total harmonic distortion (THD), ensuring smooth operation for sensitive electronics and appliances. 
  • Generac’s Liquid-Cooled 8.86L Gaseous Engine: Purpose-built for generator use, this engine offers reliable power with minimal maintenance. Assembled in the USA with both domestic and foreign parts, it guarantees high performance and durability. 
  • Quiet-Test™ Self-Test Mode: Runs at a lower RPM during self-tests for quieter and more fuel-efficient operation. Schedule tests weekly, bi-weekly, or monthly to ensure your generator is always ready. 
  • Durable Aluminum Enclosure: The RhinoCoat™ powder-coated finish ensures the aluminum enclosure is corrosion-resistant and suitable for all weather conditions, providing long-lasting durability. 
  • User-Friendly Power Zone® 410 Controller: Features a 128 x 64 graphical display with a heater, multi-lingual support, and comprehensive system status updates. Monitor voltage, current, power, oil pressure, coolant temperature, and more. 
  • 5-Year Limited Warranty: Enjoy long-term reliability and support with Generac’s comprehensive warranty. 

Innovative Design and Rigorous Testing: 

  • Solid-State, Frequency Compensated Voltage Regulation: Provides fast response to changing load conditions and maximizes motor starting capability with ±1% voltage regulation. 
  • Full Pressure Lubrication System: Ensures pressurized lubrication to vital bearings, enhancing performance, reducing maintenance, and extending engine life. 

Additional Benefits: 

  • Quick and Smooth Starting: The electronic ignition/spark advance ensures reliable and fast starts every time. 
  • Engine Protection: Features such as low oil pressure and high temperature shutdown safeguard the engine from damage. 
  • Voltage Regulation: Prevents harmful voltage spikes with ±1% regulation. 
  • Compliant and Safe: Integral sediment trap meets IFGC and NFPA 54 installation requirements. 
  • Easy Installation: Flexible fuel line connector listed ANSI Z21.75/CSA 6.27 for convenient gas supply connection. 
  • Quiet Operation: The enclosed critical grade muffler minimizes noise and enhances safety. 
  • Compact Design: The small footprint and attractive design allow for installation as close as 18 inches from a structure, fitting seamlessly into any environment. 


  • Model: RG15090C 
  • Power Output: 150 kW 
  • Fuel Options: Natural Gas or Liquid Propane 
  • Voltage: 120/240V Single Phase, 208/120V 3-Phase, 240/120V 3-Phase, 480/277V 3-Phase 
  • Phase: Configurable for Single or 3-Phase 
  • Noise Level: 80 dB(A) at normal load 
  • Engine: Generac Liquid-Cooled 8.86L V8 
  • Battery Type: Group 31, 925 CCA Minimum 
  • Fuel Usage: Natural Gas: 50.1 m³/h (1,769 ft³/h) at 100% load; Liquid Propane: 58.1 L/h (15.3 US gph) at 100% load 
  • Max Continuous Amps (Single Phase): 600A 
  • Weight: 3,009 lbs (1,365 kg) 
  • Dimensions: 132.7 x 40.7 x 64.1 inches (337 x 103.4 x 162.8 cm) 

Ensure your large home or commercial property remains powered and operational during any power outage with the Generac Protector Series 150kW Standby Generator, model RG15090C. With advanced features, durable construction, and remote monitoring capabilities, this generator provides reliable backup power when you need it most. 

Choose the Generac RG15090C for unmatched power and peace of mind. 

Additional information

Weight 3009 lbs
Dimensions 132.7 × 40.7 × 64.1 in
Fuel Type

Liquid Propane or Natural Gas

Oil Type

Check chart in manual

Oil Capacity (qt)


Battery Included


Battery Type

Group 31, 925 CCA

Battery Size


Engine Type

8-cyl V-type

Rated Engine Speed (RPM)


Quiet Test


Controller Type





34 kW –


144 kW

Max. Cont. Amps - 120/240 volts (LP)


Max. Cont. Amps (NG)


Sound Output at Normal Load - at 7 m

80 db

NG Consumption - 50% (m3/hr)


NG Consumption - 100% (m3/hr)


LP Consumption - 50% (l/hr)


LP Consumption - 100% (m3/hr)


LP Fuel Pressure - kPa (in. WC)

1.74-2.74 (7-11)

NG Fuel Pressure - kPa (in. WC)

1.74-2.74 (7-11)


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