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Generac 48kW Standby Generator | Liquid-Cooled Gaseous Engine |Model RG04845

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The Generac Standby Generator Model RG04845 is your go-to solution for reliable and robust backup power. With a powerful 48kW output and running at 1800rpm, this generator ensures that your entire home or commercial business remains powered during outages. The aluminum enclosure adds durability, making it suitable for all weather conditions. Designed to power all your appliances, electronics, pumps, and motors, the RG048 allows you to live comfortably and keep your business operations uninterrupted.

SKU PCG-10048 Categories , ,


Powerful, Reliable, and Efficient Backup Power Solution 

The Generac Protector® Series 48kW Standby Generator, model RG04845, is designed to provide robust and reliable backup power for your home or business. With advanced features and a durable design, this generator ensures uninterrupted power supply during outages, keeping your essential systems and appliances running smoothly. 

Key Features: 

  • Mobile Link™ Remote Monitoring: Stay connected and monitor your generator’s status from anywhere using a smartphone, tablet, or PC. Access real-time updates on operating status and maintenance alerts, ensuring complete peace of mind. 
  • True Power™ Technology: Delivers superior power quality with less than 5% total harmonic distortion (THD), ensuring smooth operation for sensitive electronics and appliances. 
  • Generac’s Liquid-Cooled 4.5L Gaseous Engine: Built specifically for the demands of generator use, this engine provides 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/2,000 Hour 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: RG04845 
  • Power Output: 48 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: 64 dB(A) at normal load, 58 dB(A) in Quiet-Test™ mode 
  • Engine: Generac Liquid-Cooled 4.5L Inline 4-Cylinder 
  • Battery Type: Group 27F, 725 CCA Minimum 
  • Fuel Usage: Natural Gas: 14.0 m³/h (494 CFH) at 100% load; Liquid Propane: 21.7 L/h (5.7 US gph) at 100% load 
  • Max Continuous Amps (Single Phase): 200A 
  • Weight: 1,781 lbs (808 kg) 
  • Dimensions: 83.4 x 35.3 x 46.2 inches (212.1 x 88.9 x 116.8 cm) 

Ensure your home or business remains powered and comfortable during any power outage with the Generac Protector Series 48kW Standby Generator, model RG04845. With advanced features, durable construction, and remote monitoring capabilities, this generator provides reliable backup power when you need it most. 

Choose the Generac RG04845 for unmatched power and peace of mind. 

Additional information

Weight 1781 lbs
Dimensions 83.5 × 35 × 46 in
Fuel Type

Liquid Propane or Natural Gas

Oil Type

Check chart in manual

Crankcase Capacity (qt/l)


Battery Included


Battery Type

Group 27F (48kW), 725 CCA

Battery Size


Engine Type

4-cyl In-line

Rated Synchronous rpm


Quiet Test


Controller Type





29 kW –



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


Max. Cont. Amps (NG)


Sound Output in 7m - in Exercise Mode

68 db

NG Consumption - 50% (m3/hr)


NG Consumption - 100% (m3/hr)


LP Consumption - 50% (l/hr)


LP Consumption - 100% (l/hr)


LP Vapor Pressue (in. WC)

7 to 14

NG Pressure (in. WC)

3.5 to 14


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