What are the different portable generator series (GP, XG, XC, XT, XD, and RS Series)?

The GP, XG, XC, XT, XD, and RS series generators, their different use cases and features

  • Mar 12, 2025
  • Knowledge

Title
What are the different portable generator series (GP, XG, XC, XT, XD, and RS Series)?
URL Name
What-are-the-differences-between-the-GP-XG-XC-XT-XD-and-RS-portable-generators

Public Answer

What are the differences between the GP, XT, XD, RS, and GP Inverter portable generators?

Generac offers a range of portable generators designed for various applications, from home backup to professional job sites. Each series boasts specific features tailored to meet distinct needs, clarifying what differentiates each in performance and utility. This guide highlights these differences to help users select the best generator for their requirements. 

Note: This article only offers a summary overview of commonly requested details regarding portable generator models and their features. It is not exhaustive or guaranteed to be completely accurate and up to date. For up-to-date information on a particular model, reference your generator's specification documentation by visiting our product information and documentation support page. In the event of any differences between the summary below and the specifications documentation, specifications documentation control. 


Environment 

This article applies to the portable generator series GP, XT, XD, RS, and GP Inverter series, which are currently available, as well as some of their distinct features and operational applications. 
 

Table of Contents 

Portable generator series 

 

Features

GP Series 

Purpose

GP series generators are ideal for various uses, including home emergency power, recreational activities, and job site applications. 

Available sizes 

3600w, 6500w, 8000w and 9200w

Key Features 

  • Generac OHV engine 
  • COsense® Technology (not available on all models)
  • Electric Start (not available on all models)

Note: GP series generators do not produce clean power (Low THD), which is necessary for sensitive electronics. For more information, see 
What Is Total Harmonic Distortion (THD)?
 

GP Dual-Fuel Series  

Purpose

GP Duel Fuel series generators can run on both gasoline and liquid propane. They are ideal for various uses, including home emergency power, recreational activities, and job site applications. 

Note: The GP Duel-Fuel series generators are only compatible with "BBQ propane tanks" or standard "20-lb propane tanks" with built-in regulators. They are not compatible with external regulators and large LP tanks. 
 

Available sizes

  • 7500w

Key Features

  • Dual Fuel (LP or gasoline)
  • Generac OHV engine 
  • COsense® Technology 
  • Electric start 

Note: GP Duel Fuel series generators do not produce clean power (Low THD), which is necessary for sensitive electronics. For more information, see What Is Total Harmonic Distortion (THD)?
 

High output GP Series  

Purpose 

High-output portable power with the efficiency of Electronic Fuel Injection. Powerful enough to start multiple 5-ton air conditioning units and can provide power for up to 16 circuits using Generac's HomeLink manual transfer switch kit. 

Available Sizes 

15,500w and 18,000w

Key Features 

  • Generac OHVI engine with automotive-style spin-on oil filter
  • 816cc engine with hydraulic lifters (No valve adjustments needed)
  • Electronic Fuel Injection 
  • Cosense® Technology 
  • TruePower™ technology
  • Electric start only (battery included)
  • Never flat wheels 

Note: Produces Clean Power (Low THD). For more information, see What Is Total Harmonic Distortion (THD)?
 

XT Series 

Purpose

Ideal for a versatile range of uses, it is specifically designed to deliver hassle-free operation. With a carburetor-free design, the XT series utilizes advanced electronic fuel Injection (EFI) technology. The EFI system enhances engine performance, efficiency, and ease of starting under various conditions. It is equipped with TruePower™ technology for clean power with low total harmonic distortion (THD), making it suitable for sensitive electronics. The series also features robust safety enhancements, including COsense™ Technology for critical protection against carbon monoxide. 

Key features

  • 459cc Generac EFI engine optimizes performance.
  • Cosense™ technology stops operation when harmful levels of CO are detected. (Not available on all models)
  • TruePower™ technology ensures stable and clean output for sensitive devices.
  • Electric start with a self-charging battery.
  • ControlGuard™ protects the control panel.
  • Large-capacity fuel tank with gauge for extended run times.
  • Durable 10" solid wheels and a fold-down locking handle for mobility and storage.

RS Series

Purpose

The RS offers streamlined operation and is optimized for easy start-up and reliable backup power for home use. 
 

Key features 

  • PowerDial™ integrates essential controls into a single easy-to-use dial.
  • Fold-down handle enhances portability and compact storage.
  • Heavy Duty 1¼" Hardened Steel Tube Cradle - designed to protect your generator, even under the roughest conditions.
  • Generac OHV Engine - features splash lubrication for long, reliable service.
  • Covered Outlets for added protection from the environment and rugged working conditions.
  • Large-capacity fuel tank with fuel gauge for extended running times. 
  • Heavy-duty, Never-flat Wheels.

XD Series  

Purpose

Best suited for job sites and agricultural applications requiring a durable and efficient diesel-power generator. This rugged, professional-grade diesel-powered portable generator featuring True Power™ Technology provides less than 6% total harmonic distortion for the clean, smooth operation of sensitive electronics, tools, and appliances. 
 

Key features

  • Efficient Yanmar LW Series industrial-grade engine with direct injection.
  • TruePower™ technology ensures stable and clean output for sensitive devices.
  • Large fuel tank, integrated lifting eye, and idle control.
  • Single-touch electric start.
  • Hour meter tracks maintenance intervals.

GP Inverter Series 

Purpose 

Inverter generators are popular with outdoor enthusiasts due to their fully enclosed design, dramatically reducing noise levels and preventing disturbing neighbors or surrounding wildlife. Inverter generators convert AC power into DC power and then back to AC power to create a cleaner wave of electricity. All inverter generators feature TruePower Technology, which provides clean, stable power that is ideal for sensitive electronics, tools, and appliances. 

Available Sizes

2500w, 3300w, 3500w, 3500w (open frame design)

Key Features 

  • Parallel operation ready 
  • TruePower™ Technology


Portable Generator Features Guide 

Cosense® Technology 
This feature protects against dangerous levels of carbon monoxide found in engine exhaust. Generac's advanced sensor technology detects high levels of CO faster than household detectors. If high levels of carbon monoxide are detected, the engine is automatically shut off and the user is alerted by a blinking red LED. 

Note: Cosense® Technology is NOT a substitute for in-home carbon monoxide detectors. 

True Power™ Technology 
Provides clean, smooth operation of sensitive electronics and appliances like a computer, TV, etc..
For more information, see the following articles

Idle Control 
It operates the engine at normal RPM when there is a load present and automatically reduces the engine to a lower RPM when a load is not present. This feature allows the generator to run quieter, use less fuel, and work only as hard as it needs to. 

PowerBar™
Provides a easy way to visually monitor the power usage by displaying the percentage of available power and used wattage. 

PowerDial™
This feature integrates the start, run, and stop operations in a straightforward dial, allowing for effortless operation. 

Dial positions:

  • Start: The unit fuel valve is opened, and the choke is positioned in the ON position. 
  • Run: The choke is positioned to the OFF position
  • Stop: The unit's fuel valve is moved to the off position. 

Hour Meter
This feature allows the user to track the hours of operation for scheduled maintenance awareness. 

  • CHG OIL message displays every 100 hrs. It starts flashing at 99 hrs. and disables at 101 hrs., providing a 2-hr. window to perform service 
  • The SVC message displays every 200 hours. It flashes one hour before and one hour after each 200-hour interval, providing a 2-hour window to perform service (Change oil, oil filter, air filter, and spark plug). 
  • In 'flash alert mode,' the maintenance message alternates with the elapsed time. The hours flash four times, then alternate with the maintenance message four times until the meter automatically resets. 
  • The 'hourglass icon' will flash when the engine is running. 

Electronic Fuel Injection (EFI)
This feature allows for a carburetor-free design, making the unit easier to start, more fuel efficient, and requiring less maintenance. Fuel is injected directly into the cylinder, and electronics are utilized to adjust the optimal fuel-to-air ratio. 
 

Ground Fault Circuit Interrupters (GFCI) Outlets
GFCI outlets constantly monitor electricity flowing in a circuit. If the current flowing through a circuit varies from what is returning, the GFCI switches power off, tripping the main circuit breaker. 
In the event of a ground fault, the GFCI will trip and stop the flow of electricity to prevent serious injury. 

Was this article helpful?
Upload Files


Need more help? Get in touch with our support team.


Contact Support