Generac Portable Generator Guide
Generac portable generator guide: Compare GP, IQ & Tri-Fuel specs.
Generac Portable Generator Guide
Choosing a portable generator involves more than just matching wattage; it requires selecting a platform engineered for your specific environment. Generac categorizes its portable lineup into distinct series, each optimized for different duty cycles, fuel types, and power quality requirements.
Understanding the Generac Series Hierarchy
- GP Inverter Series: Designed for maximum portability and "clean" power. These units utilize a digital inverter module to maintain a stable sine wave (typically <3% Total Harmonic Distortion), making them the only choice for sensitive microprocessors in laptops, smartphones, and high-end appliances.
- GP Series (General Purpose): These are the versatile "workhorses." Featuring open-frame designs and high-displacement OHV engines, they are ideal for high-inertia loads like sump pumps, refrigerators, and power tools.
- XD Series (Extreme Duty): Specifically engineered for industrial environments. The XD series utilizes professional-grade diesel engines to provide superior fuel density and a significantly longer lifespan under continuous load.
- Multi-Fuel Series (Dual/Tri-Fuel): These units offer emergency flexibility by allowing the user to switch between Gasoline, Liquid Propane (LP), and Natural Gas (NG). This is essential for long-term outages where gasoline supply lines may be interrupted.
Generac Residential & Commercial Portable Series Comparison
GP Inverter Series
| Series & Model Number | Rated Watts | Surge Watts | Fuel Type | Start Type | Run Time (50% Load) |
| GP2500i (8251 / G0082512) | 2,200 W | 2,500 W | Gasoline | Recoil | 4.5 hrs |
| GP3300i (7153) | 2,500 W | 3,300 W | Gasoline | Recoil | 4.5 hrs |
iQ Series (Dual Fuel Inverter)
| Series & Model Number | Rated Watts | Surge Watts | Fuel Type | Start Type | Run Time (50% Load) |
| iQ5200DF (8945 / 8947) | 3,900 W | 5,200 W | Gas/LP | Electric | 13.5 hrs (Gas) |
GP Series (General Purpose)
| Series & Model Number | Rated Watts | Surge Watts | Fuel Type | Start Type | Run Time (50% Load) |
|---|---|---|---|---|---|
| GP6500 (7672 / 7680 / 7683) | 6,500 W | 8,125 W | Gasoline | Recoil/Elec | 10.5 hrs |
| GP15500EFI (7705) | 15,500 W | 19,300 W | Gasoline | Electric | 11 hrs |
Multi-Fuel Series (Dual/Tri-Fuel)
| Series & Model Number | Rated Watts | Surge Watts | Fuel Type | Start Type | Run Time (50% Load) |
|---|---|---|---|---|---|
| GP7500E DF (8011) | 7,500 W | 9,400 W | Gas/LP | Electric | 10 hrs (Gas) |
| GP9500E TF (8061 / 8063) | 9,500 W | 12,500 W | Gas/LP/NG | Electric | 9.5 hrs (Gas) |
XD Series (Industrial Diesel)
| Series & Model Number | Rated Watts | Surge Watts | Fuel Type | Start Type | Run Time (50% Load) |
|---|---|---|---|---|---|
| XD5000E (6864) | 5,000 W | 5,500 W | Diesel | Electric | 32.4 hrs |
Generac Industrial Mobile Solutions (MMG & MDG)
For large-scale construction, disaster recovery, and grid-level backup, Generac’s Mobile Series provides towable, high-capacity power. These units are built into sound-attenuated, weather-protected enclosures and feature multi-voltage selector switches to adapt to various jobsite requirements (120/240V 1-Phase up to 480V 3-Phase).
Technical Comparison: Generac Diesel Mobile Series (30 kW – 200 kW)
| Model Number | Rated Watts (kW) | Surge Watts (kVA) | Fuel Tank Capacity (Gal) | Run Time (Full Load) | Sound Level |
| MMG35DF4-STD | 30 | 35 | 100 | 31 hrs | 65 dB |
| MMG45IF4-STD | 37 | 45 | 100 | 27 hrs | 66 dB |
| MMG55DF4-STD | 46 | 55 | 100 | 23 hrs | 65 dB |
| MMG100DF4-STD | 80 | 100 | 165 | 24 hrs | 68 dB |
| MDG150DF4-STD | 120 | 150 | 28.5 | 39 hrs | 70 dB |
| MDG175DF4-STD | 140 | 175 | 310 | 24 hrs | 70 dB |
| MDG250DF4-STD | 200 | 250 | 28.5 | 24 hrs | 71 dB |
Key Technical Considerations for Your Selection
1. Running vs. Starting Watts
When sizing a generator, you must account for the "inrush current" required by motor-driven appliances.
- Running (Rated) Watts: The continuous power the generator can provide.
- Starting (Surge) Watts: The extra boost needed to start a motor. To estimate your needs, identify the highest starting wattage among your tools and add it to the total running wattage of all other connected devices.
2. COsense® Technology
Many modern Generac units feature COsense®, a safety system that automatically shuts down the generator if it detects dangerous levels of carbon monoxide. For indoor storage and jobsite safety compliance, this is a critical feature to look for in the "Model Number" specifications.
3. True Power™ Technology
For commercial applications where you are running sensitive diagnostic equipment or HVAC controllers, ensure the model includes True Power™ Technology. This proprietary Generac feature ensures voltage and frequency regulation that mimics utility-grade power, preventing premature wear on electrical components.
Product Compliance and Suitability
The product statements contained in this guide are intended for general informational purposes only. Such product statements do not constitute a product recommendation or representation as to the appropriateness, accuracy, completeness, correctness, or currentness of the information provided. Information provided in this guide does not replace the use by you of any manufacturer instructions, technical product manual, or other professional resource or adviser available to you. Always read, understand, and follow all manufacturer instructions.
