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Stand by Generator

Small Stand by Generator - Up to 20kW - Air Cooled

Small Size
Single Phase
Up to 20kW

Stand by Generator Up to 20 kW
Generator Only
Small Size
Single Phase
Up to 20kW

Small Stand by Generator with Transfer Switch (ATS)
Generator with
Automatic Transfer
Switch (ATS)
Small Size
Single Phase
Up to 20kW

Small Stand by Generator with Load Center
Generator with
Load Center

Medium Stand by Generator - 21 to 50kW - Liquid Cooled

Medium Size
Single Phase
21 to 50kW

Liquid-Cooled Single Phase Generators
Click for NG
Click for Propane
Click for Diesel
Medium Size
3-Phase
120/240V
21 to 50kW

Liquid-Cooled Three Phase Generators
Click for NG
Click for Propane
Click for Diesel
Medium Size
3-Phase
120/208V
21 to 50kW

Liquid-Cooled Three Phase Generators
Click for NG
Click for Propane
Click for Diesel
Medium Size
3-Phase
277/480V
21 to 50kW

Liquid-Cooled Three Phase Generators
Click for NG
Click for Propane
Click for Diesel

Large Stand by Generator - 51 to 100kW

Large Size
Single Phase
51 to 100kW

Liquid-Cooled Single Phase Generators
Click for NG
Click for Propane
Click for Diesel
Large Size
3-Phase
120/240V
51 to 100kW

Liquid-Cooled Three Phase Generators
Click for NG
Click for Propane
Click for Diesel
Large Size
3-Phase
120/208V
51 to 100kW

Liquid-Cooled Three Phase Generators
Click for NG
Click for Propane
Click for Diesel
Large Size
3-Phase
277/480V
51 to 100kW

Liquid-Cooled Three Phase Generators
Click for NG
Click for Propane
Click for Diesel

Extra-Large Stand by Generator - Over 100kW

Extra-Large Size
Single Phase
Over 100kW

Liquid-Cooled Single Phase Generators
Click for NG
Click for Propane
Click for Diesel
Extra-Large Size
3-Phase
120/240V
Over 100kW

Liquid-Cooled Three Phase Generators
Click for NG
Click for Propane
Click for Diesel
Extra-Large Size
3-Phase
120/208V
Over 100kW

Liquid-Cooled Three Phase Generators
Click for NG
Click for Propane
Click for Diesel
Extra-Large Size
3-Phase
277/480V
Over 100kW

Liquid-Cooled Three Phase Generators
Click for NG
Click for Propane
Click for Diesel


Standby generators range in size from as little as 8kW to as much as 4000kW. Smaller units are normally air-cooled and single-phase (120/240 volt) machines that provide emergency backup power to a home. Larger models may serve commercial or marine applications. Each available size/phase/fuel/voltage can be selected by clicking on the appropriate box above. Here is a summary of the stand by generator styles offered by T-Rex:

Small Size (Up to 20kW) - Best for Home Emergency Backup Power

A small stand by generator is the perfect solution for automatic home backup. For simpler implementation, these generators are often available in a generator/automatic transfer switch package (Click to View Available Models). Generac also features several generator/transfer switch with built-in load center combinations (Click for Models). Small home-backup units provide the ultimate in convenience. The generator starts automatically if there is a loss of utility power - when utility power is restored, the generator shuts itself down. Our packaged generators can be operated on propane (LP/LPG) or natural gas (NG). After installation, transitioning between fuel types can be accomplished on the ground, usually with no technician.
  • Generator starts automatically when utility power loss detected
  • Generator shuts itself down when utility power has been restored
  • Can cover critical circuits for things like well pump, sump pump, furnace, fridge, lights, computer, tv, and more

Medium Size (21 to 50kW) - Best for Large Home or Business

These standby generators rely on liquid-cooled automotive-style motors to power more circuits and appliances than their small-sized siblings. Single-phase models of between 21 and 30 kW are excellent for backing up a large home or small business. Higher-kilowatt and three-phase models are found most often in commercial theaters.

Large Size (51 to 100kW) - Best for Business Applications

If you are a business owner, you understand the financial ramifications of lost power. When power is lost, so is productivity and response time. Installation of a high quality standby generator and ATS (automatic transfer switch) can help reduce the costs associated with a power loss. Particularly in those areas that endure frequent outages or suffer from an unreliable utility provider, investment in emergency backup power can pay for itself quickly.

Extra-Large Size (Over 100kW) - Best for Commercial Applications

These units, in concert if necessary, can provide sufficient standby power to backup any building - regardless of size.
Need Help? Call 866-613-9115
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Specials
(Winco WC6000HE) Honda Generators Power: Electric Start 5500W

(Winco WC6000HE) Honda Generators Power: Electric Start 5500W
$3,050.00
$2,592.50

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T-Rex Generators distributes products from many different standby and portable generator manufacturers at substantially discounted prices. These represented companies include: Asco automatic transfer switches, Briggs & Stratton generators, Winco generators, Generac Generators, GenTran transfer switches, Reliance Controls Transfer Switches, and Zenith automatic transfer switches. T-Rex also carries Honda powered generators which have the same time-tested Honda engines as the substantially more expensive Honda generator brand units.