GUARDIAN® is now doing to the commercial market what it has already done to the residential market… making standby power reliable, yet affordable. Protect your revenue stream by investing in a GUARDIAN Elite™ commercial automatic standby generator. Our GUARDIAN Elite generators are ideal for a broad range of enterprises, including restaurants, convenience stores, supermarkets, banks, fitness centers, hotels, and retail outlets.
Three-phase models range from 20-150 kW and single-phase models from 60-150 kW. They run on either natural gas or LPV, feature automotive style, liquid-cooled engines, GUARDIAN’s exclusive Whisper-Test™ feature and a corrosion-resistant aluminum enclosure option.
Whisper Quiet Operation
GUARDIAN’s exclusive patent-pending Whisper-Test low speed exercise feature makes our GUARDIAN Elite products the quietest liquid-cooled generators on the market. Whisper-Test reduces noise by 50% during the generator’s weekly self-test cycle allowing for near silent operation that satisfies all known sound ordinances.
Value Priced
During a utility outage, a GUARDIAN Elite will protect your revenue stream and prevent expensive losses by keeping your business… in business. Not only are our products engineered for reliability and long life, our volume production and short lead times make GUARDIAN Elite products an even better value.

  • Liquid-Cooled Engine: Produces more electricity for longer outages
  • Whisper-Test™: Patent-pending, self-test feature makes the GUARDIAN Elite 50% quieter during the generator’s weekly self-test cycle
  • Aluminum Enclosure: Corrosion-resistance for coastal communities (60 kW and higher)
  • Longest Life Expectancy in the Industry: Over 3,000 hours of run time
  • Superior Paint: Tough, textured powder coat paint finish for unmatched durability and all weather protection
  • UL Listed: For safety and certified power ratings
  • Clean Burning Fuel: Natural gas or LPV

Generator Set

/ /
/ 20-45 kW /
/ / /
/ 60-80 kW /
/ / /
/ 100-150 kW /
Model Number / QT02016 / QT02516 / QT03524 / QT04524
Rated Power LP (kW) / 20 / 25 / 35 / 45
Rated Power NG (kW) / 20 / 25 / 35 / 43
Amps @ 208V, 3Ø / 70 / 87 / 122 / 156
Amps @ 480V, 3Ø / n/a / n/a / 53 / 68
Voltage @ 60 Hz / 120/208 / 120/208 / 120/208, 277/480 / 120/208, 277/480
Phase / Three / Three / Three / Three
Frequency / 60 Hz / 60 Hz / 60 Hz / 60 Hz
Engine/Alternator RPM / 3600/3600 / 3600/3600 / 3600/3600 / 3600/3600
Engine / 1.6L OHC 4 cyl. / 1.6L OHC 4 cyl. / 2.4L OHC 4 cyl. / 2.4L OHC 4 cyl.
Fuel Consumption LP
(cu.ft./hr.)/(gal./hr.) / 125 (3.44) / 175 (4.81) / 222.3 (6.1) / 286 (7.86)
Fuel Consumption NG (cu.ft./hr.) / 315 / 437 / 560 / 720
EPA/CARB Certified / Yes / Yes / No / No
Fuel / Natural Gas
LP Vapor / Natural Gas
LP Vapor / Natural Gas
LP Vapor / Natural Gas
LP Vapor
Engine Cooling / Liquid / Liquid / Liquid / Liquid
Controls / R-Series / R-Series / R-Series / R-Series
UL 2200 (US and Canada) / Yes / Yes / Yes / Yes
Sound Output dB(A) at 23 ft. with generator operating at full load / 72 / 73 / 71 / 72
Sound Output dB(A) at 23 ft. with generator in WhisperTest™ low speed exercise mode / 62 / 63 / 57 / 58
Main Line Circuit Breaker / 80 Amp / 100 Amp / 150, 60 Amp / 175, 80 Amp
Aluminum Enclosure Option / Yes / Yes / Yes / Yes
Dimensions (L" x W" x H") / 71 x 29.5 x 36 / 71 x 29.5 x 36 / 77 x 33.5 x 45 / 77 x 33.5 x 45
Unit Wt. (lbs.) (steel/aluminum) / 784/694 / 794/704 / 1393/1276 / 1414/1297

Controls and Transfer Switch

/ /
/ R-Series Digital Controller /
/ / /
/ H-100 Digital Controller /
/ / /
/ Transfer Switch /
7 LED Indicator Lights / Standard
High Temperature Shutdown / Standard
Low Coolant Level Shutdown / Standard
Automatic Voltage Regulator with Over-voltage Protection / Standard
  • Voltage Regulation (at steady state from no load to 100% load
/ ± 1.0 %
  • Frequency Regulation (at steady state from no load to 100% load)
/ ± 0.5%
Engine Start Sequence / Cyclic Cranking: Initially 15 sec. on, then 7 sec. rest, 7 sec. on. 90 sec. maximum duration
Safety Fuse / Standard
Starter Lockout / Starter cannot re-engage until 5 sec. after engine has stopped
2 Amp Battery Charger / Standard
Engine Warm-up / 10-15 seconds
Engine Cool-down / 1 minute
Mode Switch
  • Auto Position
/ Utility Failure / 7 day exerciser
  • Off Position
/ Stops unit. Power is removed. Control and charger still operate.
  • Manual/Test Position
/ Start with starter control, unit stays on. If utility fails, transfer to load takes place
Automatic Weekly Exerciser with Selectable Low Speed Exercise / Standard