Generac 6551 22 kW Guardian Standby Generator and 200 Amp Switch

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Generac 6551 22 kW Guardian Standby Generator and 200 Amp Switch
The 22 kW Guardian Series home standby generator is the largest air-cooled home standby generator on the market. Not only does it deliver all the features and functionality customers have come to expect from the market-leading brand of home standby generators, but with an MSRP that is the lowest cost per kilowatt of any air-cooled home standby generator. Provides whole house coverage for many homes.


Your Guardian Series generator might have to get you through days—or weeks—without utility power. Generac’s OHVI engine, specifically designed for generator use, provides the reliability to power through the most severe outages. Best-in-class power quality with less than 5% total harmonic distortion means clean, smooth operation of your sensitive electronics and appliances. The next generation of intuitive controllers featuring a multilingual, two-line LCD text display with color-coded, backlit buttons. Third-party certified to NFPA standards to be installed as close as 18" from the home’s exterior wall, provided it is located away from doors, windows, and fresh-air intakes, and unless otherwise directed by local codes. When combined with a pre-wired transfer switch or Smart Switch, re-engineered connection points, and composite mounting pad that eliminates the need for a poured concrete base (unless specified by local codes), the Guardian Series 22 kW generator is easy to install. In areas with low natural gas pressure, the Guardian Series 22 kW generator can operate on natural gas pressures of only 3.5" of water column. Our durable powder-coat finish helps make the sturdy, all-weather aluminum enclosure corrosion resistant, making it ideal for coastal, salt-air climates. It’s also able to withstand 150 mph winds. Switch between natural gas and LP fuel in the field in a few seconds, without the need for any tools. All standby generators run a weekly test to ensure the system is running properly. Thanks to Quiet-Test, your Guardian Series home standby generator runs its self-test at a lower, quieter RPM than standard operation, and can be programmed to run weekly, bi-weekly, or monthly. Take advantage of Generac’s Mobile Link cellular remote monitoring system and check on your generator’s status using your computer, tablet or smartphone, even when you are away (sold separately). Generac’s customer care call center provides support any time of day or night, all year long. This model includes a 200 amp Generac Smart Switch. A smaller generator paired with a Generac Smart power management transfer switch provides whole-house coverage through a managed power solution. The process is simple - non-essential circuits are shed when the generator approaches maximum capacity to eliminate overload, then are cycled back on when essential circuits are satisfied. Generac Smart Switches are housed in an aluminum NEMA/UL Type 3R enclosure, with electrostatically applied and baked powder paint. The controller at the generator handles all the timing, sensing, exercising functions, and transfer commands. Smart switches are covered by a 5 year limited warranty.
  • 22kW Generator
  • Rated Maximum Continuous Power Capacity (LP): 22,000 Watts
  • Rated Maximum Continuous Power Capacity (NG): 19,500 Watts
  • Rated Voltage: 240
  • Rated Maximum Continuous Load Current – 240 Volts (LP/NG): 91.6/81.3
  • Total Harmonic Distortion: Less than 5%
  • Main Line Circuit Breaker: 100 Amp
  • Phase: 1
  • Number of Rotor Poles: 2
  • Rated AC Frequency: 60 Hz
  • Power Factor: 1.0
  • Battery Requirement (not included): Group 26R, 12 Volts and 525 CCA Minimum
  • Unit Weight (lb/kg): 526/238.6
  • Dimensions (L x W x H) in/mm: 48 x 25 x 29/1218 x 638 x 732
  • Sound output in dB(A) at 23 ft (7 m) with generator operating at normal load: 67
  • Sound output in dB(A) at 23 ft (7 m) with generator in Quiet-Test low-speed: 58
  • Exercise duration: 5 min
  • Type of Engine: GENERAC OHVI V-TWIN
  • Number of Cylinders: 2
  • Displacement: 999 cc
  • Cylinder Block: Aluminum w/ Cast Iron Sleeve
  • Valve Arrangement: Overhead Valve
  • Ignition System: Solid-state w/ Magneto
  • Governor System: Electronic
  • Compression Ratio: 9.5:1
  • Starter: 12 Vdc
  • Oil Capacity Including Filter: Approx. 1.9 qt/1.8 L
  • Operating rpm: 3,600
  • Fuel Consumption Natural Gas ft³/hr (m³/hr) 1/2 Load, Full Load: 184 (5.21), 281 (7.96)
  • Fuel Consumption Liquid Propane t³/hr (gal/hr) [l/hr] 1/2 Load, Full Load: 83 (2.16) [8.16], 127 (3.68) [13.99]
  • Whole House Transfer Switch
  • Model: RTSY200A3
  • Amps: 200
  • Load Transition Type (Automatic): 120/240, 1ø
  • Enclosure Type: Open Transition Service Rated
  • UL Rating: UL
  • Withstand Rating (Amps): 22000
  • Lug Range: 250 MCM - #6

6551 22kW Air-Cooled Standby Generator and Whole House 200 Amp SE Smart Switch.

Additional Information

Additional Information

Power Source LPG / NG