Generac Guardian Series Residential Standby Generators (16/20/22 kW)

The Generac Guardian Series offers reliable air-cooled gas engine standby generators designed for residential use, providing essential power during outages.

Key Features & Inclusions

True Power™ Electrical Technology: Delivers utility-quality power with less than 5% Total Harmonic Distortion, suitable for sensitive electronics and micro-chip based appliances.
Two-Line LCD Multilingual Digital Evolution™ Controller: Supports English, Spanish, French, and Portuguese for easy operation and status monitoring.
Transfer Switch Options: Available with a 100 Amp Pre-Wired Switch or a 200 Amp Service Rated Switch (details on page 4).
Electronic Governor: Ensures stable engine speed and power output.
External Main Circuit Breaker, System Status & Maintenance Interval LED Indicators: Provide clear operational status and maintenance alerts.
GFCI Duplex Outlet: For convenient temporary power needs.
Sound Attenuated Enclosure: Offers quiet operation and protection against weather, withstanding winds up to 150 mph.
Flexible Fuel Line Connector: Accommodates natural gas or LP gas.
Composite Mounting Pad: Eliminates the need for a concrete pad in many installations.
5 Year Limited Warranty: Provides peace of mind.
Installation Flexibility: Can be installed as close as 18 inches (457 mm) from a building (subject to local codes and safety requirements).

Generac's Commitment to Quality

Generac emphasizes Innovative Design & Prototype Testing, along with rigorous reliability, environmental, destruction, and life testing to meet CSA, NEMA, EGSA, and other standards. This ensures superior performance and confidence in their power systems.

Solid-State, Frequency Compensated Voltage Regulation is standard, providing optimized response to load changes and maximum motor starting capability with digital voltage regulation at ±1%.

Single Source Service Response is available through Generac's extensive dealer network for parts and service.

Generac also manufactures its own Transfer Switches, ensuring total system compatibility.

Test Criteria Met:

✔️ Prototype Tested
✔️ NEMA MG1-22 Evaluation
✔️ System Torsional Tested
✔️ Motor Starting Ability

Generator Specifications

Model	006459-0, 006461-0, 006462-1, 006721-0 (16 kW)	006729-1, 006730-0 (20 kW)	006551-1, 006552-0 (22 kW)
Rated Maximum Continuous Power Capacity (LP)	16,000 Watts*	20,000 Watts*	22,000 Watts*
Rated Maximum Continuous Power Capacity (NG)	16,000 Watts*	18,000 Watts*	19,500 Watts*
Rated Voltage	240	240	240
Rated Maximum Continuous Load Current - 240 Volts (LP/NG)	66.6/66.6	83.3/75	91.6/81.3
Total Harmonic Distortion	Less than 5%	Less than 5%	Less than 5%
Main Line Circuit Breaker	65 Amp	90 Amp	100 Amp
Phase	1	1	1
Number of Rotor Poles	2	2	2
Rated AC Frequency	60 Hz	60 Hz	60 Hz
Power Factor	1.0	1.0	1.0
Battery Requirement (not included)	Group 26R, 12 Volts and 525 CCA Minimum	Group 26R, 12 Volts and 525 CCA Minimum	Group 26R, 12 Volts and 525 CCA Minimum
Unit Weight (lb/kg)	513/232.7 (Steel); 448/203.2 (Aluminum)	516/234.1	526/238.6
Dimensions (L x W x H) in/mm	48 x 25 x 29 / 1218 x 638 x 732	48 x 25 x 29 / 1218 x 638 x 732	48 x 25 x 29 / 1218 x 638 x 732
Sound output in dB(A) at 23 ft (7 m) (normal load)**	66	66	67
Sound output in dB(A) at 23 ft (7 m) (Quiet-Test™ low-speed exercise)**	60	60	58
Exercise duration	5 min	5 min	5 min

Engine Specifications

Feature	GENERAC OHVI V-TWIN	GENERAC OHVI V-TWIN	GENERAC OHVI V-TWIN
Type of Engine	GENERAC OHVI V-TWIN	GENERAC OHVI V-TWIN	GENERAC OHVI V-TWIN
Number of Cylinders	2	2	2
Displacement	992 cc	999 cc	999 cc
Cylinder Block	Steel	Aluminum w/ Cast Iron Sleeve	Overhead Valve
Valve Arrangement	Overhead Valve	Overhead Valve	Overhead Valve
Ignition System	Solid-state w/ Magneto	Solid-state w/ Magneto	Solid-state w/ Magneto
Governor System	Electronic	Electronic	Electronic
Compression Ratio	9.5:1	9.5:1	9.5:1
Starter	12 Vdc	12 Vdc	12 Vdc
Oil Capacity Including Filter	Approx. 1.9 qt/1.8 L	Approx. 1.9 qt/1.8 L	Approx. 1.9 qt/1.8 L
Operating rpm	3,600	3,600	3,600

Fuel Consumption

Natural Gas

Load	16 kW	20 kW	22 kW
1/2 Load (ft³/hr / m³/hr)	193 (5.47)	205 (5.8)	184 (5.21)
Full Load (ft³/hr / m³/hr)	312 (8.83)	308 (8.72)	281 (7.96)

Liquid Propane

Load	16 kW	20 kW	22 kW
1/2 Load (ft³/hr / gal/hr) [l/hr]	72.4 (1.99) [7.53]	75.6 (2.08) [7.87]	83 (2.16) [8.16]
Full Load (ft³/hr / gal/hr) [l/hr]	130 (3.19) [13.53]	140 (3.85) [14.57]	127 (3.68) [13.99]

Note: Fuel pipe must be sized for full load. Required fuel pressure to generator fuel inlet at all load ranges - 3.5-7" water column (7-13 mm mercury) for natural gas, 10-12" water column (19-22 mm mercury) for LP gas. For Btu content, multiply ft³/hr x 2500 (LP) or ft³/hr x 1000 (NG). For Megajoule content, multiply m³/hr x 93.15 (LP) or m³/hr x 37.26 (NG).

Control Features

2-Line Plain Text Multilingual LCD Display: Simple interface for ease of operation.
Mode Buttons: Auto, Manual, Off.
Ready to Run/Maintenance Messages: Provides status and alerts.
Engine Run Hours Indication: Standard.
Programmable start delay: Between 2-1500 seconds.
Utility Voltage Loss/Return to Utility Adjustable: Includes brownout setting.
Exerciser/Exercise Set Error Warning: Standard.
Run/Alarm/Maintenance Logs: Stores up to 50 events.
Engine Start Sequence: Cyclic cranking (16 sec on, 7 sec rest, 90 sec max duration).
Starter Lock-out: Prevents re-engagement for 5 seconds after engine stops.
Smart Battery Charger: Standard.
Charger Fault/Missing AC Warning: Standard.
Low Battery/Battery Problem Protection: Standard.
Automatic Voltage Regulation: With over and under voltage protection.
Under-Frequency/Overload/Stepper Overcurrent Protection: Standard.
Safety Fused/Fuse Problem Protection: Standard.
Automatic Low Oil Pressure/High Oil Temperature Shutdown: Standard.
Overcrank/Overspeed (@ 72 Hz)/rpm Sense Loss Shutdown: Standard.
High Engine Temperature Shutdown: Standard.
Internal Fault/Incorrect Wiring Protection: Standard.
Common External Fault Capability: Standard.
Field Upgradable Firmware: Standard.

* Maximum wattage and current are subject to and limited by such factors as fuel Btu/megajoule content, ambient temperature, altitude, engine power and condition, etc. Maximum power decreases about 3.5 percent for each 1,000 feet (304.8 meters) above sea level; and also will decrease about 1 percent for each 6 °C (10 °F) above 16 °C (60 °F).

Switch Options

Pre-wired Features (Available on Steel 16 kW models only)

Electrically operated, mechanically-held contacts for fast, positive connections.
Rated for all classes of load, 100% equipment rated, both inductive and resistive.
2 pole, 250 VAC contactors.
30 millisecond transfer time.
Dual coil design.
Main contacts are silver plated or silver alloy to resist welding and sticking.
NEMA 1 (indoor rated) enclosure.
Includes pre-wired 30-foot (9.1 meter) whip and 2-foot (0.61 meter) color-coded whip.

Model 006461-0 (16 kW) - Pre-wired Switch

No. of Poles	2
Current Rating (Amps)	100
Voltage Rating (VAC)	120/240, 1Ø
Utility Voltage Monitor (Fixed)	Pick-up: 80%, Dropout: 60%
Return to Utility*	approx. 15 sec.
Exercise weekly for 12 minutes*	Standard
Total of Pre-wired Circuits	16 (including various 120V and 240V circuits)
Circuit Breaker Protected Available RMS Symmetrical Fault Current @ 250 Volts	10,000

*Function of Evolution Controller

Service Rated Switch Features

Electrically operated, mechanically-held contacts for fast, clean connections.
Rated for all classes of load, 100% equipment rated, both inductive and resistive.
2 pole, 250 VAC contactors.
Service equipment rated, dual coil design.
Rated for both aluminum and copper conductors.
NEMA/UL 3R aluminum outdoor enclosure.
Main contacts are silver plated or silver alloy to resist welding and sticking.

Models 006462-1 (16 kW)/006729-1 (20 kW)/006551-1 (22 kW) - Service Rated Switch

No. of Poles	2
Current Rating (Amps)	200
Voltage Rating (VAC)	120/240, 1Ø
Utility Voltage Monitor (Fixed)	Pick-up: 80%, Dropout: 60%
Return to Utility*	approx. 13 sec.
Exercise weekly for 12 minutes*	Standard
Enclosure Type	NEMA/UL 3R
Withstand Rating (Amps)	22,000
Lug Range	250 MCM - #6