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    AGM POWER SYSTEMS
    GENERAC GUARDIAN QUIETSCOURCE 18 - 45kW Liquid-Cooled

    QuietSource 20-45 kW Liquid-Cooled Standby Generators

    GUARDIAN QuietSource generators are ideal for applications that require ultra-quiet operation and exceptional fuel economy. With larger and more powerful liquid-cooled engines that run at 1800 RPM under full load and our exclusive Whisper-Test feature, QuietSource generators are the quietest in the industry. In addition, these larger engines achieve greater power output with less effort, resulting in significantly reduced fuel consumption both during exercise and under full load.

    QuietSource models also come standard with all aluminum enclosures for superior protection against salt air and other corrosive environments. Aluminum enclosures, combined with Guardian's superior paint system, keep QuietSource generators looking like new for years... even in coastal areas.

    • High Displacement, Low Speed, Liquid-Cooled Engine: Provides ultra-quiet operation and exceptional fuel economy
    • Gray, Aluminum Enclosure: Superior corrosion protection for coastal communities
    • Whisper-Test™: Low speed exercise feature makes QuietSource™ the quietest generators on the market
    • 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

    Model Number 5399 5388 5420 5421
    Rated Power (LP / NG) 18/18 kW 25/24 35/35 45/42
    Rated Amps @ 60 Hz
    240 V, 1Ø (LP / NG) 75/75 104.2/100 145.8/145.8 187.5/179.2
    Surge Watts - 240V, 1 Ø 31,920 37,920 54,000 77,040
    Surge Amps 133 158 225 321
    Engine (Generac OHVI) 1.6L, 4 Cyl. 2.4L/4 Cyl. 4.2L/V-6 4.2L/V-6
    Alternator RPM 1800 1800 1800 1800
    Enclosure Aluminum Aluminum Aluminum Aluminum
    Whisper Test Yes Yes Yes Yes
    Sound Level (dBA @ exercise) 63 54 60 60
    (dBA @ normal operation) 68 60 65 65
    Dimensions
    (L" x W" x H")
    62 x 29 x 34 77x34x45 77x34x45 77x34x45
    Automatic Transfer Switch (not included) RTS RTS RTS RTS
    Weight 845 1276 1683 1703
    Full Spec Sheet Spec Sheet Spec Sheet Spec Sheet Spec Sheet

    Note: Prior to choosing a generator size, always check the appliance or equipment manufacturer's power requirements. This will help to ensure power accommodations for items that cycle during operation.