20kW Generators

50 products

Top Sellers — Market Front-Runners The same Tier-1 lines as the big national players · live PES pricing
Top SellerTrina Solar Vertex N 600W N-Type TOPCon Commercial ModuleTrina Solar Trina Solar Vertex N 600W N-Type TOPCon Commercial Module $158.06 $0.26/W · 600WTop SellerZNshine 400W ZXM7-SH108-400/M All Black Monocrystalline Solar PanelZNShine ZNshine 400W ZXM7-SH108-400/M All Black Monocrystalline... $136.86 $0.34/W · 400WTop SellerZnshine 405W Black ON Black 108 HALF-CELL MONO Solar Panel - ZXM7-SH108-405/MZNShine Znshine 405W Black ON Black 108 HALF-CELL MONO Solar Pa... $147.61 $0.36/W · 405WLONGi Hi-MO X6 Scientist 600W N-Type TOPCon Bifacial ModuleLONGi Solar LONGi Hi-MO X6 Scientist 600W N-Type TOPCon Bifacial Mo... $161.29 $0.27/W · 600WJinko Tiger Neo N-Type 600W Bifacial TOPCon Solar PanelJinko Solar Jinko Tiger Neo N-Type 600W Bifacial TOPCon Solar Panel $164.52 $0.27/W · 600WCanadian Solar HiKu6 395W Mono Solar Panel - CS6R-395MS-HLCanadian Solar Canadian Solar HiKu6 395W Mono Solar Panel - CS6R-395MS-HL $162.00 $0.41/W · 395WHyundai HiS-S410YH(BK) 410W Bifacial Commercial Solar PanelHyundai Energy Solutions Hyundai HiS-S410YH(BK) 410W Bifacial Commercial Solar P... $167.76 $0.41/W · 410WTalesun TM7G54M-450 450W Bifacial Solar PanelTalesun Talesun TM7G54M-450 450W Bifacial Solar Panel $185.63 $0.41/W · 450WAptos Solar DNA-120-BF10-440W 440W Bifacial Solar PanelAptos Aptos Solar DNA-120-BF10-440W 440W Bifacial Solar Panel $185.92 $0.42/W · 440WJA Solar 545 W Solar Panel – JAM72D30‑545/MB, 144‑cell BifacialJA Solar JA Solar 545 W Solar Panel – JAM72D30‑545/MB, 144‑cell ... $262.79
  • Generac Guardian 3-Phase 20KW Automatic Standby Air-Cooled Gas Engine Generator in Aluminum Enclosure - G007077-1

    Generac Guardian 3-Phase 20KW Automatic Standby Air-Cooled Gas Engine Generator in Aluminum Enclosure - G007077-1

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    SKU: PES-PS-GEN-0031
    MPN NO

    G007077-1

    Cell / Type

    Generators

    Generac
    $6,003.95 USD
    $6,003.95 USD
    Out of stock
    Sold out
  • SolarEdge 20kW 480VDC 3-Phase SetAPP Inverter w/ AC RSD DC Safety Switch & AFCI - SE20K-USR8TBNU4

    SolarEdge 20kW 480VDC 3-Phase SetAPP Inverter w/ AC RSD DC Safety Switch & AFCI - SE20K-USR8TBNU4

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    SKU: PES-SPS-SIV-0490
    MPN NO

    SE20K-USR8TBNU4

    Cell / Type

    Solar Inverters

    SolarEdge
    $1,640.31 USD
    $1,640.31 USD
    Out of stock
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  • Generator + Transfer Switch 20kW Kit — Best Tier

    Generator + Transfer Switch 20kW Kit — Best Tier

    SKU: GEN_ATS_20KW_BEST
    Cell / Type

    Generator Kits

    PES System Kits
    $32,554.01 USD
    $32,554.01 USD
    In stock
  • Generator + Transfer Switch 20kW Kit — Good Tier

    Generator + Transfer Switch 20kW Kit — Good Tier

    SKU: GEN_ATS_20KW_GOOD
    Cell / Type

    Generator Kits

    PES System Kits
    $6,322.30 USD
    $6,322.30 USD
    In stock
  • Generator + Transfer Switch 20kW Kit — Better Tier

    Generator + Transfer Switch 20kW Kit — Better Tier

    SKU: GEN_ATS_20KW_BETTER
    Cell / Type

    Generator Kits

    PES System Kits
    $8,993.04 USD
    $8,993.04 USD
    In stock
  • Battery Backup 20kWh Kit — Better Tier

    Battery Backup 20kWh Kit — Better Tier

    SKU: BATTERY_BACKUP_20KWH_BETTER
    Cell / Type

    Battery Backup Kits

    PES System Kits
    $48,414.80 USD
    $48,414.80 USD
    In stock
  • Battery Backup 20kWh Kit — Good Tier

    Battery Backup 20kWh Kit — Good Tier

    SKU: BATTERY_BACKUP_20KWH_GOOD
    Cell / Type

    Battery Backup Kits

    PES System Kits
    $25,223.78 USD
    $25,223.78 USD
    In stock
  • Battery Backup 20kWh Kit — Best Tier

    Battery Backup 20kWh Kit — Best Tier

    SKU: BATTERY_BACKUP_20KWH_BEST
    Cell / Type

    Battery Backup Kits

    PES System Kits
    $116,371.91 USD
    $116,371.91 USD
    In stock
  • Generac GNC-6485 20kW-22kW Generator Maintenance Kit for 2013 & Later Hsb Models

    Generac GNC-6485 20kW-22kW Generator Maintenance Kit for 2013 & Later Hsb Models

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    SKU: GAP-P2-GENERACGNC648520KW22
    Cell / Type

    Generators

    Generac
    $29.69 USD
    $29.99 USD $29.69 USD
    Out of stock
    Sold out
  • SMA Sunny Tripower X 480V 20KW 72A String Inverter | STP 20-US-50 — PES Supply

    SMA Sunny Tripower X 480V 20KW 72A String Inverter | STP 20-US-50

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    SKU: GAP-P2-SMASUNNYTRIPOWERX480
    Cell / Type

    Inverters

    SMA
    $4,117.00 USD
    $4,120.00 USD $4,117.00 USD
    Out of stock
    Sold out
  • 20kW Kohler 20RESCL-200SELS Home Backup Generator + 200 Amp RXT ATS

    20kW Kohler 20RESCL-200SELS Home Backup Generator + 200 Amp RXT ATS

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    SKU: GAP-P2-20KWKOHLER20RESCL200
    Cell / Type

    Generators

    Kohler
    $5,701.75 USD
    $5,704.75 USD $5,701.75 USD
    Out of stock
    Sold out
  • Kohler 20kW + 100A 16-Circuit ATS 20RCA

    Kohler 20kW Generator with 100-Amp 16-Circuit Load Center Automatic Transfer Switch| 20RCAL-100LC16

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    SKU: GAP-P2-KOHLER20KWGENERATORW
    Cell / Type

    Generators

    Kohler
    $5,997.00 USD
    $6,000.00 USD $5,997.00 USD
    Out of stock
    Sold out
  • Kohler 20kW + 200A ATS 20RCAL-200SELS

    Kohler 20kW Generator + 200A ATS Whole House Power

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    SKU: GAP-P2-KOHLER20KWGENERATOR2
    Cell / Type

    Generators

    Kohler
    $6,632.38 USD
    $6,649.00 USD $6,632.38 USD
    Out of stock
    Sold out
  • Jackery 5000 Plus 7200W 20kWh LiFePO4 Backup Power System Whole-Home Backup Kit

    Jackery 5000 Plus 7200W 20kWh LiFePO4 Backup Power System Whole-Home Backup Kit

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    SKU: GAP-P2-JACKERY5000PLUS7200W
    Cell / Type

    Batteries

    Jackery
    $9,696.00 USD
    $9,699.00 USD $9,696.00 USD
    Out of stock
    Sold out
  • Growatt APX 20kWh HV LFP Battery

    Growatt APX 20kWh HV LFP Battery

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    SKU: GAP-P2-GROWATTAPX20KWHHVLFP
    Cell / Type

    Batteries

    Growatt
    $6,983.00 USD
    $6,986.00 USD $6,983.00 USD
    Out of stock
    Sold out
  • Generac RD02025ADAL 20kW 1800 RPM Extended Steel Tank Standby Diesel Generator

    Generac RD02025ADAL 20kW 1800 RPM Extended Steel Tank Standby Diesel Generator

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    SKU: GAP-P2-GENERACRD02025ADAL20
    Cell / Type

    Generators

    Generac
    $15,799.40 USD
    $15,347.00 USD $15,799.40 USD
    Out of stock
    Sold out
  • Generac RD02025ADAE 20kW 1800 RPM Aluminum Enclosure Standby Diesel Generator

    Generac RD02025ADAE 20kW 1800 RPM Aluminum Enclosure Standby Diesel Generator

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    SKU: GAP-P2-GENERACRD02025ADAE20
    Cell / Type

    Generators

    Generac
    $18,175.16 USD
    $14,797.00 USD $18,175.16 USD
    Out of stock
    Sold out
  • Cummins Load Shed Power Management Kit 13kW-20kW Generator+ATS

    Cummins Load Shed Power Management Kit 13kW-20kW Generator+ATS

    Sale
    SKU: GAP-CUMMINS-CUMMINSLOADSHED
    Cell / Type

    Generators

    Cummins
    $379.53 USD
    $379.56 USD $379.53 USD
    In stock — 50 available
    Sale

About 20kW Generators

20kW generators from PES Supply provide reliable standby power from top brands including Generac, Cummins, and Briggs & Stratton. A 20kW standby generator powers most mid-size homes (1,500-2,500 sq ft) with central air conditioning and standard appliance loads. These air-cooled standby generators run on natural gas or propane and start automatically during power outages when paired with an automatic transfer switch (ATS).

A 20kW generator can power your central AC, refrigerator, well pump, lights, and major appliances during extended outages. Most models include Mobile Link Wi-Fi monitoring for remote status checks and maintenance alerts. PES Global Group offers competitive pricing, fast shipping from our Louisville, KY operations, expert technical support from our product team, and bulk pallet ordering for contractors and EPCs.

Use our Generator Sizing Calculator to verify {kw_num}kW meets your electrical load requirements, or contact our team for installation guidance and transfer switch compatibility.

Popular 20kW Generators models & specs