What size standby generator do I need for my home?

As a rule of thumb: 10–14 kW covers essentials like the refrigerator, furnace blower, sump pump, and lights; 18–22 kW runs most whole homes including one central air conditioner with load management; 24–26 kW handles larger homes with multiple big loads; 50 kW and above covers estates and commercial facilities.

What is the difference between air-cooled and liquid-cooled standby generators?

Air-cooled units from 10 kW to 26 kW handle essentials-only to true whole-home coverage for houses up to roughly 4,000 square feet. Liquid-cooled standby generators from 30 kW to 150 kW step up to estates, 400-amp services, agricultural operations, and light commercial buildings.

Do standby generators run on natural gas or propane?

Most residential air-cooled units run on natural gas or propane with no on-site fuel tank required when utility gas is available. Larger liquid-cooled units add diesel options for maximum runtime and load response.

How fast does a standby generator restore power?

A permanently installed standby generator connected through an automatic transfer switch detects a utility outage, starts itself, and restores power to your home or facility in under 30 seconds — no extension cords, no refueling in the dark, no manual intervention.

What are Standby Generators, and how do they work?

Standby generators are backup power systems that automatically detect outages and restore power within seconds. They are connected to your electrical panel and start running whether you are home or away.

How long can Standby Generators run continuously?

Most standby generators can operate for days as long as they have sufficient fuel and proper ventilation. Runtime depends on fuel type, capacity, and load usage.

Do Standby Generators require regular maintenance?

Yes. These systems need periodic oil changes, air filter replacement, battery checks, and inspection of key components. Using proper maintenance kits helps extend the generator’s lifespan.

What size Standby Generators do I need for my home or business?

Generator size depends on the total wattage of essential appliances or full-load requirements. Smaller homes may need 8–12 kW, while commercial buildings often require 20–100+ kW models.

Are Standby Generators safe to use during storms?

Absolutely. They are built with weather-resistant enclosures and safety mechanisms to operate securely in harsh conditions. Proper installation ensures optimal performance even during severe weather.

Standby Generators — Whole-Home, Estate & Commercial Backup Power

86 products

Sort by

Top Sellers — Market Front-Runners The same Tier-1 lines as the big national players · live PES pricing

Top Seller

Trina Solar Trina Solar Vertex N 600W N-Type TOPCon Commercial Module $158.06 $0.26/W · 600W Top Seller

ZNshine 400W ZXM7-SH108-400/M All Black Monocrystalline Solar Panel

ZNShine ZNshine 400W ZXM7-SH108-400/M All Black Monocrystalline... $136.86 $0.34/W · 400W Top Seller

Znshine 405W Black ON Black 108 HALF-CELL MONO Solar Panel - ZXM7-SH108-405/M

ZNShine Znshine 405W Black ON Black 108 HALF-CELL MONO Solar Pa... $147.61 $0.36/W · 405W

LONGi Hi-MO X6 Scientist 600W N-Type TOPCon Bifacial Module

LONGi Solar LONGi Hi-MO X6 Scientist 600W N-Type TOPCon Bifacial Mo... $161.29 $0.27/W · 600W

Jinko Solar Jinko Tiger Neo N-Type 600W Bifacial TOPCon Solar Panel $164.52 $0.27/W · 600W

Canadian Solar Canadian Solar HiKu6 395W Mono Solar Panel - CS6R-395MS-HL $162.00 $0.41/W · 395W

Hyundai HiS-S410YH(BK) 410W Bifacial Commercial Solar Panel

Hyundai Energy Solutions Hyundai HiS-S410YH(BK) 410W Bifacial Commercial Solar P... $167.76 $0.41/W · 410W

Talesun Talesun TM7G54M-450 450W Bifacial Solar Panel $185.63 $0.41/W · 450W

Aptos Aptos Solar DNA-120-BF10-440W 440W Bifacial Solar Panel $185.92 $0.42/W · 440W

JA Solar 545 W Solar Panel – JAM72D30‑545/MB, 144‑cell Bifacial

JA Solar JA Solar 545 W Solar Panel – JAM72D30‑545/MB, 144‑cell ... $262.79

Cummins C50D6 - 50kW Quiet Connect Series 120/240V 1 Phase Liquid Cooled Standby Generator - A063P966

Cummins C50D6 - 50kW Quiet Connect Series 120/240V 1 Phase Liquid Cooled Standby Generator - A063P966

SKU: PES-PS-GEN-00110

MPN NO

A063P966

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $24,482.41 USD

Regular price Sale price $24,482.41 USD
Unit price per

Available to order
Cummins C30D6 - 30kW Quiet Connect Series 120/240V 1 Phase Liquid Cooled Standby Generator - A063P964

Cummins C30D6 - 30kW Quiet Connect Series 120/240V 1 Phase Liquid Cooled Standby Generator - A063P964

SKU: PES-PS-GEN-00109

MPN NO

A063P964

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $21,699.15 USD

Regular price Sale price $21,699.15 USD
Unit price per

Available to order
Cummins C200D6D - 200kW Quiet Connect Series 120/240V 1 Phase Liquid Cooled Standby Generator - A061T477

Cummins C200D6D - 200kW Quiet Connect Series 120/240V 1 Phase Liquid Cooled Standby Generator - A061T477

SKU: PES-PS-GEN-00107

MPN NO

A061T477

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $42,035.86 USD

Regular price Sale price $42,035.86 USD
Unit price per

Available to order
Cummins C175D6D - 175kW Quiet Connect Series 120/240V 1 Phase Liquid Cooled Standby Generator - A061T476

Cummins C175D6D - 175kW Quiet Connect Series 120/240V 1 Phase Liquid Cooled Standby Generator - A061T476

SKU: PES-PS-GEN-00106

MPN NO

A061T476

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $38,138.06 USD

Regular price Sale price $38,138.06 USD
Unit price per

Available to order
Cummins C150D6D - 150kW Quiet Connect Series 120/240V 1 Phase Liquid Cooled Standby Generator - A061T474

Cummins C150D6D - 150kW Quiet Connect Series 120/240V 1 Phase Liquid Cooled Standby Generator - A061T474

SKU: PES-PS-GEN-00105

MPN NO

A061T474

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $37,191.69 USD

Regular price Sale price $37,191.69 USD
Unit price per

Available to order
Cummins C125D6D - 125kW 120/240V 1 Phase Light Commercial Diesel Standby Generator - A060A344

Sale

Cummins C125D6D - 125kW 120/240V 1 Phase Light Commercial Diesel Standby Generator - A060A344

SKU: PES-PS-GEN-00104

MPN NO

A060A344

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $34,101.10 USD

Regular price ~~$38,976.92 USD~~ Sale price $34,101.10 USD
Unit price per
-13%

Available to order

Sale
Cummins C100D6C - 100kW 120/240V 1 Phase Light Commercial Diesel Standby Generator - A061T471

Cummins C100D6C - 100kW 120/240V 1 Phase Light Commercial Diesel Standby Generator - A061T471

SKU: PES-PS-GEN-00103

MPN NO

A061T471

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $29,954.18 USD

Regular price Sale price $29,954.18 USD
Unit price per

Available to order
Cummins C80D6C - 80kW 120/240V 1 Phase Light Commercial Diesel Standby Generator - A061T469

Sale

Cummins C80D6C - 80kW 120/240V 1 Phase Light Commercial Diesel Standby Generator - A061T469

SKU: PES-PS-GEN-00102

MPN NO

A061T469

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $26,558.67 USD

Regular price ~~$28,923.81 USD~~ Sale price $26,558.67 USD
Unit price per
-8%

Available to order

Sale
Cummins C60D6 - 60kW 120/240V 1 Phase Light Commercial Diesel Standby Generator - A060A345

Cummins C60D6 - 60kW 120/240V 1 Phase Light Commercial Diesel Standby Generator - A060A345

SKU: PES-PS-GEN-00101

MPN NO

A060A345

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $21,905.01 USD

Regular price Sale price $21,905.01 USD
Unit price per

Available to order
Cummins RS150 - 150kW Quiet Connect Series 120/240V Three Phase Liquid Cooled Standby Generator - A063A486

Cummins RS150 - 150kW Quiet Connect Series 120/240V Three Phase Liquid Cooled Standby Generator - A063A486

SKU: PES-PS-GEN-00100

MPN NO

A063A486

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $47,378.59 USD

Regular price Sale price $47,378.59 USD
Unit price per

Available to order
Cummins RS150 150kW Standby Generator | 3-Phase 277/480V | Quiet Connect

Cummins RS150 150kW Standby Generator | 3-Phase 277/480V | Quiet Connect

SKU: PES-PS-GEN-0099

MPN NO

A063A484

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $47,378.59 USD

Regular price Sale price $47,378.59 USD
Unit price per

Available to order
Cummins RS150 - 150kW Quiet Connect Series 120/208V Three Phase Liquid Cooled Standby Generator - A063A483

Cummins RS150 - 150kW Quiet Connect Series 120/208V Three Phase Liquid Cooled Standby Generator - A063A483

SKU: PES-PS-GEN-0098

MPN NO

A063A483

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $44,857.57 USD

Regular price Sale price $44,857.57 USD
Unit price per

Available to order
Cummins RS150 150kW Standby Generator | 1-Phase 120/240V | Quiet Connect

Cummins RS150 150kW Standby Generator | 1-Phase 120/240V | Quiet Connect

SKU: PES-PS-GEN-0097

MPN NO

A063B605

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $48,628.92 USD

Regular price Sale price $48,628.92 USD
Unit price per

Available to order
Cummins RS125 125kW Standby Generator | 3-Phase 120/240V | Quiet Connect

Cummins RS125 125kW Standby Generator | 3-Phase 120/240V | Quiet Connect

SKU: PES-PS-GEN-0096

MPN NO

A063A453

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $42,436.05 USD

Regular price Sale price $42,436.05 USD
Unit price per

Available to order
Cummins RS125 125kW Standby Generator | 3-Phase 277/480V | Quiet Connect

Cummins RS125 125kW Standby Generator | 3-Phase 277/480V | Quiet Connect

SKU: PES-PS-GEN-0095

MPN NO

A063A449

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $42,436.05 USD

Regular price Sale price $42,436.05 USD
Unit price per

Available to order
Cummins RS125 125kW Standby Generator | 3-Phase 120/208V | Quiet Connect

Cummins RS125 125kW Standby Generator | 3-Phase 120/208V | Quiet Connect

SKU: PES-PS-GEN-0094

MPN NO

A063A442

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $42,436.05 USD

Regular price Sale price $42,436.05 USD
Unit price per

Available to order
Cummins RS125 125kW Standby Generator | 1-Phase 120/240V | Quiet Connect

Cummins RS125 125kW Standby Generator | 1-Phase 120/240V | Quiet Connect

SKU: PES-PS-GEN-0093

MPN NO

A063B604

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $44,685.30 USD

Regular price Sale price $44,685.30 USD
Unit price per

Available to order
Cummins RS100 100kW Standby Generator | 3-Phase 120/240V | Quiet Connect

Cummins RS100 100kW Standby Generator | 3-Phase 120/240V | Quiet Connect

SKU: PES-PS-GEN-0092

MPN NO

A054F874

Cell / Type

Generators

Vendor:
Cummins

No reviews

Regular price $39,805.76 USD

Regular price Sale price $39,805.76 USD
Unit price per

Available to order

About Standby Generators — Whole-Home, Estate & Commercial Backup Power

Shop standby generators at PES Supply for permanent, automatic backup power. Our standby generators from Generac, Cummins, and Briggs & Stratton run on natural gas or propane, start automatically during outages, and provide whole-home or commercial backup power from 10kW to 60kW+.

Unlike portable generators, standby units are permanently installed outside your home, connected to your electrical panel via an automatic transfer switch, and require no manual setup or fueling. Most models include Wi-Fi monitoring via Mobile Link for remote status 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 (kW to Amps) to determine the right standby generator size for your home's electrical load, or call our team for expert sizing and installation guidance.

Shop by Category

More Categories

Top Brands

Ways to Save

Browse Everything

Panel Types

Top Brands

Shop by Wattage

Solar Panels

Inverter Types

Top Brands

Accessories

Inverters

Battery Types

Top Brands

Shop by Capacity

Energy Storage

Mounting Systems

Top Brands

More Brands

Mounting & Racking

Controllers

Top Brands

Off-Grid Power

Charge Controllers

Generator Types

Top Brands

Shop by kW

Generators

Chargers

Top Brands

Also See

EV Charging

Product Types

Top Brands

Power Distribution

Electrical

Learn

Guides

Services

Support

Resources

Solar Panels

Residential Panels

Commercial Panels

Utility-Scale Panels

Inverters

String Inverters

Hybrid Inverters

Microinverters

Energy Storage

Lithium Batteries

Generators

Home Standby

Portable Generators

Standby Generators — Whole-Home, Estate & Commercial Backup Power

Filter and sort

Filter

Top Sellers at Your Store

Mission Solar

EG4 Electronics

Outback Power

Magnum Energy

EG4 Electronics

EG4 Electronics

Generac

LG

EcoFasten

Xuri Solar

86 products

About Standby Generators — Whole-Home, Estate & Commercial Backup Power

Popular Standby Generators — Whole-Home, Estate & Commercial Backup Power models & specs