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Commercial Standby Generators

Liquid-cooled standby generators built for facilities that cannot afford downtime. Single-phase and three-phase, 30kW to 150kW, from Cummins RS and Briggs Fortress. Automatic transfer within seconds, engineered for continuous commercial duty.

30-150 kW Range
Authorized Factory Dealer
1 & 3-Phase Output Options
Expert Load Sizing Help
Factory Direct Freight

Ships direct from the manufacturer to your facility

Financing Available

0% APR options through Klarna

Factory Authorized Dealer

Full factory warranty on every unit

Commercial Specialists

Load sizing and quote support Mon-Fri 8am-6pm ET

Commercial Standby

Commercial Standby Generators

Liquid-cooled automatic standby. Single-phase and three-phase options for facilities where downtime is not an option.

Best for Light Commercial
A black Briggs & Stratton commercial standby generator, 30kW, with a flat top and vented right panel is shown on a white background. The central logo is visible, providing code-compliant backup power for your needs.

Briggs & Stratton

Briggs & Stratton 30kW Fortress Standby Generator - Liquid Cooled, Dual Fuel, Steel Enclosure

$14,624.00

  • 30kW liquid-cooled, single-phase 120/240V output
  • Dual fuel: natural gas or LP propane
  • Covers small offices, retail, clinics, and light commercial loads
Get a Quote
Best for Mid-Size Business
A beige Cummins generator with a rectangular shape and black base is shown from the side against a white background. The Cummins logo appears on the left, emphasizing dependable 60kW standby power for commercial backup needs.

Cummins

Cummins RS60 Quiet Connect™ Series 60kW Standby Power Generator (120/240V 3-Phase) - Commercial Backup Solution

$28,053.57

  • 60kW liquid-cooled, 3-phase output
  • Handles restaurants, medical offices, and multi-tenant retail
  • Automatic transfer within seconds of an outage
Get a Quote
Best for Large Facility
A large, rectangular beige Cummins generator with a solid front panel and black base provides 100kW commercial backup power. The Cummins logo appears on the left side.

Cummins

Cummins RS100 Quiet Connect™ Series 100kW Standby Power Generator (120/208V 3-Phase) - Commercial Backup System

$42,050.09

  • 100kW liquid-cooled, 3-phase 120/208V output
  • Full-facility coverage for hotels, warehouses, and data centers
  • Quiet Connect enclosure built for critical applications
Get a Quote

Commercial Standby Generators

Commercial Generator Buying Guide

Who Needs a Commercial Standby Generator?

Any business where a power outage means lost revenue, spoiled inventory, or compromised safety needs a standby generator. Restaurants lose refrigerated food within hours. Medical offices cannot operate without power. Hotels, data centers, warehouses, and agricultural operations all carry financial exposure when the grid fails. A properly sized standby generator eliminates that exposure by restoring power automatically, within seconds of an outage.

Sizing for Commercial Applications

Commercial sizing starts with a load calculation, adding up the running and starting wattage of every circuit you need to protect. Critical loads typically include HVAC, refrigeration, lighting, security systems, POS terminals, and life safety equipment. Work with a licensed electrician or contact our team to calculate your exact requirements before selecting a unit.

  • Small offices and retail: 30-50kW covers lighting, HVAC, and essential equipment
  • Restaurants and medical: 60-80kW handles cooking, refrigeration, and HVAC together
  • Large facilities and industrial: 100kW and above for full-facility coverage

Why Liquid-Cooled for Commercial Use

All generators in this collection are liquid-cooled. Liquid-cooled engines circulate coolant through the engine block, allowing sustained operation at high outputs without overheating. This is the correct platform for commercial applications. They are built to run continuously under full load, not just occasional short runs.

Fuel Options: Natural Gas and Propane

Every unit in this collection supports both natural gas and LP propane.

  • Natural gas: connects to the utility line, never runs out on-site, lowest operating cost and the standard for most commercial installations
  • Propane (LP): on-site tank provides independence from the gas utility, common in rural and suburban commercial sites

Code Compliance and Installation Requirements

Commercial generator installations are governed by local building codes, the National Electrical Code (NEC), and NFPA 110 for emergency and standby power systems. Permits are required in virtually every jurisdiction. Your installing contractor pulls the permits, coordinates inspections, and ensures the installation meets code. Plan for a concrete pad, fuel line connection, and automatic transfer switch as part of the total installation cost.

Our Commercial Standby Lineup

Our commercial standby lineup pairs two proven liquid-cooled, dual-fuel platforms. The Briggs Fortress line covers 30kW to 60kW single-phase 120/240V, ideal for small offices, retail, clinics, and light commercial buildings. The Cummins RS line covers 36kW to 150kW three-phase, built for larger commercial and light industrial facilities. Both run continuously under full load and transfer automatically within seconds of an outage.

Why Buy From Mighty Generators

Mighty Generators is a factory authorized dealer for Cummins and Briggs and Stratton. Every unit ships with a full factory warranty and direct factory support for service and parts. Our commercial team works with business buyers on load calculations, custom quotes, and installation referrals. No restocking fees. No fine print. Call (706) 701-8552 Mon-Fri 8am-6pm ET, or submit a quote request online. Commercial inquiries receive a response within one business day.

Commercial Generator FAQs

Sizing, fuel, installation, and compliance. Our commercial team responds within one business day.

Commercial sizing starts with a load calculation across every circuit you need to protect. A restaurant typically needs 40 to 80kW to cover refrigeration, cooking equipment, and HVAC together. A medical office runs 40 to 60kW. Large warehouses and data centers require 100kW and above. Contact our team for a load calculation specific to your facility before selecting a unit.

It depends on your building's electrical service. Single-phase 120/240V is standard in small offices, retail, clinics, and light commercial buildings. Our Briggs Fortress line covers 30kW to 60kW single-phase. Three-phase 120/208V or 277/480V is standard in larger commercial and industrial facilities with heavy motor loads, such as restaurants with large HVAC, warehouses, and data centers. Our Cummins RS line covers three-phase from 36kW to 150kW. Check your main electrical panel or utility bill, or send our team a photo and we will confirm which configuration fits.

Natural gas is the most common choice for commercial applications. It connects to the utility line, never runs out on-site, and carries the lowest operating cost. Propane works where natural gas infrastructure is not available and provides on-site fuel independence. Contact our team to discuss which is appropriate for your facility and local utility setup.

Yes. Commercial installations require building permits, electrical permits, and in many jurisdictions a fire marshal review under NFPA 110. Your installing contractor handles permitting and inspections. Fuel line connections require a licensed gas contractor. Our team can connect you with commercial installers in your area.

Visit our Commercial Power Solutions page to submit a quote request with your facility details, load requirements, and timeline. Our commercial team responds within one business day. You can also call us directly at (706) 701-8552, Mon-Fri 8am-6pm ET.