Briggs & Stratton Fortress 30kW Commercial Standby Generator, 120/240V Single-Phase

Is the Briggs & Stratton Fortress 30kW the Right Standby Generator for Your Business?

The Briggs & Stratton Fortress 30kW (model 076880) is a liquid-cooled commercial standby generator for 120/240V single-phase service. It's rated 30kW on either liquid propane or natural gas (125 amps), runs on a 1,600cc engine and starts automatically when utility power fails. Briggs & Stratton assembles and engineers it in the USA with domestic and foreign parts.

At 30kW it's the entry point to the Fortress line: the step up from a residential home standby for small businesses, offices, shops, farms and large homes that need more capacity on single-phase service.

Mighty Generators supplies the Fortress 30kW by quote. It ships freight direct from the manufacturer, typically in 5 to 6 weeks, so you can have the pad, gas line and transfer switch ready when it arrives.

Fortress 30kW at a Glance

• Standby rating: 30kW LP / 30kW NG
• Electrical: 120/240V single-phase, 125 A LP / 125 A NG, 125 A circuit breaker
• Engine: 1,600cc, liquid cooled
• Fuel: liquid propane or natural gas
• Normal operating sound: 66 dB (Briggs & Stratton rating)
• Size and weight: 71 x 32.3 x 37 in (L x W x H), 1,000 lb
• Enclosure: steel, powder coated, with a block heater as standard
• Rated to UL 2200 and CSA C22.2 No.100-14
• Warranty: 6-year limited, parts, labor and travel (Briggs & Stratton)

Briggs & Stratton Fortress 30kW Features and Performance

Engine and Fuel

The 1,600cc liquid-cooled engine runs on liquid propane or natural gas. Briggs rates the same 30kW and 125 amps on either fuel. At 50% load it uses about 328,000 BTU per hour on propane or 293,000 BTU per hour on natural gas. A block heater is standard, so the engine is warm and ready to take load in cold weather.

Monitoring and Control

The Briggs & Stratton controller manages automatic start and transfer. EnergyTrak remote monitoring adds an app that shows generator status from anywhere and lets your dealer troubleshoot and diagnose issues remotely (subscription required). The Fortress also works with Symphony Choice power management, which distributes power to selected loads automatically so the generator doesn't overload and shut down; the transfer switch and modules are sold separately.

Enclosure

The Fortress 30kW sits in a steel enclosure with an advanced powder-coat finish that Briggs designs to resist chips, abrasion and corrosion. Briggs lists its normal operating sound at 66 dB.

Where the Fortress 30kW Fits

Start with the electrical service. The Fortress line is 120/240V single-phase. If your building is on three-phase service, the Cummins RS Quiet Connect generators are the better match. Within single-phase, size from a load calculation that includes motor starting and HVAC, not from square footage, and our team can help match the result to the right Fortress size.

Fortress 30kW vs the Rest of the Fortress Line

Planning the Fortress 30kW Installation

• Transfer switch: required and quoted separately, sized to your service entrance.
• Delivery and pad: 1,000 lb assembled, 71 x 32.3 x 37 inches, shipped by freight.
• Fuel supply: give your gas utility or propane supplier the 293,000 BTU/hr (NG) or 328,000 BTU/hr (LP) 50% load figure and ask them to confirm capacity at full load.
• Code and placement: install to local code and NFPA 37, keep exhaust away from windows, doors, vents and crawl spaces, and keep carbon monoxide detectors installed and maintained in the building.

Briggs & Stratton Fortress 30kW Specifications

Standard Equipment Listed by Briggs & Stratton

• Block heater
• Briggs & Stratton controller
• Steel enclosure

Confirm the final configuration and any accessories on your written quote.

Frequently Asked Questions About the Briggs & Stratton Fortress 30kW

What electrical service does the Briggs & Stratton Fortress 30kW need?

The Fortress 30kW (model 076880) is a 120/240V single-phase generator with a 125 A circuit breaker. It suits businesses, farms and large properties on single-phase service. If your building has three-phase service, look at the Cummins RS Quiet Connect line instead, which is built for 120/208V three-phase.

How much power does the Fortress 30kW make on natural gas versus propane?

Briggs & Stratton rates the Fortress 30kW at 30kW and 125 amps on both liquid propane and natural gas. At 50% load it burns about 328,000 BTU per hour on propane or 293,000 BTU per hour on natural gas, which your fuel supplier will use to size the supply.

How loud is the Briggs & Stratton Fortress 30kW?

Briggs & Stratton lists a normal operating sound level of 66 dB for the Fortress 30kW. It's housed in a steel enclosure with a powder-coat finish, and Briggs & Stratton describes the liquid-cooled Fortress as commercial-grade.

What warranty comes with the Briggs & Stratton Fortress 30kW?

Briggs & Stratton covers the Fortress 30kW with a 6-year limited warranty that includes parts, labor and travel for the full length of the warranty. Complete terms are in the operator's manual and on briggsandstratton.com.

What should I plan for before installing the Fortress 30kW?

Plan for a 1,000 lb unit measuring 71 x 32.3 x 37 inches, plus a transfer switch, which is quoted separately. Installation has to follow local code and NFPA 37, including keeping exhaust away from windows, doors and air intakes. It ships freight direct from the manufacturer with a typical 5 to 6 week lead time, so request a quote with your service size and load list.

Warranty and Support

Briggs & Stratton covers the Fortress 30kW with a 6-year limited warranty that includes parts, labor and travel for the full length of the warranty; see the operator's manual or briggsandstratton.com for complete terms. Warranty coverage and service come from Briggs & Stratton and its dealer network. Mighty Generators is an authorized Briggs & Stratton dealer: we'll check the size against your load, quote the transfer switch, and coordinate freight to your site.

Ready for a quote? Use Request a Quote on this page, or call (888) 775-9048 with your service size and a list of the loads you need to carry.