Briggs & Stratton Fortress 35kW Liquid Cooled Standby Generator Single Phase
SKU: 79181647834

Briggs & Stratton Fortress 35kW Liquid Cooled Standby Generator Single Phase

$8962.65 $9958.50
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Description

Briggs & Stratton Fortress 35kW Liquid Cooled Standby Generator Single PhaseBriggs and Stratton 35 kW Fortress Standby Generator Liquid cooled, emergency grade backup power that starts automatically in seconds (Automatic Transfer Switch required) The Briggs and Stratton 35 kW Fortress is the sweet spot standby generator for larger homes and light commercial sites that need real coverage, but do not want to jump all the way to the biggest units in the lineup. It delivers 35,000 watts of liquid cooled, 1800 RPM performance with

Briggs and Stratton 35 kW Fortress Standby Generator

Liquid-cooled, emergency-grade backup power that starts automatically in seconds (Automatic Transfer Switch required)

The Briggs and Stratton 35 kW Fortress is the “sweet spot” standby generator for larger homes and light commercial sites that need real coverage, but do not want to jump all the way to the biggest units in the lineup. It delivers 35,000 watts of liquid-cooled, 1800 RPM performance with clean, regulated power for modern electronics and a warranty package that is hard to beat.

With the required automatic transfer switch (ATS) installed, the Fortress system senses an outage, starts automatically, and restores power within seconds. When utility power returns, it switches back automatically.

Why the Fortress 35 kW is a smart fit

Full 35 kW on natural gas or propane

Unlike some higher output standby models that produce less on natural gas, this unit is rated at:

  • 35,000W on Natural Gas
  • 35,000W on Propane (LP)

That makes planning easier when you want strong output without guessing what you will lose when running on NG.

Big power without oversized footprint

The 35 kW Fortress uses the same commercial-style standby format, but in a package that stays manageable for residential installs:

  • 91 in L x 39.4 in W x 41 in H
  • 1540 lbs

It is substantial equipment, but still sized for typical standby pads and placement constraints on larger homes.

4.3L liquid-cooled 6-cylinder at 1800 RPM

This Fortress model uses a 4.3L industrial 6-cylinder liquid-cooled engine designed for long-run reliability and steady performance.

Benefits of 1800 RPM liquid-cooled design:

  • Lower mechanical stress than high-RPM air-cooled units
  • Smoother, quieter operation for its class
  • Better temperature control during extended outages

Automatic backup that works like it should

With an ATS installed, the system:

  • Detects utility power loss
  • Starts automatically within seconds
  • Transfers the home or building to generator power
  • Monitors utility restoration
  • Transfers back to utility once stable

Important: Automatic transfer switch required and not included.

Clean, stable power for sensitive electronics

The Fortress 35 kW is built to play nicely with today’s electronics-heavy homes and offices.

  • Brushless alternator
  • Automatic Voltage Regulation
  • Designed for stable output that supports computers, networking gear, security systems, and modern HVAC controls

This is the kind of power quality that keeps a backup system from creating new problems during an outage.

AMF controller that keeps you informed

The Briggs and Stratton AMF Controller (UL Recognized) is designed to make ownership straightforward:

  • Alpha-numeric scrolling display
  • Diagnostic monitoring and fault codes
  • Simple weekly exercise scheduling

Weekly exercise is a big deal. It keeps the system ready and helps catch issues before a real outage forces the test.

Cold weather ready and service friendly

Pre-installed block heater

Supports easier starting and more consistent performance in cold weather.

Weather-ready enclosure and service access

The Fortress enclosure is built for outdoor standby duty with convenient service access points that reduce disassembly during routine maintenance.

Turnkey extras included

  • Automatic battery charger
  • Hour meter

Performance specs that matter

Electrical output

  • Rated watts: 35,000W
  • Voltage: 120/240V single-phase
  • Frequency: 60 Hz
  • Rated amps: 146A
  • Circuit breaker size: 175A
  • UL listed: Yes

Fuel consumption

Natural Gas

  • 50% load: 258 ft³/hr
  • 100% load: 405 ft³/hr

Propane (LP)

  • 50% load: 2.86 gal/hr
  • 100% load: 4.46 gal/hr

Engine

  • Engine: Briggs and Stratton
  • Displacement: 4300 cc
  • RPM: 1800
  • Starting: 12V auto start
  • Low oil shutdown: Yes

Requirements and install notes

  • Automatic transfer switch required (not included)
  • Starting battery required (not included)
    Listing references 775 CCA. Always confirm exact battery spec in the installation manual for the selected configuration.
  • Concrete mounting pad required (not included)

This is an emergency-grade standby unit and should be installed to code by qualified professionals, especially for fuel supply sizing and transfer switch integration.

Warranty coverage

  • Consumer warranty: 6 years
  • Commercial warranty: 2 years

The consumer warranty includes parts, labor, and travel, which is a major value in this class.

Bottom line

The Briggs and Stratton 35 kW Fortress is a high-capacity, liquid-cooled standby generator for homeowners and light commercial sites that want strong whole-building backup, clean power for electronics, and consistent output on either natural gas or propane. Add the required transfer switch and proper fuel supply, and it becomes a fast-starting, reliable power plan that is ready for long outages.

Resource

Manuals:

Generator Sizing Chart

Spec Sheet

Product Manual

Controller Manual

Warranty 

Energy Systems Central is an authorized dealer of BAS Energy Systems.

Warranty Document

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 79181647834

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4.3 ★★★★★
Based on 151 reviews
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Product Reviews
D
Verified Purchase
DP
Dallas, US
★★★★★ 5
Perfect “Command Center” Monitor for Mac Studio – Worth the Money
Title: Perfect “Command Center” Monitor for Mac Studio – Worth the Money I’m using this Dell U4025QW with a Mac Studio M2 Max, and it’s exactly what I wanted: a huge, sharp, curved workspace that also handles games really well. The 40” 5K2K screen lets me keep Docs, email, browser, and gradebook all open at once without feeling cramped, and the curve makes it comfortable to use for long stretches. Text is clear, colors look great out of the box, and bumping it up to 120 Hz makes macOS feel noticeably smoother. The Thunderbolt/USB-C hub is a big bonus – one cable to the Mac, and everything else (keyboard, mouse, etc.) can live on the back of the monitor, so the desk stays clean. It’s not cheap, but if you live in documents all day and also want your games to look and run smoothly, this is a fantastic “do it all” monitor and I have zero regrets about the purchase.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 29, 2025
T
Verified Purchase
Tim Boggs
Pawtucket, US
★★★★★ 5
The best business monitor
I have used many of the monitors in the Dell UltraSharp line and thought that my previous monitor, the U4021QW was the apex of Business monitors. The U4025QW improves on it in small but meaningful ways. Looking at the monitor, you can't visually tell the difference at first glance. To me the ultra-wide curved monitor format is preferrable to dual monitors. The 5120 x 2160 / 21:9 screen ratio gives the business user more vertical space while not sacrificing the horizontal space. Many ultrawide monitors give you the width of 5120 but stick you with 1440 vertically. That resolution always felt cramped to me. This connectivity on this monitor far exceeds its predecessor. It is upgraded from Thunderbolt 3 to Thunderbolt 4, adds 2 usb-c ports and one USB-A, giving a total of 5 USB-A and 5 USB-C. This allowed me to replace my old desktop dock and go with a direct connection to the monitor for everything. When reading about the monitor, I thought the drop-down ports were a bit gimmicky, but it is a big improvement over the location on the previous model. This is very accessible and helps with wireless devices whose signal degrades by being placed behind the monitor. The monitor is pricey, but I think it is worth it if you are on your computer all day every day. As on co-worker once said, the monitor is the part of the computer that we use 100% of the time we interact with it.
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Reviewed in the United States on December 13, 2025
L
Verified Purchase
Lacey Groff
Natrona Heights, US
★★★★★ 5
Extremely sturdy
Color: Black-Mount
I purchased this heavy-duty dual gaming monitor arm holder as a birthday gift for my husband to mount his curved gaming screens, and it completely transformed his setup. It feels extremely sturdy and well-built, easily supporting both monitors without any wobble or instability. The adjustability is excellent. He can tilt, swivel, and reposition each screen with ease, which makes it perfect for both gaming and everyday computer use. It also helps clear up a lot of desk space, giving his setup a much cleaner and more organized look. Installation was straightforward, and the mounting hardware felt solid and secure. Once everything was set up, the arms moved smoothly but stayed firmly in place when adjusted. He absolutely loved it and immediately noticed how much more comfortable and immersive his gaming experience became. Overall, this is a high-quality, durable monitor mount that made a perfect upgrade for his gaming station and a great birthday gift.
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Reviewed in the United States on April 23, 2026
J
Verified Purchase
Joel R Fisk
Natrona Heights, US
★★★★★ 5
The Product is Great - The Customer Service is Even Better
Color: Black-Mount
I want to preface by saying I have never written a review for a product on Amazon. Having said that I felt compelled to review this particular product after an incredibly positive interaction I had with AVLT. I purchased this set of monitor arms due to the fact that my desk is relatively small, as is the space I have to work with while at my computer. I currently have two monitors, a 34" Samsung 2K monitor for gaming, and a 32" Samsung 1080p monitor. After purchasing this product and assembling it, I realized my 2nd monitor (32") was a few years too old and the bracket adapter for the monitor arm didn't fit. That was fine, as at least I had some extra space to work with until I got myself a new monitor to use with the other monitor arm. Fast forward several months and I finally had the monitor I needed - only to find out that I had lost or misplaced the additional bracket. So now I had 3 monitors and even less space to work with. After a lengthy search for a sufficient replacement part, I finally reached out to AVLT in desperation regarding this missing bracket. My query was answered by an employee named "George" the very same day, and within 48 hours I was able to secure the replacement bracket which is currently en route to my house from Taiwan. Alongside the headache of not being able to properly mount the monitors I had on hand, I start working from home this coming week, and my wife is currently 33 weeks pregnant. Needless to say, the ease with which I was able to negotiate this minor, yet irritating problem I was dealing with has helped me more than any Amazon review can ever repay. The help I received from George was simply outstanding, and I hope he receives the recognition he deserves from the company he works for. Sometimes even little things like a quick response can help people more than you realize. Thank you, George and AVLT! Oh, and the monitor arms are great. They're sturdy (metal not plastic), firmly clamp to my desk, and are easily adjustable. As stated in some previous reviews, there is a bit of clearance needed behind your desk in order for these monitor arms to move about, but that's a minor inconvenience at worst. I recommend them, and the fact that the company is there to help should anything go awry is extremely helpful in a world where the emphasis on this seems to be fading away. If I ever need a product similar to this one, or know anyone who does, I will recommend AVLT products specifically based on the customer service I received (the product is awesome too). Thanks again, George! - Joel
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Reviewed in the United States on July 30, 2023
G
Verified Purchase
Grong 1969
Fort Morgan, US
★★★★★ 5
Sturdy and super strong
Color: Black-Mount
This product is very well made heavy duty no plastic parts basically all metal less than 1 % plastic. Pro's holds monitors easily and one of mine weights 19.8 pounds according to the manufacture and the other one without stand that came with it weights 25 pounds don't know what they were thinking when they built that one hard to find arms to support that. But this arm system takes it like a pro yes you have to pay attention to which way you turn the adjustment screws but they are clearly marked. Had no problem assembling it or putting it together two installs one for a clamp on the edge one for a hole. I used the edge clamp and that beast is not coming off. I did tighten one side and then the other went back and forth between the two main screws until I got them equally tight to insure the monitors would not fall. They cost way more than this arm system. Cons: There are 4 screws that hold the plate that holds the clamp screws plate. They are preinstalled and slip into a hole and slot configuration. Remove them completely and throw them out go to your local hardware store and get hardened screws they cost me about sixty cents apiece. I also got some washers and put them on the replacement bolts and affixed them so that the slot holes are basically just regular holes. I pushed the new screws down on the slot position and tightened. Now anyone that reads this I know is asking why? I'm 60 plus years old not a he-man or body builder never been actually been on the lighter side of strength. Not that I'm weak but in my day I have busted and broke things by overtightening those days are sadly gone. I did not use any extention or more commonly called a cheater bar on the allen wrench but 2 of the 4 screw heads stripped out and had to be removed with pliers. I also tried my set of allen wrenches on the screws thinking maybe cheap allen wrench no it was the screws that head that was I suspect too soft and it rounded out. Just pliers not vise grips so they were not terribly tight. I did not have to retap the holes so they were not cross threaded. 1 out of four that failed could be called a bad screw 2 out of four are cheap and not worth using and for that reason since they are a critical part of the clamp locking system I decided to get hardened screws which will probably not strip out or break the threads in the plate would probably tear out first and that would take some real doing. Outside of those screws and the expected failure of the cable holding plastic part that sits on the back of the clamp to hold cables and makes a nice place to store the allen keys to adjust the arm if needed that was a nice touch this thing is rock solid. Solution for the plastic cable holding part is simple a cable tie holds that in place yes it maybe a touch tacky but oh well hang me for wanting it to stay in place. Yes, I would recommend this to someone and have Yes, I think it is a good value Yes, I think it is going to last a long time and the gas shocks seem to be strong Yes, I would buy this again. No, I do not think the problem I had should deter anyone from buying this just be aware that these screws might be soft and probably should be upgraded before assembling this thing the first time. I would if the manufacture reads this recommend that they take a real good look at those screws and maybe see about getting a better grade. No I do not blame them they buy stuff and maybe not even be aware that the screws have a fair possibility of stripping out. But when someone puts $800.00 plus dollars on this it would really be stupid to have the problem I had and trust the other 2 screws to hold since I could not get 2 of them to tighten enough to take the wiggle out of the assembly.
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Reviewed in the United States on May 7, 2020

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