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48kW Protector

Model #RG04845

Starting At

$17,569.00 MSRP Where To Buy

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Generac Protector 48kW Standby Generator

Looking to back up your entire home or commercial business? Consider the Protector Series gaseous automatic backup generator line. These units power all appliances, electronics, pumps and motors during power outages, allowing you to continue living life comfortably and keeping business operating without interruption.

 What Makes the Protector Series Such a Great Choice?
The Generac 4.5L is a purpose-built engine designed from the ground up by Generac and made in Wisconsin. Generac is one of the only manufacturers to design & produce a complete generator which includes our own engine, alternator, fuel system, controller and enclosure in the U.S.

Generac’s 22kW to 150kW product packs more power into a smaller footprint - ideal when space is a premium.  The neutral styling, color and small footprint fits unobtrusively into landscaping.
The Generac 4.5L engine intensifies best-in-industry performance and reliability.  The purpose-built engine is at the heart of a new generator designed from the ground up by Generac and made in Wisconsin, USA. Generac is one of the few manufacturers producing a complete generator – engine, alternator and controller.

Generac Designed & Built Engine – Generac Designed & Built Engine Purpose-built exclusively for generators, in Wisconsin, USA*. Utilizes the first in class, dual-valve ultra-low pressure fuel delivery system and intelligent proprietary engine controls that manage over 100 performance functions to ensure peak efficiency in all temperature ranges and elevations. The engine consumes 25% less fuel than previous engines, is capable of operating at the lowest fuel pressure in the industry at 3.5” of water column while still providing excellent motor starting capability. *Assembled in the USA using domestic and foreign parts.

True Power™ Technology – Delivers utility-grade power quality with less than 5% total harmonic distortion (THD) for clean, smooth operation of sensitive electronics and appliances.  Generac controlling its high-efficiency alternator design and production insures industry-leading surge protection, performance, and longevity.

Small Footprint Generac liquid-cooled product packs more power into the smallest footprint – ideal when space is a premium. The neutral styling, color and small footprint fits unobtrusively into landscaping.

Smart, User-Friendly Controls – Generac’s Evolution™ Controller is visible and accessible without opening the generator enclosure. The Evolution Controller features a multilingual LCD display that allows users to monitor and track maintenance intervals to ensure your generator is always in top operating condition.

18” Offset –​ Generators Can Be Installed Just 18” From A Structure – ideal for tight lot lines or other space constraints.

Tough, Durable All-Aluminum Enclosures – Our RhinoCoat™ powder-coated finish helps make corrosion-resistant aluminum perfect for all weather conditions. Protector units are shielded from the inside out - a durable coating protects the internal frame from rust.

Quiet-Test™ Self-Test Mode – runs at a lower, quieter RPM for a five or twelve minute test, to ensure the system is running properly while consuming less fuel. Quiet-Test Self-Test mode can be programmed to run weekly, bi-weekly, or monthly.

Mobile Link™ Connectivity - allows you to monitor the status of your generator from anywhere in the world using a smartphone, tablet or PC.  Easily access information such as the current operating status and the generator's maintenance schedule. Learn more about Mobile Link
Mobile Link comes standard with Protector Series 22 - 100 kW gaseous models and diesel (RD) models.  The Wi-Fi device is standard on every Protector series generator except for the RG13090/RG15090 and the 130 - 150 kW gaseous models.

5-Year Limited Warranty for automatic standby generators. Extended warranty options available.

Generac <strong>Protector 48kW</strong> Standby Generator
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Rated 5 out of 5 by from Generac by All Phase Electric works great! We could not be happier with this generator. It does exactly what we need it to do. All Phase Electric did a great job with the Installation start to finish. I am not worried any longer when we lose power, all of our employees can still work and the phones are still ringing. Thank for keeping us up and running at Stevens Glass LLC.
Date published: 2024-02-09
Rated 5 out of 5 by from Wish I had purchased 22 yrs ago. Nice and quiet. Will eliminate worries about hurricanes.
Date published: 2023-08-16
Rated 1 out of 5 by from New unit, failed twice in three weeks 48kW unit, big and bulky, installed less than month ago and lost power twice and TWICE THE GENERAC HAS FAILED TO TURN ON! Working with electrician and still not fixed. So disappointed in this $20K+ “investment”
Date published: 2023-07-17
Rated 4 out of 5 by from Good experience with a few bugs to get off my chest... The lead contractor for my project did a great job. Unfortunately, he did have to spend a lot of time apologizing for the "sub's" work. The concrete pad is below standards and looks like it. On the bright side, I've had power drop out more than just a few times since the install, and within seconds, my Generac is up and running. Although I did a lot of poring over my budget to justify this, by the second instance of power dropping out and my generator picking up the slack, I feel like "it's a bargain at twice the price"!? Very pleased I made the choice. It's all automatic, and always ready, and I don't have to do a thing!
Date published: 2023-07-11
Rated 5 out of 5 by from Great Experience with Generator Supercenter of Nashville I have a mixed review. I love the product and I enjoy working with Generator Supercenter of Nashville. But my overall experience is leaning negative because of unbelievable hassles getting propane. While that has nothing to do with the generator, it has everything to do with it because the generator uses a lot of it. I am six months into trying to get my propane tanks upgraded and working with Amerigas is nothing short of ridiculous. I see no end to it. You can't call anyone (automated attendands with no option to talk live); they are designed to not talk to the customers. They will not respond to e-mail and I am very disappointed. I would be out of propane in 1-2 days if I had an outage and that defeats the whole purpose. If it was in the winter, I would have no electricity and then no heat even when the power comes back. If Generator Supercenter would create some way to advocate for response and action from the propane suppliers as a part of the install process. Even if it was an added cost. Maybe things would be different. There has to be a propane dealer that would welcome the additional business created by generator sales.
Date published: 2023-06-14
Rated 5 out of 5 by from Happy Customer I purchased a 48kW Generac standby generator from Auxiliary Power Systems of Remlap, Alabama. Their technicians arrived last month as scheduled for two occasions to: (1) pour the generator slab, and (2) generator installation. Our local utility service was able to run a natural gas line prior to generator installation. The installation itself went well with no issues and has run each exercise cycle as expected.
Date published: 2023-06-13
Rated 5 out of 5 by from Generator Superstore of Annapolis was a great place to work with! Contacted Generator Supercenter to get an idea of what kind and how much a generator might cost for our house. The Sales Rep stopped in and spend a considerable amount of time explaining all the details and doing calculations for “what we’d want to be able to run, simultaneously during a loss of power”. My wife and I were struck by their knowledge and professionalism - and a complete lack of sales pressure. Long story short, we decided to purchase a fairly large generator from them and are very happy with the results. We can now charge both our electric cars, run our entire home and even heat the pool if we needed to. Great experience, great product - super happy customers.
Date published: 2023-05-11
Rated 5 out of 5 by from We love our Generac Our generator came online for the first time last night. The power was out for only an hour or so, but It was so nice to not have to worry how long the power would be off. And not having to start with the portable generator. Our 48 KW ran our whole home. I would highly recommend this unit.
Date published: 2022-12-23
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48kW-RG04845 is rated 4.8 out of 5 by 48.
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Protector Series Accessories

Maximize your investment and maintain your Generac home standby generator with a variety of accessories.