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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 - Comes standard with all Protector Series generators. Mobile Link 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

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 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
Rated 5 out of 5 by from Quality workmanship of product and installation. We had our 48kW Generac installed last week by Auxiliary Power Systems of Remlap, Alabama. The technicians arrived exactly when they said they would and worked steadily in the Alabama heat, including digging a trench from our propane tank to the generator through hard, dry, rock-infested ground. We really appreciated their hard work (and courtesy). They had the generator up and running just fine before they left. It runs much more quietly than I expected and came on right on time for the first exercise cycle. Now, I sit and watch the north hoping for a summer ice storm!
Date published: 2022-07-22
Rated 5 out of 5 by from Error code 2760 How to clear 2760 code? Checked battery condition. It stays good.
Date published: 2021-12-04
Rated 5 out of 5 by from We have only had to use it once but it came on as planned and kept us running. A seamless transition to the generator when the power went out
Date published: 2021-10-16
Rated 3 out of 5 by from Unavailability of replacement parts is a big problem I have a 50kw Generac generator installed in 2007, it has worked pretty well, however recently the alternator on the engine has failed. When I called service to get it fixed I am told that a replacement part is no longer available. They can’t fix it. So I’m left with a generator that is unusable. I can’t recommend Generac generators.
Date published: 2021-04-09
Rated 5 out of 5 by from I love the new model for 2020 I read the other reviews before buying... Its not loud at all. I just love this unit. This is their new model for 2020 and its handling my entire 10k sq/ft house with 4 HVAC units, pool, 100+ external lights, two dish washers, two washers and dryers, and its amazing. We setup setup a few load shedding options but this monster handles it all! So happy I went with the 48KW. I worked with JBI in my area and they were top notch. I owned another Generac generator for a previous house and been a Generac customer for over 8 years now. Absolutely love the customer services and the quality of the product. Highly recommend this unit... and again... its not that loud.
Date published: 2020-04-28
Rated 5 out of 5 by from Best contractors We live out in the country in Virginia where our power can go down for days at a time several times a year. We have for years dealt with All Install who have serviced our prior Generac generator and when we decided to upgrade to power the entire house we turned to them. Eric and Carlin who own the company spent a lot of time reviewing our exact needs and provided several options. We ended up choosing the 48 which was their top recommendation. We were extremely impressed with All Install. The planning and communication was a pleasure and I highly recommend them if you are located in Central Virginia. The unit is very quiet(compared to our old one)and easily powers our whole house.We are very pleased.
Date published: 2020-03-06
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48kW-RG04845 is rated 4.9 out of 5 by 42.
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Protector Series Accessories

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