When it comes to backup power, Generac is the first name many people think of. As one of the largest generator manufacturers in North America, they’ve built a reputation for reliability, innovation, and comprehensive standby power solutions. Whether you’re a homeowner preparing for storm season or a business that can’t afford downtime, Generac offers a wide range of generators to fit different needs and budgets.
In this review, we’ll break down Generac’s most popular models, examine their performance, weigh their pros and cons, and see why they’ve become the go-to choice for many when the grid goes down.
About Generac
Founded in 1959, Generac Power Systems has specialized in power generation products for over six decades. They were one of the first to design affordable home standby generators, and today they offer everything from small portable units to massive commercial systems. Their products are widely available, backed by a strong dealer network, and supported with extensive service options.
Types of Generac Generators
1. Standby Generators
Generac’s flagship category, standby generators are permanently installed outside your home or business. Connected to your electrical panel, they start automatically within seconds of an outage. Most run on natural gas or propane and can operate for days or weeks without manual refueling.
2. Portable Generators
Generac also offers a variety of portable models for home backup, job sites, and recreation. These units run on gasoline, and some offer dual fuel capability for propane use.
Popular Generac Models
1. Generac Guardian 22kW Standby Generator
This best-selling standby model delivers 22,000 watts of power on propane (19,500 watts on natural gas), enough to run most large homes including central air conditioning. It’s air-cooled, features automatic transfer, and comes with Generac’s proprietary Evolution Controller for easy monitoring.
- Pros: Whole-home capacity, automatic start, long-term reliability
- Cons: Requires professional installation, high upfront cost
2. Generac GP8000E Portable Generator
Offering 10,000 starting watts and 8,000 running watts, this gasoline-powered portable is a strong option for running multiple appliances or job site tools. It features electric start, a large fuel tank, and covered outlets for protection.
- Pros: High output, portable design, electric start
- Cons: Loud (around 74 dB), heavy at 198 lbs
3. Generac iQ3500 Inverter Generator
A quieter, more compact option with 3,500 starting watts and 3,000 running watts. It produces clean power for sensitive electronics, making it great for camping, RV use, or running small appliances during an outage.
- Pros: Quiet (around 57 dB), fuel-efficient, parallel capable
- Cons: Not powerful enough for large appliances
4. Generac Protector Series 48kW Liquid-Cooled Standby
For commercial or large residential applications, this liquid-cooled generator delivers serious power. It’s capable of running extensive electrical loads and is designed for long-duration use.
- Pros: Massive output, durable design, commercial-grade components
- Cons: Very high cost, requires large installation space
Performance and Reliability
Generac generators are generally praised for their dependability. Standby units are built to start automatically under extreme weather conditions and keep running for as long as they have a fuel supply. Portable models are known for solid engine performance and ease of use.
One standout feature is Generac’s Mobile Link remote monitoring system, which allows you to check generator status from anywhere via smartphone or computer.
Noise Levels
Standby units are enclosed to keep noise down, usually operating in the mid-60 dB range — comparable to a central AC unit. Portable open-frame models are louder, in the mid-70s, while inverters like the iQ3500 are quiet enough for campground use.
Fuel Efficiency and Run Time
Fuel efficiency depends on the model. Inverters are the most efficient, running for 8–14 hours on small fuel tanks. Large portables like the GP8000E can run around 11 hours at 50% load on a single tank. Standby units can run indefinitely on natural gas and for days on large propane tanks.
Maintenance and Support
Generac’s maintenance requirements are straightforward — oil changes, air filter cleaning, spark plug replacement, and keeping the unit exercised (run periodically to stay in good working order). Their nationwide service network is one of the largest in the industry, and parts availability is excellent.
Pros of Generac Generators
- Extensive product lineup for different needs
- Trusted reliability and brand recognition
- Strong dealer and service network
- Standby units start automatically
- Innovative features like remote monitoring
Cons of Generac Generators
- Standby systems require significant upfront investment
- Portable models can be loud and heavy
- Inverters are limited in maximum wattage
Who Should Consider a Generac Generator?
Generac is a great fit for:
- Homeowners who want automatic whole-home protection
- Businesses that can’t afford downtime
- RV owners looking for clean inverter power
- Contractors who need rugged portable units
The Limiting Factor: Fuel Dependency
Even the best Generac generator relies on a steady fuel source. In prolonged outages, gasoline and propane can become scarce. Natural gas standby units avoid this problem but require an active gas line — which may not always be available in certain emergencies.
The Ultimate OFF-GRID Generator
The Ultimate OFF-GRID Generator is an untapped source of on-demand electricity that runs quietly, produces no emissions, and never needs refueling. It’s ideal for powering lights, electronics, and small appliances indefinitely, while your Generac handles heavier loads.
Using both together creates a layered backup power system, ensuring you’re ready for both short blackouts and long-term outages.
The Bottom Line
Generac remains one of the most trusted names in backup power, with a product lineup that covers everything from compact inverters to industrial-grade standby systems. Their reliability, service network, and range of features make them a top choice for homeowners, businesses, and anyone who values dependable electricity when it matters most.
Click here to learn more about the Ultimate OFF-GRID Generator and see how it can work alongside your Generac to give you complete power security.