Purchased the model #6551 22kw system for my new house. Power interruptions in our area are typical and storms can bring outages that last for days. Haven't had a serious outage since installation but the unit cycles once a week for self-check. During installation the unit checked out against a full house load. My four star rating on features is due to the engine noise. Better muffling could help. During self-check the unit runs at a lower rpm and the noise drops by half.

My wife works from home and before generator we when through a period of several power failures. Needless to say this caused problems. After much research I decided on Generac and have no regrets. Installation and setup were simple enough. Luckily God gave me the ability to understand and follow instructions. We've had the generator for about 8 mouths now and only needed one time, but it worked great. Just like it was supposed to. Wish we had it sooner! An excellent investment.

We use this as backup power running on propane. Works fine. My wife was not going to go crank something. It comes on about 10 seconds after a power failure. We have a 22KW unit and it powers everything including a 4 ton HVAC. I love it. Be careful about placement as this is an engine and makes some noise. We have it on the side of the garage away from the house and we can barely hear it. A neighbor installed his (natural gas) and has had problems. Don't have a clue as to why. I just know that mine works flawlessly.

My unit was installed in March 2016. Other than the weekly exercise period, there have only been a few times when the generator kicked in due to loss of power. There has been no problem with almost immediate replacement of power. There has been no failure to kick in. I'm very satisfied and happy with my purchase and dealer/installer.

So far, so good. We have had a couple of short term outages and everything worked as expected. Hopefully we will never have to use it for an extended time but it is comforting to know it is there. We are a retired farm couple who decided to stay in our older home in the country rather than move to town. A little pricy, but definitely worth the piece of mind it provides.

We moved to NC into an area where there are not that many power outages, but having lived through hurricane Sandy and no power for 6 days, we wanted peace of mind for when and if there are some. About 3 months after moving into our new home with generator, there was construction work being done that caused us to lose power. We were it would be back in a couple of hours, 6 hours later, our Generac was humming along nicely. I have read where some owners have had problems during outages. I asked the local dealer about this and they indicated that many don't do the required initial oil change. We are going on close to a year and the generator does its test run without issue.

I kept waiting for a power outage to see if the unit would cycle as it should and it performed perfectly when the outage happened. The unit is the required distance from the house and is barely noticeable when running. BTW: The installation was done by people that knew what they were doing in a very professional manner.

The day after we completed our installation and testing, the power went out due to high winds and storms, withing a few seconds of the power dropping the generator kicked in and we had power once again. The power was out for approximately 2-1/2 hours and when it came back on the generator shut down as expected and is ready for the next outage. Awesome to have such a reliable and efficient product to place peace of mind and a safe feeling up here in the Eastern Upper Peninsula of Michigan where the weather brings ice and snow this time of year. We added the cold weather kit and Mobile Link unit as well just to make sure all is ready.

We purchased the Generac 22 kw Guardian system in October of 2015. I installed it over the next several months as I had the time. A few months later we had a power outage for about 5 hours. When the power went off the Generac powered up in about 15 seconds. Wonderful! I am writing this review 2 hours after our power has been restored this morning January 25, 2017 at 8:45 am. We had a very bad ice storm on January 14, 2017 and thousands of people have been without power. Many still have no electricity as I write this. We gave this generator a very good 10 days and 9 hour workout. My wife and I highly recommend this generator.

So far the unit hasn't been necessary. It comes on automatically for it's weekly 5 minute run. Starts right up and shuts down afterwards. It is a lot quieter than I I expected, like a lawn mower as others have mentioned. Installation was straight forward, the contractors knew exactly what they were doing. Wiring through our attic was iffy because it is so flat up there but they managed. So glad we went ahead and bought it. Feel so much more secure.