Due to Covid, I have been living off grid for about a year. I run my generator for 6 hours every 3 days in order to charge my lithium batteries, and it has met all of my expectations. The electric start is great, and I have only used the pull start twice, when it was well below zero. I would definitely buy again. My only concerns are for me, I find the fuel remaining display hard to understand and don't use it. My only other comment is that the spark arrester got supper dirty and clogged up to the point that it made the generator very hard to run. I removed mine and have not had any issues since.

Our review is based on our trial run of this bad puppy. Will be taking it camping in May 2021 for a real trial run. Based on our initial test, this unit was very impressive! Very quiet - even better than the Honda 2200. Connected 1500 watt heater and a heat gun and the inverter had no problem handling the load. Awesome so far. Will make another review after our first camping trip. Stay tuned...

Our power was out for four days and my generator failed. I purchased the GP2500i and filled it with oil and gas. It started on the first pull of the cord. I ran it for the next day and a half to power the refrigerator, TV and some lights. It ran for at least 8 hours on a fill up. I never let it run out of gas but I know it was more efficint than my previous generators.

I purchased this for the same reason as many others. I wanted a reliable power supply for my travel trailer. I also wanted something quiet so others wouldn't be annoyed at camping areas. Set up was simple. Connect the battery, put in the oil and gas and it is ready to go. Started right up and ran smooth and quiet. However, while running, I heard a slight vibration noise that didn't sound normal. After a little investigation I saw that one of the standing frame supports was cracked where it mounts to the base of the unit. (Access door side on the left) I'm certain this is not a manufacturing flaw, rather something that happened during the shipping process. I called the Generac customer support number (On a Saturday during a holiday weekend) and spoke with a very nice woman named Linda. She registered my product and informed me that this is something that would be covered under the warranty. She was able to get me in contact with a local authorized repair shop. I have since contacted them and they have the replacement part on order. Service after the sale is extremely important. I was pleasantly surprised how smooth this process has been to get the repair done.

This generator is almost idiot proof. It came with important extras like tools, oil, and funnel. I read the instructions and watched a 15 minute video. I did exactly as instructed and it started like a dream. I'm a 50+ female and not very outdoorsy. It's not too heavy for me to move so no wheel base needed. I live in an extremely cold climate so now I feel much more secure knowing my little generator is ready if needed. Be sure to keep up on the maintenance schedule which is provided. I bought a cover for it. This is a perfect little generator for someone like me!

I have older version of this unit (G0071171). It was difficult to start when we first got it , but has gotten worse with time. Now, even when unit is sixty degree range it takes 16 pulls of starter rope to start the generator. It has less than twenty five hours running time on it.

I bought this generator less than a year ago. For some reason it used to surge after a few hours of operation. At the beginning started failing after 4-5 hrs of continuous operation, initially a smaller surge, just little variation on the rpm’s but getting bigger to the point of shutting itself down. Lately the problem used to start after only a few minutes of operation. I took it to the authorized service center where they try to fix it. Initially they thought it was a fouled carburetor but to their surprise it was completely clean(I run the gen on marine gas without alcohol plus I add additives) so after getting in touch with technical support at Generac they decide the problem came from the inverter/computer. After replacing the part the generator improve a little bit but the problem was still there so Generac without any complaints sent me a new one. Kudos for their great customer support. I received the new generator 2 days ago and today will be the first time using it in a camping trip, hopefully it won’t have the same issue.

Used it while deer hunting last fall. Nice and quiet. Only problem was that the left side of the case was broken near the bottom. The box that the unit came in was in perfect shape when I opened it so I feel that the damage was done before it was placed in the box. Other than that I love the unit.

We are the owners of J&G's Place 2B, a bed and breakfast in Ripon, WI. A massive storm hit Ripon and surrounding areas on July 28, 2021 and shortly after midnight we lost power during the middle of EAA Airventure, when Oshkosh hosts the world's largest airshow for a week. This is also the busiest week of the year for our business. A requirement for a bed & breakfast license is that you MUST HAVE HOT WATER, otherwise you are to close immediately. We were looking at a couple of thousand of dollars of lost revenue if we could not stay open. I got out our Generac 3500IO for the first time, a bit worried about making it work. It took all of ten minutes to set up (put in oil and gas and run our extension cords) and it was easy to use (started on the first pull) and kept our business humming and our guests happy for the two days it took the electrical crews to restore service. It already comes with the oil you need for the oil reservoir. Took about half of the included bottle to get it to the right level. It was nice not having to hunt down a bottle of oil. Ran all night and more on one tank of gas, so it is efficient. Especially impressed with how quietly it runs. One thing I would love to see: is there a wheel & handle kit available for this model, and a rain canopy/cover I could buy so it is easier to transport and also be able to use it in the rain? Thank you, Generac, for saving our business. Best, -Jason & Giselle PS: Using two extension cords plugged into the two outlets on the generator, we ran two refrigerators, a chest freezer, a natural gas hot water heater, two lamps, and 2 CPAP units, and had some Watts to spare, plus we charged phones and tablets through the 2 USB ports on the back of the generator. We buy the most energy efficient appliances available, which means we were able to get by with a much smaller and less expensive portable generator that will fit in the back seat of a Toyota Corolla when it is boxed up, which perfectly describes the 3500IO. We recommend it highly!

I just purchased a IQ3500. The unit came with everything needed less the gasoline. I read the manual and filled the unit with the provided oil, added 100% gas and fired it up. It started immediately and ran great. Ultra quite and very smooth. I plugged in some lights for a lite load and ran it for 1.5 hours. I shut it down and checked the oil level. I am very happy with my purchase. This is my second Generac generator that I own. My older one is an 11 year old 7500 watt and still runs like new. Thanks for building reliable products!