I put one of these in my 18-Wheeler and am very happy with it. I use it to charge my batteries when at a 'sure-power' station, and at home, and it provides 120volt power when not plugged in to an outlet. Having constant 120v power in my truck is fantastic, and I run a bunch of ham-radio gear (HF and VHF) off this thing as well. Although not completely pure sine-wave, there are NO 'birdies' or noise issues from any of my radios on any band, so thats great, but this thing is definitely NOT pure Sine-wave. I have a couple of laptop and cell-phone chargers that do not like the power this thing provides, and will refuse to operate when plugged into it. As far as 'Power', All i can say is 'WoW'! It definitely has no issue with providing power, and a lot of it. Microwave, computers, 1/2" drills, I have even used a big shop-vac with it. The battery conditioning cycles it does when plugged in have definitely extended the life of my truck batteries, so that is good too. I installed a 250-AMP leese-neville alternator on my truck to go with this thing, and the alternator barely gets warm when using A 900watt microwave.