Originally Posted by Twistzz
Just fyi, I had a champion 2000 inverter and it ran fine below 6000', at altitude it couldn't handle any load well. The Honda's 2000's have altitude kits for different elevations and mine works great 7k feet up and higher.
Just be aware that the higher up you go, the less oxygen there is. All motors (with the exception of turbos, which can compensate) will make less power up high. The concept is called "density altitude" and at 7000 feet, you could be down on power as much as 20% - more if it's hot.
Generators may have carb adjustments (lean) for higher altitudes, this can help with power a bit, but it won't put more oxygen in the air, you're still looking at power loss.