Honda 3000is generator

I normally use two Honda EU2000i generators in parallel to run my 15K A/C, but I was using the employers Honda EU3000 last fall. Even though it is quite old (many hours)it started and ran my AC just fine, as well as my Heat Pump when I used it. It also runs my microwave easily. The only issue I can see would be if there was a problem with either the A/C or the Generator, or the microwave was on at the same time. It was also quieter while running the A/C that the two smaller gens running together.