Hello Guy and thank you for your question. I am Designing Woman from The Community.
The GE 10KW Home Standby Generator - Whole House Managed Power can ONLY be installed outdoors.
Page 9 of the Installation and Start-Up Manual gives location guidelines:http://www.homedepot.com/catalog/pd...
The unit should be situated in a prepared location that is flat and has provisions for water drainage. Since rising water and potential flooding may be a potential hazard to the operation of your generator, can you install the unit on a raised concrete pad? Alternatively, a platform can be constructed and the unit installed on top to support its weight (350 pounds). For raised heights, you may need to electrically ground the generator to a ground rod in accordance with local codes.
Best wishes on your project.