I know that last thing we need is another generator topic. I have searched this forum, and the web without an answer at least not the one want to read. After searching in vain I finally located a manual interlock kit for my specific service panel so my search has restarted for an emergency residential generator. I thought I had settled on a Rigid http://www.homedepot.com/p/RIDGID-6-800-Watt-Yamaha-357-cc-Electric-Start-Idle-Down-Gasoline-Powered-Portable-Generator-RD906812B/203183985?N=bx9nZ18gZ4phZ2bctk8Z2bctk9Z1z0z74f%3FNCNI-5#.UqdPSlp3taQ or more likely the http://www.homedepot.com/p/Generac-XG-7-000-Watt-Gasoline-Powered-Electric-Start-Portable-Generator-5798/202048573?N=bx9nZ18gZ4phZ2bctk8Z2bctk9Z1z0z74f#.UqdPplp3taQ. However I a not so sure either will run my Quad Castile without issues. Specifically the THD of the generators. I haven't found what the THD specs. are for the Rigid, but the Generac is listed as >5%, and in other spots it states just 5% THD. Generac does have the XP line, but we are talking over $2000. I understand an inverter generator would do the job, but I want to power more than my Castile. My oil fired boiler also has a lot of electronics, and I need 220v to power my well pump, and a large inverter generator quickly approaches, and some exceed the price of a standby generator. Specifically are there any Quad Castile owners on here that have a non inverter portable generator that powers your Castile ok. Maybe my only route is a used Honda inverter generator, but I imagine used generators could have issues of their own. Any thoughts?