I agree with Tim on generators...but it cost a lot less to get APC back ups..I know tons of companies and people that use these and it works very well...when you get a power outage it gives you the proper amount of time to shutdown your computer or disconnect whatever...in your case it will store enough power to power your incubator

http://www.apc.com/products/category.cfm?id=13

but a generator would work great too