I don’t have any experience with generators, but would like to buy one. The best information on generators is at ConsumerReports.org. However, you have to be a member to get into their site. But once there you can figure out what wattage your appliances require, and they can recommend what would be best for you. Go to ConsumerReports.org
Here are some other articles about generators.
Consider Getting a Generator For Backup Power .html
How to Buy the Right Backup Generator for Your Disaster & Budget
On average, a 250-gallon propane tank fueling a 7 kW standby generator would provide enough electricity to power a home for five days, while a 500-gallon underground tank would provide power for 11 days.