What do I need to know about portable generators?

Normally for the home the inexpesive models run 5500w to 6800w. 12 horse power or so. Be sure to buy one that has a main breaker on the unit and a couple of 20 amp branch circuit breakers. This is best way to go. The 5500 watts is about 45 amps and 6800 watts is about 56 amps. Figure out what you want to power in your home when the power goes off. Add up the amps on each item and plug them into the circuits keeping it at about 80% to 85 % loaded. That is as high as I would go. Be sure to buy an engine that will start when its 0 degrees F outside. Some motors wont pull start in cold to read the literature for operation temps. Buy a transfer switch if you want or just a bunch of good 12awg extention cords. The exfer switch requires an electrician to install usually. So basically you load the breakers to 17 amps give or take an amp or 2. That could be a refridge when its running, your satelite system, TV and a coffee pot. The best way is to get a current meter and check each item running in your breaker panel or read the tags on the items. You might use ohms law to convert watts, amps and so on.