Home generators can be portable or stationary (standby). They run on a variety of fuels, such as gasoline, diesel, natural gas (NG), and liquefied petroleum gas (LPG). Each type has its pros and cons.
Portable gas models are relatively cheap. However, such devices have short run time: you would need to refill their tank several times a day if you run them continuously at rated load. In addition to this, they are not suitable as a long-term power backup since gas pumps may not work during a wide spread blackout.
For a long term emergency, consider standby sets. They can provide continuous power because they are hooked up to an external fuel source, such as natural gas line. Some portable devices can also be fueled from an external source and can therefore provide extended run time too.
The main differences between portable and stationary sources are in the connection and activation. A portable device has to be rolled out from the storage, filled with fuel or hooked up to a fuel line, manually started, and connected to your loads. A permanent standby generator by contrast is already connected to both the house wiring and the fuel source. Therefore, it can start immediately either by a push of a button or automatically. Automatic systems have an auto transfer switch. It can sense a power outage, isolate your electrical wiring or designated emergency circuits from the grid, and start the genset. When power is restored, such a system will connect you back to the utility lines and will turn itself off. You don't even have to be at home to activate it.
For more information on Carpenter Electric's Permanent or Portable Emergency Standby Energy Generators Florida products and services, please call 561.848.7881