Generator Fuel type: Natural Gas, Propane (LP), and Gasoline
Gasoline
Gasoline generators are the least expensive type and are available in the low to medium power range. They are best suited to occasional use. The main limitation is the size of the fuel tank. Most gasoline generators can only run for about 8 hours before the tank needs to be refilled. The other problem with gasoline is that the gas starts to go bad after about 3 months. You can't leave gas in a generator that is only used once per year since the gas will degrade and clog up the generator.
Examples of Gas Generators from 2,000 to 7,500 watt:
Natural Gas and Propane (LP):
Many natural gas (CNG) and propane (LP) generators can use either fuel. Some are portable but most are meant to be installed. There is a limited selection of portable natural gas and propane generators. The portable Generac LP model shown below is a very nice product. It is rated for 6,875 watts and takes up to 30 pound propane tanks. Propane can be stored indefinitely in tanks and never goes bad making it a better solution than gasoline. The CorePower model is 7,000 watts runs on natural gas or propane and comes with an automatic transfer switch and can turn on instantly in case of a power outage.The Guardian is 20kW and can power most homes. All of of these models get great reviews.
Tri-Fuel Generators (Gasoline/Natural Gas/Propane):
Tri-fuel generators are flexible, they can take any of the above fuels. That makes them very useful in emergency situations. Lets say you are planning on using your natural gas hook-up and there is an earthquake, damaging the gas supply. You could always use gasoline or store propane tanks as a backup. If it is portable, you could take it with you if you need to leave your home. They are often more expensive and can be finicky if not built right.
I prefer Winco models. Examples:
Winco 8,000 Watt TriFuel Power System w/ Electric Start B&S Vanguard Engine $2,788 on back-order as of 7/23/2013
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