Wal-Mart does sell power generators and they start at around $100 but the price will depend on the size of generator you need. A quick search on Wal-marts website should give you a better idea of their available products.
A backup generator is used in cases of electricity power outages. The generator can be connected to your electric service and will power the electricity for a number of hours. To hook up a backup generator it would be advisable to hire a professional electrician.
There are many places you can find a generator if you want to keep it quite low on the price I would check lowes, home depot, craigslist or amazon. A backup power generator is an extra source of power so if someone runs their power off of a generator and it goes out they will have another one to use.
solar power with a backup generator
Ron Hazelton made a great video about how to install a backup power generator correctly and what to check when it is not working properly. Here is the link: http://www.ronhazelton.com/projects/how_to_install_a_home_generator_for_emergency_power
A gas generator generates electricity and can be used as a backup in a power outage. I am not certain what you mean by an electric generator. If there was a power outage, how would an electric generator work?
A backup generator keeps you out of trouble if the power goes off in your neighborhood. You can temporarily use a generator to run your appliances so that you have light, a refrigerator and other important functions needed on a daily basis. Make sure that you buy a backup generator that is the right size for your needs; it might be necessary to estimate the amount of power that you need before you go shopping.
A backup generator is used in cases of electricity power outages. The generator can be connected to your electric service and will power the electricity for a number of hours. To hook up a backup generator it would be advisable to hire a professional electrician.
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You can start by reading wikipedia's description of a backup generator system. Basically it is run on gasoline and can provide your home with electricity during a power outage.
gasoline or diesel fuel
Having a backup power generator can really take a load off of your mind if you live in areas that are prone to the power going out. They are also a great comfort even if you live in an area that is not prone to power outages. If the power were to go out for an extended period of time, your refrigerator could become a mess of spoiled food. This alone makes a generator worth the expense.
In order to install a backup power generator at home you should visit a how-to site or video site that provides you with step-by-step directions. A good and safe video is this one: www.youtube.com/watch?v=Fj1lxtHpArE