These generators are good for running power tools on a remote construction site, powering lights and so forth not powering your house.
The output from them is very poorly regulated (if at all) and thus your feeding all that nice sensitive stuff in your house with very dirty power. Think of all your appliances, TV, computers, they can't handle it never mind your furnace or well pump. In some cases these devices simply will not work if the power in falls outside a set of parameters but I wouldn't put much trust in that protection usually you find out when stuff goes boom unless you put something in between to clean up that power which would easily off set the perceived savings here.
There are portable generators that are designed for this purpose but they are significantly more expensive because the components necessary to give you good clean stable power cost more.
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