And there you have it. The capital expense and continuing maintenance… to provide enough power to make toast.
This kind of makes my point. The cost of the electricity to make toast – provided on a pretty reliable basis to your home continuously – is in the neighborhood (depending on your neighborhood) of about 7¢ to maybe 20¢ per kilowatt-hour. What that means is: 1000 watts for 1 hour. Your toaster may draw 1000 watts (maybe), but it probably doesn’t take an hour for you to make toast in it, does it? So… figure maybe a nickel to make your toast in the morning. A nickel.
And for that, you want to pay hundreds of dollars (at least) to buy a generator and wire that back to your home system? It’s not a wise investment. No return. It’s not impossible to do, it’s just not a smart thing to do.
——
The problem with “backfeed” is exactly what you’d be attempting to do if you become a co-generator (like your local power generation company) to send power back through your meter (turning it backwards, and thereby selling power back to the utility company). When the power to your home fails from time to time, the utility workers who come to fix the problem (usually at the street, such as to replace a blown transformer or repair a downed electric power line) turn off the power to the lines which the utility company would otherwise have energized. Note the emphasis: they can only turn off the power supplies that they know about and can control. If they don’t know about the power generation going on at your home or facility, and being wired back to the street, and if they don’t have a way to turn that off, then they are at high risk of electrocution when they start to work. So the power company has very stringent rules about who may put power back out to the street, and the type of equipment they use to regulate that (at the power board for the house or business, and not at the wall outlet), and how it is installed and maintained.
All to save a nickel a day?