The problem with solar panels, and also wind energy, is that its not a steady supply. So it can always only be a add on to a steady power source, since electricity is not a luxury that you only consume from time to time. And a sufficient storage of power quickly gets really expensive.
I am however also sceptical about generators with combustion engines, since they need a lot of maintainance. And even then there is no guarantee that they dont suddenly give up their ghost - preferably at the least conveniant moment.
Some years ago I had a look at a system that was called power-heat coupling. Basically a pretty good idea: it was a sturdy industrial Diesel engine driving a generator, and its coolant was used to heat a house. This way you can make the most of the fuel that is used. But the devil is in the detail once more. For example, in summer you dont need the heat, but you do still need electricity. And in winter you need a lot of heat, but not always the full generator capacity. So its rarely operating in the optimal window.
I guess there is not really a cheap and easy solution, especially if you live in a northern country. Soon daylight will reduce to 6-7 hours per day, and often enough even without any sunshine. Solar panels are pretty useless then. Wind may be the better option even, but that also depends where you live and the weather there.