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.
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It sounds like you need solar panels with some power storage enough to charge during day and provide power through the night for summer, and then the generator for winter, but use it not just for its heat but also electricity (portion of heating would be provided with IR emitters powered with electricity). That's from layman perspective - I have no idea what I'm talking about :o)
The thing is, every system costs money. Sure it would be cool to have many options, solar, wind and even a water turbine if you have a creek. But who can afford all that?
The power-heat coupling system was also not cheap, but still reasonable in price. 10 grand or so, some years ago. That was without the heating radiators in the house, which usually already exist from the previous heating system. And yes, surplus electricity could be used for heating, thats fairly cheap to do.
Yes the windmill to offset the cloudy days is a good thought. I've also really wanted to tap the hydroelectric capability of the creek we have running through the property. It runs steady all year, even under the ice when it freezes over the top. No idea how much those cost or how much power it could produce. Interesting concept though, because it's always running clouds or sun.
The output of a water turbine can be substancial, even if its not a big water flow. Unfortunatly also the investment neccessary is substancial, if its done properly. And there is the question of a permission, since you do interfere in the natural water flow. I don't know how they handle this in your region.
But of all the renewable energy options its sure the most efficient and reliable one.