I don't know if I'd break even in my lifetime, or if we get enough sun to make it worthwhile. (This month has been the sunniest March on record, so far, though!) I'm thinking more of a self sufficiency thing. When we lose power, it can be for days at a time.
Though it might happen in a very cloudy, stormy stretch of weather, in which case, wind power might be a better option...

Don't get me wrong, I am very pro Solar energy. It is just that I'm 60 years old, and a 30 year payback on a Solar investment.... well, you can do the math. If I were a much younger man, then I would be looking into the advantages of Solar, even where I live.
Depending on where you live and how much you pay for energy, sometimes you can get your breakeven point down to less than 10 years. My electric company charges $0.12 per KWh normal rate, but I also have off-peak electric which costs me $0.06 per KWh. It would take a long time for a good Solar system to pay for itself where I live. And did I mention that we are under snow almost 6 months of the year? That could mean a lot of cleaning off the snow required of the Solar panels to keep them working in the winter. So we don't have any solar systems on houses anywhere near where I live.
If we went days without electricity, we could not survive our winters. Just look what happened down in Texas a few weeks ago when they hit freezing temps. Where I live, we call those temps an early spring. But, of course, if we lost electricity, we too would be freezing at home, the pipes would break, and we could be looking at major losses.
I, too ,would be looking at other off grid type options if we lost electricity for days at a time. Certainly wind and Solar systems. Most definitely a good gas/diesel generator. Probably a wood burning or pellet stove to heat the house. Some people have installed wall mounted propane heaters, which require no electricity for operation. I have one in my 3 car garage. They work great, but since they are not vented to the outside, you build up humidity.
Those wall mounted propane heaters are not rated for inside the house if you live in our town. From what I hear, it is not a question of safety. Those propane heaters are so efficient that the local electric and gas companies worked together to ban them via local ordinance as heating options for the house. But, out in the country where I live, some people have them installed in the basement as backups. We can get them for under $200 where I live.
wall mount propane heaters