Many people in the UK, Netherlands, Germany, etc. And even some further north have done the math and it comes up positive.

You have to be realistic of course. There are a few months in the winter where they don't perform well and returns drop well below a single kwh of power. But then you might start getting some bright winter or early spring days and you go back to getting many kwh per day worth of free power as early as February or March.

It's better if you have a battery and if your local energy supplier has favorable contracts.

Long term storage seems to be a be a hobby horse that comes up in a lot of theads like this. The reality with batteries is that the overwhelmingly vast majority is for dealing with short term supply/demand fluctuation. The supply spikes are as important as the demand spikes here. Empty batteries can absorb those.

Anything beyond four hours drops off rapidly in terms of economics. And a few hours is all most energy companies need for planning to spin up or down gas (or coal in some cases) plants or decide to import/export power via cables.

As for nuclear, it's is a lot less flexible and very expensive. And in any case very little of it is coming online for the foreseeable future (next 1-2 decades). We'll get probably quite a few TW of battery, solar, and wind deployed over that time. Nuclear is going to be a rounding error on that even in the best case.