Let's count the real data. My average monthly electricity consumption is approximately 710-730 kWh.
This is approximately 24 kWh per day. Like a lot. But I do not consume gas, hot water. The apartment (approximately 120 sq. m.) is all powered by electricity - a boiler, an oven, a microwave oven, a hob, a refrigerator, a washing machine, TVs, a robot vacuum cleaner, several air conditioners and much more.
In total, I need 24 kW / h (this is the maximum value, because in summer consumption drops to about 530-550 kW / h). Or 24 / 8 (daytime hours) = 3 kWh. Now we have available the simplest single-crystal panels British Solar BS-535M-110, this is about 500 W / h at a price of 8300 UAH / 35 (dollar exchange rate) = 237 dollars. To fully cover the need - I need 6 of them. Let 2 more - to compensate for losses and other things. Total 8 x $237 = $1900. Plus additional lubrication - about another 1,500 dollars. Total - 3400 dollars. This is 3400 * 35 = 119000 UAH.
Average cost of electricity consumption = 1250 UAH/month. (again, I take the winter period, the price of 1 kW / h = 1.68 UAH)
Now we consider the payback: 119000/1250/12. It turns out approximately ... 7 years and 9 months.
BUT ! This is a calculation with maximum performance and a noticeable power margin, and secondly, there are state programs that allow you to save up to 50% of equipment costs. The total payback of the project in reality will be approximately 3 years. It seems like a long time, but .. But it pays off, in a quite sane time, and then you just save.
PS. Obviously, someone will ask the question - "where do you hang them in a multi-apartment house ?!", and look slyly
I answer - the format of the panels allows them to be fixed on a common roof!