Entertaining mathematics of two-tariff meters or Attraction of unprecedented generosity from Energosbyt

When the benefits of our grandmother-beneficiaries were once again cut, I again thought about the energy efficiency of the apartment. It would seem, much further: all the lamps are replaced with economical ones (thanks to lamptest!), The only “pear” of incandescent light is tied to a motion sensor, the meat is defrosted in the refrigerator, two dishes are cooked in the oven ... in general, there is plenty and good air.
“But there is no limit to perfection,” I thought, once again looking at the banner from the Mosenergosbyt website, offering to switch to multi-tariff accounting ...

Interestingly, to switch to two- or even three-tariff electricity metering, I personally do not need to change the meter. The model installed for the last time is "able" to count separately. It seems to be enough to write an application to Mosenergosbyt, pay for the “flashing” of the counter (the amount is symbolic), wait for the changes to be made to the personal account and enjoy life. For those who have an old counter, all the music will cost more - about 4000. But they promise 25% savings!

Here I turned on my inner Rabinovich and came to very interesting conclusions. IMPORTANT! All of the following are related to my habits and lifestyle. If you weld fittings at night or smelted aluminum at home - everything will most likely be different.

To start, I looked at the rates. For a resident of Moscow, preparing cabbage soup / borsch on an electric stove, a kilowatt hour with a single tariff accounting costs 3.52 p. If we take two-tariff accounting, a kilowatt hour at night (from 11 pm to 7 am) costs only one ruble . It would seem that here it is a freebie - take it and use it. But after reading the tariffs to the end, I was not so happy anymore. The fact is that a kilowatt hour in the afternoon (with two-tariff accounting) costs DEAR than a one-tariff - 3.90 rubles against 3.52.

Down with emotions, let's count.
For simplicity, we assume the consumption of constantly working consumers (refrigerator, freezer, router, home server ...) that does not change during the day.
I try to go to bed at 23-00. Moreover, persons with a sensitive dream, to which I belong, do not like to sleep to the accompaniment of a washing machine and dishwasher. Even if they are in the kitchen, and I am in the bedroom. Well, God bless him, we believe that at 23-01 we cut down all the available equipment with a delayed shutdown, put the chicken to fry, baked bread and went to bed joyfully. In the meantime, I note that all automatic programs will be completed no later than two hours later . Even the longest with soaking, etc. Thus, out of eight hours of valuable nightly tariff, we use only a quarter.

Suppose we spent X kilowatt hours per month on these manipulations after 23-00. The rest of the consumption (daily), let it be Y. Regular consumers (refrigerators / routers) - Z.
For a month with a two-tariff accounting system we will pay: X * 1 + Y * 3.9 + Z * 0.33 * 1 + Z * 0.66 * 3.9 (rubles)
The same consumption with a single tariff: (X + Y + Z) * ​​3.52 ( rubles).
We are interested in the ratio of X to Y, the scale will tip in our favor. According to the mind, it would also be necessary to tie up Z, but the calculations will be too complicated. Therefore, we make a voluntary decision that my refrigerator, freezer and router with a server consume ... well, say, 40 kilowatt hours per month.
Thus, the task is reduced to comparing two functions:
F = X + 3.9Y + 116.16 and F '= 3.52X + 3.52Y + 140.8
Run your favorite Excel and get (the table shows the ratio of F to F', that is, a two-tariff system to a single tariff Accordingly, where the value is greater than one - there the two-tariff is more expensive, where less than one - it is cheaper there):

Explanations for the picture: in the left column - the ratio of night to day consumption (in percent). Above is the size of daily consumption (it affects rather weakly, but since I entered it in the table, then God bless him).

What is the bottom line? In relation to my realities, it makes sense to switch to double-rate accounting only if in the evening / night I will haul 10-15% or more of the daily electricity consumption.
It seems to me unrealistic. In a month I “eat” about 600 kilowatt hours. Only washing (1 kilowatt hour per cycle, every three days = 10 kilowatt hours) and washing the dishes (daily, one and a half kilowatt hours per cycle = 45 kilowatt hours) can be carried overnight. Total we have 55 "evening" kilowatt hours, that is, less than 10% of monthly consumption.
That is, I am near the breakeven point, and if I add the preparation of morning oatmeal in a slow cooker, I can even profit. But, as I already said, a washing machine with a dishwasher prevents me from sleeping, and then Mosenergosbyt can pay ... In general, well, what the hell.

Yes, the main purpose of the post is to express surprise at the fact that the daily rate in the two-tariff system is higher than the single tariff. Of course, it is understandable - the economy, profitability, all things ... But somehow it’s all the same strange ...