I actively visit and even live for weeks in a country house in the summer, so I am not afraid of thieves and other elements with low social responsibility at this time. But in winter, spring and autumn, visiting the house is sharply reduced.
In order to discourage irresponsible citizens from entering my territory, I installed lighting in the house that works automatically. That is, he installed a photorelay that works with the sunset and turns on the spotlight. At dawn, there is a power outage and the light is turned off.
In order not to get into significant additional expenses, I preliminarily calculated all the costs. I will say right away - the cost of electricity spent is negligible. Here are my calculations.
I took the operating time of the spotlight to the maximum - 12 hours. In fact, he works a couple of hours less. The power of the spotlight is 30 watts.
- We multiply the power consumption by the operating time and we get 360 watts per day.
30 W x 12 h = 360 watts
- Accordingly, a month of operation of the light source will cost 10.8 kW.
360 W x 30 d = 10800 W = 10.8 kW
- One kilowatt of energy costs about four rubles. We multiply the monthly expense by this amount and get pathetic 43.2 rubles per month!
10.8 kW x 4 rubles = 43.2 rubles
An incomplete fifty rubles a month for a certain security is quite inexpensive even for a pensioner, but for a working person it is generally free.
It is especially pleasant that when we sometimes come to the house or leave it at night or at dusk. With working lighting, it is much more convenient and comfortable to do this.
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