Does someone know what would it be the medium cost on the electricity bill of having the raspberry pi 4 switched on on almost every moment of the year?
I have listened that the cost of the raspberry pi is very low, but I want to know a medium cost so I can make an idea
Actually, I'm running 2 python scripts, mysql, and apache.
Thanks a lot
This answer requires only that you know your local energy costs, your RPi's rate of power consumption, and simple math.
Electrical energy costs vary considerably by season and by location. Since you didn't tell us where you live, we'll use this source's estimate of world average price of 0.14 U.S. Dollar per kWh for households.
Since you didn't tell us how much energy your RPi consumes, we can use the RPi Foundation's estimate of 600 mA for "Typical bare-board active current consumption" for the RPi 4.
In the dc case, electrical power ("P") consumption is the product of voltage, and current:
P = V * I
Energy ("E") is the product of power and time (or the integral/sum over time if power is not constant during the time period of interest):
E = P * T
And that leaves only the multiplication and conversion of units to obtain the annual Cost ("C"):
C = 5 volts * 0.6 amps * 24 hrs/day * 365 days/year * $0.14/kwh * .001 wh/kwh
C = US$ 3.68 per year
To put that in the form of a range of values based on data from this source:
US$ 1.58/yr < C < US$ 9.20/yr
A power calculator below, a Pi on its own can only use 15W (3A x 5V) maximum or 17.5W with 3.5A power supply like I have. Put them numbers in this with your electric rate, I got $54.31 when using the 24 hours a day for 20W at 31 cents (the default rate) a kw/h. Since my power rate is under half of that I am doing good, I allowed extra for the spinning hard drive and SSD attached to it to get the 20W used. That would be all of those items running flat out maximum load, sitting like it does mostly idle it will be way under this worse case usage.