Read the statement by Michael Teeuw here.
Measuring power/energy cost on a 24/7 running pi
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@sdetweil you really pay only 8 Dollar-Cent per kw/h? We have to pay 25 up to 32 Euro-Cent in Germany:-( That are round about 29 up to 38 Dollar-Cent.
@merek it will be less, I think, but it depends what the pi is doing. The power supply sdetwel described can deliver 36 watts, but it is not needed the whole day. Different Websites say between 12 and 20 Euro a year for the pi…the costs for screen will be much more.
What you can do is to choose an other RPI-modell and/or deactivate functions you don’t need on the board (Ethernet, USB) …and buy a screen you can turn off by MM.
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@thgmirror said in Measuring power/energy cost on a 24/7 running pi:
@sdetweil you really pay only 8 Dollar-Cent per kw/h?
yes, and I am unhappy as I had to renew my plan this year and it went up from 6.5c/kwh to 8c/kwh
they have plug in power monitors you can then examine actual usage, like this
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@merek Btw. it will not be possible to messure the amount with an ammeter. It is too low to be detected…OK, my ammeter is not able to do it…
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ah, just saw that Sam recommended an ammeter…this may work, mine (another one) not.
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If you are looking for some code to disable the monitor or if you want the use an infrared sensor to detect when someone is in front of the mirror and only then turn it on, you can check my module https://github.com/thobach/MMM-Gestures.
