I have a mining rig (computer using its processing power to calculate hashes in order to eventually be rewarded with cryptocurrency tokens.)
The program I use to mine tells me each time the power consumption of my hardware (basically only the graphics card power consumption) which is around 900 watt stable (it measures it every few seconds.)
I also have a meter which shows me the total power consumption drawing from the mains/plug.
I noted the following discrepancies (or at least I found them to be.)
While my hardware is under the same load (99% +-1%) constantly and my mining program displays the same power consumption (900 watts) independently of the outside temperature while the meter on the plug when it is a warm day shows around 980 watts consumption but at night when it is cold (I keep my rig in a shed thinking that cold would do good in terms of stability and maintaing low component temperatures while under load) the meter on the plug shows more than 1080 watt usage.
Is there something in the circuitry of the meter that could mess with measurements because of low room temperature or do electronics (be it my computer's powersupply or my graphics cards) consumer more energy while operating on low room temperatures?
Note that the mining program power draw measurements are relatively accurate because either in cold or in warm weather if I increase the power consumption of the cards it shows an increased value while the meter on the plug also shows a somewhat proportionally increased value.
EDIT: By cold weather I mean about -5 to 5 degrees C and by warm anything above 12ish degrees.