Just ran into this video where the host explains how he's using a home server and how he made it use under 23W, and the steps he took to make it quiet and efficient.
So, knowing that our servers are not comparable I wanted to check how much power my server used.
First let's look at MAXIMUM power draw for all components.
- Computer (Radxa Zero): 900 mA at 5V
- HDD: 500 mA at 5V (x2)
- Network USB adapter: 500 mA at 5V
There is also a USB 3.0 hub there but the power usage is negligible, probably below 100 mA at 5V.
So, the maximum power usage is ~2400 mA at 5V, which is about 12 watts.
When more or less idle, measured with a USB thingie, the Radxa Zero uses ~200 mA and the Network adapter never seems to go above 150 mA, so a lower bound is maybe about ~1300 mA, or about 6 watts.
And then there's cost. My whole system (which does everything I want nicely AFAICS) costs under 100 dollars. And my power bill from it is, if it runs full throttle ALL THE TIME (it doesn't) ... $87
Mind you, that's 87 argentinian pesos, or between 50 and 25 USD cents, depending on your exchange rate.
I think I'll manage.