docs(hardware): Add section about power usage

docs/src/hardware/nas.md

@@ -20,3 +20,7 @@ To install the additional parts, you'll have to open up the chassis. Then instal
 <iframe width="100%" height="762" src="https://www.youtube-nocookie.com/embed/4LS7gbIB064" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
 
 Further, in order to install TrueNAS, I recommend to remove the pre-installed USB drive from Terramaster installed on the inner side, that contains the Terramaster OS, unplug it and store it, in case you want to send back the device.
+
+## Power usage
+
+In my tests with no, but just test workload, the average power usage of this NAS was 31W idle using TrueNAS Core, with peaks during usage to up to 39W when having disk activity. During boot up there were some further peaks, I didn't record any further. There is a "natural" boundary of 90w due to the included power supply.

docs/src/hardware/node.md

@@ -17,3 +17,7 @@ In order to setup the device, install the additional RAM in the underside of the
 <iframe width="100%" height="762" src="https://www.youtube-nocookie.com/embed/M1EL8yYe_0s?start=292" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
 
 [Hardware Maintaince Guide](https://download.lenovo.com/pccbbs/thinkcentre_pdf/m75q_gen2_hmm.pdf)
+
+## Power usage
+
+In my usage of these machines, my tests resulted in a power-usage of 15W on average, however, they can peak notably higher, when full performance is required. Given they run on a 65W power supply, there is this "natural" limit.