We tested the peak power consumption of the NAS at the wall during a run of CrystalDiskMark 5.0.2, as this version of the benchmark runs the read and write benchmark suites separately so it is easier to monitor what power the device is using during each function.
Intel's 14nm Celeron J3455 quad-core has a TDP of 10W so with a careful choice of hard drives the TS-453Be power demands can be kept reasonably low. However, adding a 10GbE card to the mix adds quite a chunk on the power consumption figures.