We tested the peak power consumption of a 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's easier to monitor what power the device is using during each function.
The TS-453B uses an Intel Celeron J3455 which has a TDP of just 10W. Using four drives that only use 5.3W peak power for reads and writes keeps the power demands of the NAS to a reasonable average of 40.6W for writes and 35W for reads.