My OWC ThunderBay 4 mini on a MAC studio is equipped with 2 x Samsung EVO 870 4TB and 2 x Samsung EVO 860 2TB.

Hard Drive (4 x SSD)

Start up (Mount): 18.5W

Drive active (Write one file): 17.5W

Drive idle: 13.4W

OS Sleep: 6.7W

Manufacturer stated that in limited testing, the OWC ThunderBay 4 mini was found to draw power within the ranges shown below. Please note that within each category, the amount of power drawn will vary slightly based on drive manufacturer and model.

Hard Drive (HDD)
Start up: 21.5W
Drive active: 19.5W
Drive idle: 11W
OS Sleep / Hibernation: 0W

Mercury 6G SSD
Start up: 15W
Drive active: 21W
Drive idle: 9W
OS Sleep / Hibernation: 0W