Qnap Power Supply Unit For SP-469U-S-PSU, Power 250 W, Applied Model TS-469U-RP/SP, TS-470U-RP/SP,VS-4108/4112/4116U-RP PRO+. The 250W Single Power Supply from Qnap is designed to be used with the 1U 4-bay rackmount NAS/NVR. Redundant power supply should be equipped with two units.