Replacement power supplies and adapters QNAP lists per model. Sorted by how many NAS models each is listed for.

PartNAS modelsBuy
QNAP PWR-ADAPTER-65W-A0131Amazon eBay
QNAP PWR-PSU-770W-DT0122Amazon eBay
QNAP PWR-PSU-250W-DT0221Amazon
QNAP PWR-PSU-450W-DT0112Amazon eBay
QNAP PWR-PSU-550W-DT0111Amazon
QNAP PWR-ADAPTER-120W-A0110Amazon eBay
QNAP PWR-PSU-300W-DT0110Amazon
QNAP PWR-PSU-300W-DT0210Amazon
QNAP PWR-PSU-100W-DT018Amazon eBay
QNAP PWR-PSU-250W-DT037Search Amazon
QNAP PWR-PSU-550W-FS027Amazon eBay
QNAP PWR-PSU-800W-DT017Amazon
QNAP PWR-SET-DT04-0017Search Amazon eBay
QNAP PWR-ADAPTER-60W-A016Amazon eBay
QNAP PWR-PSU-250W-DT046Amazon eBay
QNAP PWR-PSU-450W-FS016Amazon eBay
QNAP PWR-PSU-320W-FS015Amazon
QNAP PWR-PSU-350W-FS015Amazon
QNAP PWR-PSU-550W-HN015Amazon eBay
QNAP PWR-SET-DT03-0015Search Amazon
QNAP PWR-ADAPTER-65W-A044Amazon eBay
QNAP PWR-CG-DT04-0014Search Amazon
QNAP PWR-PSU-350W-DT014Search Amazon
QNAP PWR-SET-DT044Amazon eBay
QNAP PWR-ADAPTER-48W-A013Search Amazon eBay
QNAP PWR-ADAPTER-90W-A013Amazon eBay
QNAP PWR-PSU-250W-DT013Amazon eBay
QNAP PWR-PSU-350W-FS023Amazon
QNAP PWR-PSU-750W-CW013Amazon eBay
QNAP PWR-ADAPTER-65W-A022Amazon
QNAP PWR-ADAPTER-96W-A022Amazon
QNAP PWR-PSU-250W-DT052Search Amazon
QNAP PWR-PSU-700W-S012Search Amazon
QNAP PWR-ADAPTER-120W-F011Amazon eBay
QNAP PWR-PSU-1100W-FS011Search Amazon
QNAP PWR-PSU-2000W-FS011Search Amazon
QNAP PWR-PSU-500W-CW011Search Amazon
QNAP PWR-PSU-700W-FS011Amazon
QNAP PWR-SET-550W-FS021Search Amazon