Synology & QNAP NAS Power Supply Replacement Guide – 250W DPS-250AB-44 D for DS1515+ & TS Series
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Product link: https://nadalan-power.com/products/power-supply-dps-250ab-44-d
Is Your Synology or QNAP NAS Having Power Issues? Here‘s Your 250W Replacement Guide
If you own a Synology DS1515+, DS1815, or QNAP TS series NAS (TS-439, TS-459, TS-659, TS-469, TS-669, TS-453, TS-653) and are experiencing power failures, random shutdowns, or simply need a spare power supply, you’ve come to the right place.
Network Attached Storage (NAS) devices use specialized power supplies that are different from standard desktop computer PSUs. Finding the correct replacement can be challenging because these units use proprietary connectors and specific form factors.
This guide will help you quickly identify if the 250W DPS-250AB-44 D Power Supply is the right match for your NAS.
Quick Compatibility Check
This 250W power supply is specifically designed for the following NAS and server models:
Synology NAS Models:
| Series | Compatible Models |
| Synology DS Series | DS1515+, DS1815 |
| Synology SNAP Series | TS-559Pro II |
QNAP NAS Models:
| Series | Compatible Models |
| QNAP 531 Series | 531 dedicated 1U power supply |
| QNAP TS Series | TS-439, TS-459, TS-659, TS-469, TS-669 |
| QNAP TS Series | TS-453, TS-653 |
⚠️ Important: This power supply is a special interface NAS/server power supply. It cannot be used for ordinary computers. Please pay close attention to the interface type before ordering.
Compatible Power Supply Model
| Model Number | Compatible? |
| DPS-250AB-44 D | ✅ Yes (main model) |
💡 Tip: Simply remove your old power supply and check the sticker on top. If you see DPS-250AB-44 D, this replacement will work perfectly.
Key Specifications at a Glance
| Specification | Detail |
| Model Number | DPS-250AB-44 D |
| Power Output | 250W |
| Input Voltage | 110-220V |
| Dimensions (L×W×H) | 150 × 80 × 40 mm |
| Form Factor | 1U Flex / 1U Server |
| Application | NAS, Network Storage, Flex Server Host |
This 250W output provides reliable power for multi-bay NAS devices and 1U server applications.
Connector Configuration – The Most Important Check
| Interface Type | Connector | Quantity |
| Motherboard Power | 24-pin | 1 |
| Hard Disk Backplane Interface | 20-pin | 1 |
⚠️ Special Note: This power supply has a special interface with specific pinouts for NAS hard disk backplanes. Please pay attention to the interface type. This power supply is a special interface and cannot be used for ordinary computers.
Why This Connector is Different:
Most standard computer power supplies only have a 24-pin motherboard connector and SATA/IDE power connectors. This NAS power supply includes a 20-pin hard disk backplane interface that is specifically designed to power the drive backplane in Synology and QNAP NAS devices. Do not attempt to use this on a standard computer.
Physical Size – 1U Flex Form Factor
| Dimension | Measurement |
| Length | 150 mm |
| Width | 80 mm |
| Height | 40 mm |
This compact 1U size is specifically designed to fit in:
- NAS enclosures (Synology DS1515+, DS1815)
- 1U rackmount servers
- Flex server hosts
- QNAP TS series chassis
Why Choose This 250W Replacement Power Supply?
| Feature | Benefit |
| NAS Specific | Designed for Synology DS1515+, DS1815, QNAP TS series |
| 1U Flex Form Factor | Fits standard NAS and 1U server chassis |
| Direct Replacement | No adapter or modification needed – works right out of the box |
| Universal Input | 110-220V – works worldwide |
| Dual Connectors | 24-pin motherboard + 20-pin backplane interface |
| Special Interface | Specifically designed for NAS hard disk backplanes |
| 1-Year Warranty | Protected by Nadalan‘s 1-year return/exchange policy |
| Fast Global Shipping | Air freight to most countries in approximately 10 days |
Compatibility Note:
⚠️ Please pay attention to the interface type. This power supply is a special interface and cannot be used for ordinary computers.
This unit is compatible with:
- Synology DS1515+, DS1815 NAS
- Synology SNAP TS-559Pro II
- QNAP 531 dedicated 1U power supply
- QNAP TS-439, TS-459, TS-659, TS-469, TS-669, TS-453, TS-653
- Flex server host 1U power supply applications
Installation Tips
- Power down and unplug your Synology or QNAP NAS completely.
- Remove the NAS chassis cover – most Synology and QNAP units have screws on the back or bottom.
- Locate the power supply – usually in a dedicated compartment or at the back of the unit.
- Disconnect cables from the old power supply – note the 24-pin motherboard and 20-pin backplane connectors.
- Take a photo of the connector layout before disconnecting – this is critical due to the special interface.
- Remove the old PSU – usually held by 3-4 screws.
- Install the new PSU – secure with screws, then reconnect all cables following your photo.
- Test before closing – power on to ensure the NAS boots properly and all drives are detected.
Frequently Asked Questions
Q1: What Synology NAS models is this power supply compatible with?
Synology DS1515+, DS1815, and Synology SNAP TS-559Pro II.
Q2: What QNAP NAS models is this power supply compatible with?
QNAP 531 dedicated 1U power supply, TS-439, TS-459, TS-659, TS-469, TS-669, TS-453, TS-653.
Q3: What connectors does this power supply have?
1x 24-pin motherboard interface and 1x 20-pin hard disk backplane interface.
Q4: What is the 20-pin connector for?
The 20-pin connector is a special interface for the NAS hard disk backplane – it powers the drive bays in Synology and QNAP NAS devices.
Q5: Can I use this power supply on a regular desktop computer?
No. This power supply has a special interface specifically for NAS and server applications. It cannot be used for ordinary computers.
Q6: What are the physical dimensions?
150mm × 80mm × 40mm (1U Flex form factor).
Q7: What is the power output?
250W.
Q8: What input voltage does it support?
110-220V.
Q9: Is this a genuine Synology/QNAP power supply?
This is a high-quality compatible replacement specifically designed for NAS and 1U server applications.
Q10: Does this work with Synology DS1815+?
Yes – DS1815+ is specifically listed as compatible.
Q11: Does this work with QNAP TS-453?
Yes – TS-453 is specifically listed as compatible.
Q12: Does this work with QNAP TS-653?
Yes – TS-653 is specifically listed as compatible.
Q13: What is the warranty period?
Nadalan offers a 1-year warranty on this power supply.
Q14: How long does shipping take?
Approximately 10 days by air freight. Tax and duty included for most countries.
Q15: Do you offer wholesale pricing for NAS power supplies?
Yes. Nadalan welcomes bulk orders and corporate partnerships. Contact us to discuss custom negotiations and volume pricing.
Still Not Sure? Contact Us
NAS power supplies have proprietary connectors, so compatibility is critical. If you‘ve checked the model numbers but still aren’t 100% sure, don‘t guess. Send us a photo of your original power supply’s label and the connectors, and we will confirm compatibility for you.
Contact Nadalan:
- Email: gc_ds@sina.com
- Phone / WhatsApp: +0086 18062682902
Order today and get your Synology or QNAP NAS back up and running with reliable power!