Synology & QNAP NAS Server Power Supply Replacement Guide – 250W DPS-250AB-44 B Compatibility
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Product link: https://nadalan-power.com/products/250w-dps-250ab-44-b-server-power-supply
Is Your Synology or QNAP NAS Having Power Issues? Here‘s Your 250W Replacement Guide
If you own a Synology NAS (DS1815, DS1515, DS1511, DS1517, DX513) or a QNAP NAS (531 series) 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 B Power Supply is the right match for your NAS or server.
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 | DS1815, DS1515, DS1511, DS1517 |
| Synology DX Series | DX513 (expansion unit) |
QNAP NAS Models:
| Series | Compatible Models |
| QNAP 531 Series | 531 dedicated 1U power supply |
Server / Host Compatibility:
| Type | Compatible |
| Flex Server Host | 1U power supply compatible |
| 1U Server PSU | Standard 1U form factor |
⚠️ Important: This power supply has a special interface and cannot be used for regular computers or standard ATX motherboards. It is specifically designed for NAS and 1U server applications.
Key Specifications at a Glance
| Specification | Detail |
| Model Number | DPS-250AB-44 B |
| Power Output | 250W |
| Input Voltage | 110V-220V (Universal) |
| 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, ensuring stable operation for your data storage and network server needs.
Connector Configuration – The Most Important Check
This power supply uses a special interface specifically designed for NAS and server motherboards. Do not attempt to use this on a regular computer.
| Interface Type | Connector | Quantity |
| Motherboard Main Power | 24-pin | 1 |
| Special Interface | 12-pin | 1 |
| Additional Power | 8-pin | 1 |
⚠️ Special Note: This power supply has a special interface with specific pinouts for Synology and QNAP NAS devices. The 12-pin connector is proprietary and not found on standard motherboards. Please verify compatibility with your specific NAS model before purchasing.
Physical Size – 1U Flex Form Factor
This power supply uses the standard 1U Flex form factor, commonly used in:
- 1U rackmount servers
- Flex server hosts
- Compact NAS devices
- Small form factor network appliances
| Dimension | Measurement |
| Length | 150 mm |
| Width | 80 mm |
| Height | 40 mm |
This compact size is specifically designed to fit in tight server chassis and NAS enclosures.
Why Choose This 250W Replacement Power Supply?
| Feature | Benefit |
| NAS & Server Specific | Designed for Synology DS1815/DS1515 and QNAP 531 |
| 1U Flex Form Factor | Fits standard 1U server and NAS chassis |
| Direct Replacement | No adapter or modification needed – works right out of the box |
| Universal Input | 110V-220V – works worldwide |
| Multiple Connectors | 24-pin + 12-pin + 8-pin for complete compatibility |
| Quiet & Reliable | Designed for 24/7 operation in NAS and server environments |
| 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:
⚠️ This power supply has a special interface and cannot be used for regular computers. Please verify the 12-pin proprietary connector matches your Synology or QNAP NAS motherboard before ordering.
This unit is compatible with:
- Synology DS1815, DS1515, DS1511, DS1517, DX513
- QNAP 531 dedicated 1U power supply
- 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 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 where each connector goes (24-pin, 12-pin, 8-pin).
- Take a photo of the connector layout before disconnecting – this is critical due to the proprietary 12-pin 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?
Compatible with Synology DS1815, DS1515, DS1511, DS1517, and DX513 expansion unit.
Q2: Is this compatible with QNAP NAS?
Yes, it is compatible with QNAP 531 dedicated 1U power supply models.
Q3: What connectors does this power supply have?
It includes: 1x 24-pin, 1x 12-pin (proprietary), and 1x 8-pin connectors.
Q4: Why does it have a 12-pin connector?
The 12-pin connector is a proprietary interface specifically designed for Synology and QNAP NAS motherboards. It is not a standard computer connector.
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 regular computers.
Q6: What are the physical dimensions?
150mm × 80mm × 40mm (1U Flex form factor).
Q7: Is this a genuine Synology/QNAP power supply?
This is a high-quality compatible replacement that meets or exceeds OEM specifications. It is specifically designed for NAS and 1U server applications.
Q8: Does this work with Synology DS1817+?
Please check your original power supply model number. This unit is specifically designed for DS1815 series. For DS1817+, please verify compatibility with your original PSU label.
Q9: What is the warranty period?
Nadalan offers a 1-year warranty on this power supply.
Q10: How long does shipping take?
Approximately 10 days by air freight. Tax and duty included for most countries.
Q11: What input voltage does this support?
110V-220V universal input – works worldwide with the appropriate power cord.
Q12: Do you offer wholesale pricing for server/NAS power supplies?
Yes. Nadalan welcomes bulk orders for server and NAS power supplies. 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, efficient power.