How to Connect and Configure a UPS on UGREEN NAS
A UPS does more than keep your NAS powered for a short time during an outage. With a supported communication cable, it can also report its power and battery status to UGOS Pro, allowing the NAS to enter Standby Mode or shut down automatically according to the protection settings you choose.
This guide uses the UGREEN US3000 as the connection example and explains how to connect a compatible UPS, confirm that UGOS Pro recognises it and configure what the NAS should do when mains power is lost.
If a power cut has already happened, see our guide to what to do after a NAS power outage.
Quick Guide: Connect and Configure a UPS on UGREEN NAS
| Check | What You Need to Do |
|---|---|
| Compatibility | Confirm that the UPS is compatible with your UGREEN NAS model. Do not assume that every UGREEN UPS supports every UGREEN NAS. Check the latest UGREEN NAS Products Compatibility List before setup. |
| Physical connection | Connect the NAS, UPS and USB communication cable according to the UPS instructions. |
| UGOS Pro | Open Control Panel > Hardware & Power > UPS and connect the detected UPS. |
| Protection mode | Choose Standby Mode or Auto Shutdown. |
| Trigger | Choose battery below 15%, a custom time or immediate execution. |
| Save and test | Click Apply, then perform a controlled power-loss test after setup. |
How UPS Protection Works on a UGREEN NAS
A UPS, or Uninterruptible Power Supply, provides temporary backup power when mains electricity is interrupted.
For a NAS, however, backup power is only part of the protection process. The NAS also needs to know that the UPS has switched to battery power so that it can carry out the protection behaviour configured in UGOS Pro.
With the UGREEN US3000 example in this guide:
- The power connection keeps the NAS running when mains power is interrupted;
- The USB data connection allows the NAS and UPS to exchange status information;
- UGOS Pro monitors that UPS status and activates the configured protection mode when the selected trigger is met.
How to Connect a UPS to UGREEN NAS
The following physical connection steps use the UGREEN US3000 as the example. Connection methods can differ between UPS models, so follow the manufacturer's instructions if you are using another device.
1. Check UPS Compatibility
Before connecting the UPS, confirm that it is compatible with your specific NAS model. Check the latest UGREEN NAS Products Compatibility List before setup.
2. Shut Down the NAS
Stop active data transfers and shut down the NAS properly.
Once the NAS has completely shut down, disconnect its power adapter from the NAS.
3. Connect the NAS Power Adapter to the UPS
Plug the original UGREEN NAS power adapter into the wall outlet, then connect its DC output to the DC IN port on the US3000.
4. Connect the USB Data Cable
Connect the UPS USB port to the USB port on the back of the NAS using the USB data cable.
This connection is used for communication between the UPS and the NAS, allowing UGOS Pro to receive UPS status information.
5. Connect the UPS to the NAS Power Input
Connect the UPS DC OUT cable to the NAS power input.
6. Check the Connection
Once the connection is established, the US3000 LED indicator should flash white. Power on the NAS and log in to UGOS Pro. You will confirm the UPS connection and status in the next section.
How to Configure the UPS in UGOS Pro
Once the UPS is physically connected, configure how the NAS should respond when mains power is interrupted.
1. Open the UPS Settings
Log in to UGOS Pro and go to:
Control Panel > Hardware & Power > UPS
UGOS Pro should automatically detect the connected UPS.
2. Connect the UPS in UGOS Pro
Click Connect.
Once connected, the UPS page will display information such as the device vendor and model.
3. Confirm the UPS Status
After the connection is established, check that UGOS Pro displays the UPS battery capacity and estimated remaining runtime.
If this information appears correctly, the NAS is receiving UPS status information.
Configure UPS Protection in UGOS Pro
UPS configuration in UGOS Pro involves two separate decisions:
- What should the NAS do? Choose a protection mode.
- When should it do it? Choose the trigger or waiting time.
1. Choose What the NAS Should Do During a Power Outage
Protection Modes
| Protection Mode | What Happens |
|---|---|
| Standby Mode | When Standby Mode is triggered, the NAS will stop all services to prevent data loss and shut down once the UPS battery is depleted. If Auto Power-on When Power is Supplied is enabled, it will restart automatically when mains power returns. |
| Auto Shutdown | The NAS will initiate a normal shutdown. If Auto Power-on When Power is Supplied is enabled, it will automatically restart when mains power is restored. |
2. Choose When UPS Protection Should Start
After selecting the protection mode, choose when UGOS Pro should activate it.
UPS Battery Below 15%
Select this option if you want the NAS to enter the chosen protection mode when the UPS battery level falls below 15%.
This lets the NAS continue operating on UPS power until the battery reaches the specified threshold.
Custom Time
Choose a custom time if you want the NAS to enter Standby Mode or Auto Shutdown after the UPS has been supplying backup power for a specified period.
For example, you can set the NAS to enter the selected protection mode after a specific period of UPS battery operation rather than waiting for the battery level to fall below 15%.
Execute Now
Choose Execute now if you want the selected protection mode to take effect immediately after the power-loss condition is detected.
Note: Regardless of the protection mode you select, the UGREEN NAS will shut down when the UPS battery is fully depleted.
Save the UPS Configuration
Once the protection mode and trigger have been configured, click Apply to save the settings.
The UPS connection is now configured in UGOS Pro.
Test the UPS After Setup
After installing and configuring the UPS, perform a controlled power-loss test before relying on the setup during a real outage.
Make sure important data transfers or other critical operations are not running, then disconnect the mains input to the UPS and observe how the system responds.
Check that:
- The UPS switches to battery power
- UGOS Pro reports the expected UPS status
- The NAS enters the configured protection mode at the expected trigger
- The NAS shuts down safely when required
Restore mains power after the test and confirm that the system returns to normal operation.
Frequently Asked Questions
Does the UPS still power the NAS if the USB data cable is not connected?
Yes. The UPS power connection and USB communication connection have different roles. The UPS can supply backup power to the NAS, while the USB connection allows UGOS Pro to receive UPS status information and use the configured protection features.
If you want the NAS to respond automatically to a power outage, make sure the supported UPS communication connection is configured correctly.
Can I use any UPS for a UGREEN NAS?
No. UPS support varies by NAS and UPS model. Check the latest UGREEN compatibility information before purchasing or configuring a UPS, and follow the manufacturer's connection instructions for third-party models.
Can one UPS protect more than one UGREEN NAS?
Yes, supported multi-NAS setups can use the NUT Server and Network UPS Slave features in UGOS Pro. One NAS communicates directly with the UPS and shares UPS status with other NAS devices over the local network.
The client devices can then apply their own power-protection settings without each requiring a separate direct USB communication connection to the UPS. If you want to learn how this setup works in practice, see our guide on setting up a NUT Server on UGREEN NAS.
Conclusion
The aim of a NAS UPS setup is not necessarily to keep the NAS running until every last bit of battery capacity is used. More importantly, it gives the system enough controlled time to react to a power interruption before backup power disappears.
Once you understand the difference between UPS power delivery, UPS status communication and the protection rules configured in UGOS Pro, it becomes much easier to choose a shutdown strategy that fits your NAS workload.