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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsA UPS can keep a Windows PC and the network equipment it needs running through a short power cut, but only for as long as its battery lasts. To handle a longer outage safely, size the UPS for your actual load and desired runtime, configure its shutdown software, and test whether your PC starts again when power returns. A UPS alone cannot guarantee an uninterrupted stream or automatically relaunch OBS.
What a UPS can—and cannot—do for OBS
A UPS (uninterruptible power supply) switches its connected equipment to battery when mains power fails. That can bridge brief interruptions while your PC continues running OBS. The available time depends on the UPS, its battery condition and the connected load; a UPS is not an all-night power source unless it is part of a separately sized longer-duration system.
If an outage lasts longer than the UPS can support, the safer plan is an orderly Windows shutdown before the battery runs out. When utility power returns, the UPS may restore output, but the computer may remain off. Even if Windows starts, that does not establish that OBS or a YouTube live stream will relaunch. Treat recovery as a workflow to configure and test, not a guarantee of uninterrupted broadcasting.
Size the UPS for your equipment and outage
Measure the load you actually intend to back up
- List the equipment that must stay powered: the PC, any monitor needed to manage it, and the modem, router or other network equipment required for the stream.
- Measure or estimate each device’s running watt draw, then add the figures to find the total load. Use the equipment’s power information or a suitable power meter; do not choose a UPS rating based on the PC’s name or processor alone.
- Check the UPS’s maximum output in both watts and VA (volt-amperes). The attached load must stay within both limits.
- Decide how many minutes you need: enough to ride through brief cuts, or enough to keep working until a planned shutdown. Compare that target with the manufacturer’s runtime information at your calculated load.
APC by Schneider Electric recommends a UPS output watt capacity 20–25% higher than the connected equipment’s total draw. That is APC’s purchasing guidance, not a universal standard or a promise of a particular runtime. Its buying guide also explains that adding connected equipment reduces runtime: APC UPS buying guide.
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Connect only essential equipment to battery-backed outlets
Use battery-backed outlets for the devices the stream depends on. If the PC needs a router and modem to retain internet access, include them in the backup plan; a running PC without a working network link cannot keep an internet stream online. Avoid placing nonessential accessories on battery backup, since their draw reduces the time available to critical equipment.
For a laptop, its built-in battery may bridge a power interruption, but an external display and network equipment can still need backup. Runtime varies by device and workload; the sources cited here do not establish a laptop-specific duration.
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Set up graceful shutdown for a long outage
- Check UPS communication support. If the UPS supports USB monitoring, confirm that its management software supports your particular UPS family and software version.
- Install and configure the compatible shutdown software. Set it to shut Windows down gracefully during a prolonged disturbance, with enough battery reserve to complete the shutdown before power is exhausted. APC describes PowerChute as supporting unattended shutdown in prolonged disturbances; compatibility depends on the UPS family and software version. See APC’s PowerChute guide.
- Choose a shutdown threshold from your runtime needs. Use the UPS maker’s guidance and runtime information for your actual load. Do not assume a displayed runtime estimate guarantees that much time under a demanding OBS workload.
- Test the shutdown behavior safely. Follow the UPS maker’s instructions for testing. Confirm that monitoring software detects the event and that Windows closes cleanly. Do not wait for a real outage to discover that monitoring is not configured.
A graceful shutdown protects the PC from simply losing power when the battery is depleted. It does not keep OBS live for the full outage.
Configure the PC to start when utility power returns
- Check your motherboard or PC manual for a BIOS/UEFI option named something like Restore AC Power, AC Back or Power On After AC Loss. Names and availability vary by system.
- If available and appropriate for your setup, enable the option so the PC can start when AC power is restored after an outage.
- Configure Windows sign-in and OBS startup only if you want an unattended restart. Windows starting does not itself prove that OBS will open the right scene, find its devices or resume a stream.
- Perform a controlled end-to-end test: verify the UPS response, graceful shutdown if the interruption is prolonged, power restoration, PC boot, network access, OBS scene and audio devices, and stream status where applicable.
APC says a Back-UPS restarts when adequate utility power returns, but the attached computer may not; the computer’s BIOS must be configured to power on when power becomes available. That guidance is specific to the described APC behavior, and your UPS and PC may differ. See APC Canada’s power-restoration FAQ, modified March 20, 2025.
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Microsoft documents Windows automatic restart after a system error, but that is not evidence that Windows or OBS will start after mains power returns. See Microsoft Learn’s system failure and recovery guidance.
Check OBS performance before relying on it
OBS Project lists Windows 10 or Windows 11 and a DirectX 10.1-compatible GPU among its basic Windows requirements. Meeting those requirements does not guarantee that a particular PC can sustain the chosen stream workload: CPU demand varies with encoder, resolution, frame rate and scene complexity. Run OBS’s Auto-Configuration Wizard as a starting point, then validate your actual scenes and intended workload before leaving the PC unattended. See OBS Project’s system requirements (page dated August 25, 2021).
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Test again after material changes to Windows, OBS, drivers, UPS software or hardware. A setup that worked before an update may not behave identically afterward.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot common power-cut failures
| Symptom | Likely cause | What to check |
|---|---|---|
| The PC shuts off soon after a cut begins. | The connected load exceeds what the UPS can support, the battery is weak, or the PC is not connected to a battery-backed outlet. | Confirm the outlet, total load and UPS watt/VA limits. Check the runtime guidance for that load and inspect battery condition. |
| The UPS stays on, but the stream loses internet. | The modem, router or required network equipment is not backed up, or its power connection is interrupted. | Identify every network device the stream needs and include it in the battery-backed load calculation. |
| Windows is not shut down cleanly before the UPS battery runs out. | Monitoring software is absent, incompatible, not connected, or its shutdown behavior is not configured appropriately. | Check USB communication, UPS software compatibility and shutdown settings; run a controlled test. |
| Power returns, but the PC stays off. | The PC may not have a power-on-after-AC-loss option enabled or may not support it. | Check BIOS/UEFI settings and the system manual. Confirm whether the UPS has restored adequate output. |
| The PC boots, but OBS or the stream does not resume correctly. | Startup, sign-in, scene/device availability or stream recovery has not been verified. | Test the entire restart sequence on the actual setup and manually check the stream status. Do not assume a universal auto-relaunch or reconnect behavior. |
| Backup time has declined compared with earlier tests. | The battery may be incompletely charged or aging; runtime declines as a battery ages. | Check battery health and manufacturer troubleshooting guidance, and verify replacement compatibility for the exact UPS model. See APC battery troubleshooting guidance. |
Or let it run in the cloud
If the goal is to keep a prerecorded YouTube channel live rather than keep a local OBS PC running, StreamNeo is a cloud alternative: upload a recording or build a playlist, add your YouTube stream key, and go live. It loops uploaded videos from the cloud, so no computer or home internet connection has to stay on for the stream to keep running. It supports any uploaded quality up to 4K 60fps at one flat price per slot, can automatically recover if YouTube drops the stream, and the first day is free with no card. The monthly plan is $9.99 per month. StreamNeo streams to YouTube only and plays uploaded videos; it is not a camera-streaming service.
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