What Happens to Security Cameras When the Power Goes Out?

Last updated: October 20, 2026

The Four Links That Decide What Survives a Power Outage

Security-camera outages are easier to understand when you stop thinking about the camera as a single device and instead look at the complete path that footage has to travel.

There are four separate links:

1. Camera power: Can the camera itself stay on?
2. Recording: Is there still somewhere for the footage to be stored?
3. Local network: Can cameras still communicate with an NVR, hub, or other equipment inside the property?
4. Internet connection: Can footage, alerts, and live video still reach you when you are away from the property?

These links can fail independently. That is why a camera can appear to be working while your phone cannot connect to it, or why a recorder can remain powered while all of its PoE cameras have gone offline.

What Happens to Each Type of Security Camera When the Power Goes Out?

Power Outage vs. Internet Outage: They Are Not the Same Failure

This distinction matters more than whether a camera is advertised as “wired” or “wireless.”

An internet outage removes the connection between your property and the outside world. A power outage can shut down the equipment that creates both your local network and your recording system.

The practical takeaway is that local recording is much easier to preserve during a long outage than remote access. Keeping an NVR recording inside the house may require only tens of watts. Keeping cloud cameras accessible remotely requires the camera system plus the entire internet chain.

What Happens to Wi-Fi Security Cameras During a Power Outage?

The word “Wi-Fi” describes how the camera communicates. It does not tell you how the camera is powered.

A plug-in Wi-Fi camera still depends on a wall outlet. When that outlet dies, the camera dies unless the outlet or power adapter is backed up.

A battery-powered Wi-Fi camera is different. The camera may continue detecting motion and capturing footage during the outage because its own battery remains available. But its Wi-Fi connection may disappear as soon as the router loses power.

Whether footage is actually saved depends on where the camera stores it:

• A camera with a microSD card may continue recording locally.
• A camera that records to a powered local hub may continue if that hub also has backup power.
• A cloud-dependent camera may lose cloud recording when the internet connection disappears.
• Remote live view and phone alerts normally require a functioning internet path.

What Happens to PoE Cameras During a Power Outage?

Power over Ethernet can actually make backup planning simpler because power for several cameras is concentrated at one location.

A typical PoE camera receives both data and electricity through the same Ethernet cable. The electricity normally comes from one of three places:

• A PoE NVR
• A dedicated PoE network switch
• A PoE injector

If that central power source shuts down, every camera connected to it can shut down at once.

But the same architecture creates an advantage: instead of placing a battery at every camera, you can often protect the PoE switch or PoE NVR with one properly sized backup system.

A PoE system that should keep recording locally

A practical outage-resistant arrangement is:

Backup battery → PoE NVR or PoE switch → cameras

If a separate NVR is used:

Backup battery → PoE switch + NVR

If remote viewing is also required:

Backup battery → PoE switch + NVR + router + modem/ONT

Reolink, for example, states that its PoE cameras and NVRs can perform local functions without internet, although remote access and internet-dependent notifications are unavailable. See the Reolink PoE offline-operation documentation.

What Happens to Traditional Wired CCTV and DVR Systems?

Traditional analog CCTV usually separates the video cable from the power cable. A coaxial cable carries video to the DVR, while the camera may receive 12V DC from a central power supply.

That means two pieces must survive the outage:

1. The power supply feeding the cameras
2. The DVR storing the footage

If the DVR remains powered but the camera power supply shuts down, the DVR may stay on while recording blank or lost channels. If the cameras remain powered but the DVR shuts down, there is no recorder available to save the footage.

The router is not normally required for basic local DVR recording. It is required if you want remote viewing, remote alerts, or cloud-related features.

What Happens to Battery and Solar Security Cameras?

Battery-powered cameras have an obvious advantage during a grid outage: the loss of household electricity does not immediately shut down the camera.

However, battery cameras often work differently from continuously recording wired cameras. Many conserve energy by remaining in a low-power state until motion is detected, then recording an event clip.

Solar cameras usually combine a rechargeable battery with a panel that replenishes the battery during daylight. A utility outage does not directly affect that energy source, but extended clouds, snow, shade, cold conditions, heavy activity, or poor solar orientation can still drain the battery faster than it recharges.

For an isolated property, the most resilient architecture is often:

• Battery or solar power at the camera
• Local microSD or hub storage
• Optional cellular connectivity for remote access

That removes several dependencies on the building's electrical and broadband systems.

What Happens to Ring, Arlo, and Reolink Cameras During an Outage?

Brand behavior depends on the exact model and storage configuration, so the model manual should always take priority. These are the important architectural differences documented by the manufacturers.

Ring has an important power-outage distinction

Ring Alarm Pro includes an internal backup battery, but Ring explains that the system enters a reduced-power state when relying on that internal battery. Full Wi-Fi functionality during an outage requires the appropriate external backup arrangement. Ring also offers backup internet capabilities on supported subscriptions and configurations.

That distinction matters because keeping an alarm base station alive is not necessarily the same as keeping the entire Wi-Fi camera network operating normally.

Arlo users should protect the SmartHub or Base Station

A battery-powered Arlo camera can have plenty of battery remaining while its local storage path disappears because the indoor hub lost power.

If local recording during an outage matters, include the SmartHub or Base Station in the backup-power plan.

Reolink makes the local-vs-network distinction especially clear

Reolink's support documentation distinguishes between camera operation, local microSD or NVR recording, and network-based features. That is the right way to think about any security-camera system regardless of brand.

Will Security Cameras Keep Recording If the Internet Goes Down?

Many will, provided recording is local and every device involved in that local recording path still has power.

This is why a locally recording camera system can be surprisingly resilient. You may lose the ability to watch the driveway from your phone while away from home, but the NVR can continue building a complete local video record for later review.

Do Your Router, Modem, and Fiber ONT Need Backup Power?

If you want remote viewing or cloud recording during an outage, the answer is usually yes.

Backing up only your router can still leave you offline because the router is only one part of the internet path.

Depending on your service, the chain may look like:

Cable internet: ISP network → modem/gateway → router → camera

Fiber internet: ISP fiber → ONT → router → camera

DSL: telephone network → modem/router → camera

The ONT is especially easy to overlook. Verizon, for example, states that its Fios ONT requires electrical power, and some Verizon battery-backup products are designed to preserve basic voice service rather than internet service. See Verizon's ONT documentation and battery-backup information.

Exactly What Should You Put on Backup Power?

Do not start by counting cameras. Start by tracing the power path.

For one plug-in Wi-Fi camera

• Camera power adapter
• Wi-Fi router
• Modem or ONT if remote access is important
• Local hub if footage is stored there

For a 4-camera PoE system

• PoE NVR or PoE switch
• NVR if separate
• Router if remote access is required
• Modem or ONT if internet access is required

For an analog CCTV system

• Central 12V camera power supply
• DVR
• Router and modem/ONT only if remote access is required

What usually does not need to stay on

A monitor is often the easiest load to remove. The recorder can continue operating without continuously powering a display.

A monitor consuming 25W for 24 hours uses 600Wh by itself. During a long blackout, turning it off can preserve hours of additional camera runtime.

UPS vs. Portable Power Station for Security Cameras

A traditional UPS and a portable power station solve related but slightly different problems.

The simplest configuration

If your portable power station has a suitable UPS mode, connect the critical camera system to the station and leave the station connected to utility power according to its manual.

When utility power disappears, the station switches to battery operation.

When a separate UPS can still make sense

An NVR, server, or sensitive network device may benefit from a dedicated UPS even when a larger battery station is available.

A layered configuration can be:

Wall outlet → portable power station → dedicated UPS → sensitive NVR/network equipment

The small UPS deals with very short interruptions while the larger portable power station supplies energy during the longer outage.

This arrangement introduces additional conversion losses, so it is not always necessary. Test the exact UPS, power station, recorder, and network equipment together before depending on it.

How Much Battery Do You Need for 8, 24, 48, or 72 Hours of Security Camera Backup?

The correct battery size depends on the complete system load, not the number of cameras.

For UDPOWER planning examples, a practical estimate uses 90% usable conversion efficiency:

For example, a security system averaging 50W for 24 hours requires approximately:

50 × 24 ÷ 0.90 = 1,333Wh

That is the theoretical planning requirement. Actual runtime can vary because of inverter standby consumption, temperature, battery state of charge, camera night-vision load, PoE conversion loss, recorder activity, and other connected equipment.

Why 72-hour planning changes the system design

An 8-hour backup can often be solved with stored battery capacity alone. A 72-hour outage is different.

At 65W, three days of continuous operation represents more than 4.6kWh of actual load energy. After conversion allowance, the nominal battery requirement is roughly 5.2kWh.

At that point you should normally combine several strategies:

• Turn off nonessential monitors and accessories.
• Separate security equipment from high-power household appliances.
• Use local recording so internet equipment does not have to stay powered if remote access is not essential.
• Recharge from solar or another approved source when possible.
• Prioritize critical entrances or perimeter cameras if the system allows selective shutdown.

How Long Can UDPOWER Run a Security Camera System?

The following estimates use the current official capacities of the UDPOWER S1200 and UDPOWER S2400 together with the same 90% planning efficiency used throughout UDPOWER runtime calculations.

These are planning estimates rather than guaranteed runtimes. Measure the actual system at the wall whenever possible, especially after dark when infrared LEDs, spotlights, heaters, and other camera functions may increase consumption.

For detailed camera wattage ranges, PoE budgets, and NVR power examples, see UDPOWER's How Many Watts Does a CCTV Camera Use? guide.

Recommended UDPOWER Backup Power for Security Cameras

Security-camera systems rarely need enormous AC output. For this use case, battery capacity, continuous operation, output stability, and outage transfer behavior matter more than headline wattage.

UDPOWER S1200: Best All-Around Choice for a Home Security System

The S1200 is the more practical fit when your priority is a focused backup load such as cameras, a PoE switch, an NVR, Wi-Fi equipment, and other low-power electronics.

• Battery capacity: 1,191Wh
• Rated AC output: 1,200W pure sine wave
• UPS Prime response: ≤10ms
• Maximum solar input: 400W
• Weight: approximately 26 lb

For a 50W security load, the planning estimate is approximately 21.4 hours. For a 20W camera-and-network setup, it is approximately 53.6 hours.

The S1200 is therefore a strong match for a small home NVR system, router backup, a few PoE cameras, or a security setup that mainly needs to survive an overnight outage.

Its published UPS response time is useful for equipment that should not reboot when grid power disappears, but the exact NVR, router, switch, and camera system should still be tested before relying on automatic transfer.

View UDPOWER S1200

UDPOWER S2400: Better for Longer Outages and Larger Camera Systems

The S2400 is the better fit when the security system includes more cameras, a larger recorder, multiple network devices, or when you want a longer outage window without immediately recharging.

• Battery capacity: 2,083Wh
• Rated AC output: 2,400W pure sine wave
• UPS Prime response: ≤10ms
• Recommended maximum solar input: up to 420W
• Weight: approximately 40.8 lb

At a 50W average load, the planning estimate is approximately 37.5 hours. At 65W, it is approximately 28.8 hours. At 100W, it is approximately 18.7 hours.

That makes the S2400 a better fit for a full 4-camera PoE system that needs to stay recording for a day, an 8-camera system that needs overnight backup, or a remote-property setup where longer reserve capacity matters.

View UDPOWER S2400

Which one should you choose for security-camera backup?

See all current models on the UDPOWER Portable Power Stations page or browse the Home Backup Power Station collection.

Three Practical Outage Setups

Setup 1: One porch camera that you still want to view remotely

Back up:

• Camera
• Router
• Modem or ONT

If the combined system averages approximately 20W, the S1200 planning estimate is about 53.6 hours and the S2400 estimate is about 93.7 hours.

However, remote access still depends on your ISP's infrastructure remaining operational.

Setup 2: Four PoE cameras with an NVR

Back up:

• PoE switch or PoE NVR
• NVR if separate
• Router only if remote access is required
• Modem/ONT only if remote access is required

A complete setup often lands around 45–70W, although the exact total should be measured.

If the goal is evidence preservation rather than remote access, keeping the local PoE and NVR chain alive while leaving the modem/router off can significantly extend battery runtime.

Setup 3: Eight cameras, NVR, router, and remote monitoring

A system in this category may average around 80–130W depending on the cameras, recorder, hard drives, PoE equipment, and nighttime load.

At a 100W planning load, an S2400 provides approximately 18.7 hours under the stated assumptions. A true 24-hour target at 100W requires about 2,667Wh of nominal battery capacity at 90% conversion efficiency, so recharging or further load reduction becomes important.

How to Test Your Security Cameras Before a Real Power Outage

The best outage plan is one you have already tested.

Do this while everyone is home and there is no severe weather:

1. Confirm that all cameras are online and recording normally.
2. Check that the NVR, DVR, microSD card, or hub is actually storing footage.
3. Note the power station's battery level and the total wattage shown while the security system is operating.
4. Wait until nighttime if you use IR night vision or spotlights so you can observe the higher load.
5. Disconnect utility input from the backup system rather than turning the cameras off manually.
6. Confirm that the NVR or DVR does not reboot unexpectedly.
7. Confirm that every camera remains visible on the recorder.
8. Check local recording after 10–15 minutes.
9. Use cellular data on your phone to test remote access from outside the home Wi-Fi network.
10. Leave the system operating long enough to confirm that low-load shutdown or ECO behavior does not unexpectedly turn an output off.

Common Mistakes That Cause Security Cameras to Fail During an Outage

1. Backing up the camera but not the recorder

A powered camera is not useful if the NVR, DVR, or hub that stores its footage has shut down.

2. Backing up the NVR but not the PoE switch

The recorder may remain perfectly healthy while every camera connected through an unpowered PoE switch disappears.

3. Assuming a battery camera guarantees cloud recording

The camera may stay powered while the router and internet connection are offline.

4. Powering the router but forgetting the modem or ONT

A router can continue broadcasting Wi-Fi while having no actual internet connection.

5. Leaving a monitor on for the entire blackout

A screen can consume energy that would otherwise keep cameras recording for several additional hours.

6. Sizing from daytime camera wattage

Night vision and illumination can increase consumption after sunset.

7. Using the power adapter's maximum rating as actual consumption

A 12V 2A adapter can supply up to 24W, but the connected device may normally use much less. A plug-in watt meter gives a much more useful whole-system number.

8. Ignoring very low power draw

Some battery systems can automatically shut off an output when the connected load is extremely small. For continuous cameras, sensors, routers, or network equipment, perform a long-duration test and use the operating mode recommended for continuous low-power devices.

9. Assuming solar makes runtime unlimited

Solar output changes with season, weather, panel temperature, shade, sun angle, and daylight hours. Size the battery so the system can survive periods when solar production is poor.

10. Never checking what happens after power returns

After an outage, verify that all cameras reconnect, recording resumes, the NVR sees every channel, system time is correct, and remote access returns.

What Is the Most Resilient Security Camera Setup for a Power Outage?

If continuous evidence recording is your highest priority, a strong home or small-business design is usually:

1. PoE cameras powered from a centralized PoE switch or NVR
2. Local NVR storage
3. Backup power for the PoE source and NVR
4. Backup power for router and modem/ONT when remote access matters
5. Local storage that keeps recording even if the ISP goes down
6. Enough battery capacity for the expected outage window
7. Optional cellular failover when remote access is critical

For a simpler consumer system, a battery or solar camera with onboard microSD storage reduces the number of devices that have to survive the outage.

There is no single architecture that is best for everyone. The right design depends on which failure matters most to you: losing recording, losing live remote access, losing alerts, or losing all three.

Frequently Asked Questions

Sources and Further Reading