Security cameras are powered in four main ways: a standard AC outlet with a power adapter, a single Ethernet cable using Power over Ethernet (PoE), rechargeable batteries, or solar panels. The method depends on where the camera is installed, how much power it needs, and whether running cables is practical. Most wired cameras draw between 2 and 30 watts, depending on their features.
Plug-In Power Adapters
The most common setup for both indoor and outdoor cameras is a 12V DC power adapter that plugs into a standard wall outlet. The adapter converts your home’s AC power to the low-voltage DC current the camera needs. Most basic cameras require between 0.5 and 1 amp, so the adapter is small and similar to a phone charger.
The key detail to get right is matching the adapter’s output to the camera’s requirements. If a camera needs 1A of current, the adapter must supply at least 1A. Using an underpowered adapter causes problems like flickering video or the camera randomly shutting off. Some commercial-grade cameras use 24V AC instead of 12V DC, so always check the label on your specific model before buying a replacement adapter.
The downside of plug-in cameras is that you need an outlet near each camera location, or you’re running extension cords. For outdoor cameras mounted under eaves or along a roofline, that often means hiring an electrician to add a weatherproof outlet.
Power over Ethernet (PoE)
PoE cameras receive both power and data through a single Ethernet cable, which simplifies installation considerably. Instead of running a power cable and a network cable separately, one cable handles everything. This is the go-to method for professional and multi-camera setups.
Three PoE standards exist, each delivering different amounts of power:
- PoE (802.3af): Up to 15.4 watts per port. Enough for fixed indoor cameras and basic outdoor models.
- PoE+ (802.3at): Up to 30 watts per port. Needed for pan-tilt-zoom (PTZ) cameras, heated housings, or cameras with powerful infrared LEDs.
- PoE++ (802.3bt): Up to 60 or 90 watts per port. Used for high-performance equipment like video conferencing systems, though some advanced security cameras with built-in heaters and multiple sensors benefit from this standard.
PoE Switches vs. PoE Injectors
To send power over Ethernet, you need either a PoE switch or a PoE injector. A PoE switch has power delivery built into every port, so it can power multiple cameras from one centralized device. This is the better choice if you’re running four or more cameras. A PoE injector is a small, single-port device that adds power to a regular Ethernet connection. It sits between your existing non-PoE switch and the camera. Injectors are cheaper for one or two cameras, and they let you upgrade without replacing your current network equipment.
Cable Distance Limits
The official maximum distance for PoE is 100 meters (328 feet) over standard Ethernet cable. In practice, voltage drops can shorten that range. On Cat5e cables carrying the full 15.4 watts, the usable distance may shrink to 50 or 60 meters. Cat6 cables, which use slightly thicker conductors (23 AWG vs. Cat5e’s 24 AWG), handle longer runs more reliably because they lose less power along the way. For PoE++ at 60 watts, real-world usable distance can drop to just 15 to 25 meters, so plan cable runs carefully for high-power cameras.
Battery Power
Battery-powered cameras are the easiest to install because they need no wiring at all. You charge the battery, mount the camera, and connect it to your Wi-Fi network. Most battery cameras use lithium-ion cells with capacities between 5,000 and 12,000 mAh.
Runtime varies widely based on how much activity the camera records. A camera in a low-traffic area, where motion detection triggers only a few times a day, can last 3 to 6 months on a charge. In standby-heavy mode with minimal recordings, some models stretch to 12 months. Place that same camera facing a busy sidewalk, and you might be recharging every few weeks.
Cold weather is a serious factor for battery cameras. Lithium-ion batteries lose 20 to 50 percent of their capacity below freezing. A camera rated for 319 days at 68°F may last only 87 days at -22°F. That’s a 73 percent drop in runtime. Even more important: charging a lithium battery below 32°F (0°C) deposits metallic lithium on the internal components, causing permanent damage. If you live in a cold climate, bring the battery indoors to charge it, or choose a camera with a built-in heating system that warms the battery before charging begins.
Solar Power
Solar panels pair with battery cameras to reduce or eliminate the need for manual recharging. A small panel mounted near the camera trickle-charges the battery throughout the day. Most solar security camera panels are rated between 5 and 10 watts for basic models, though keeping a continuously recording camera powered in all conditions requires a much larger panel.
Sizing a solar panel depends on your location’s peak sun hours and the camera’s daily energy use. For a camera consuming about 288 watt-hours per day in an area averaging 5 peak sun hours, you’d need roughly a 75-watt panel after accounting for a 30 percent efficiency margin. That’s far larger than the compact panels bundled with most consumer cameras, which is why solar-equipped cameras almost always rely on motion-activated recording rather than continuous footage. In overcast climates or during winter months with fewer daylight hours, even a well-sized panel may not fully keep up, so the battery serves as a buffer.
USB Power for Indoor Cameras
Many small indoor cameras, like pet monitors and baby cameras, run on 5V USB power. You plug them into any USB wall adapter or even a powered USB port on a computer. Standard USB provides 5 volts, which is plenty for a compact camera drawing 2 to 5 watts. Some cameras use USB-C connectors, which can carry more power if needed, but most indoor cameras don’t require anything beyond a basic 5V/1A adapter. The convenience here is obvious: USB outlets are everywhere, and you likely already have spare adapters in a drawer.
What Affects Power Consumption
Not all cameras draw the same amount of power, even within the same product line. The features running at any given moment determine how many watts the camera pulls.
A basic wired indoor camera with a fixed lens uses 2 to 5 watts. Add infrared LEDs for night vision, and consumption jumps to 5 to 8 watts, because those LEDs are essentially tiny floodlights that illuminate the scene in invisible light. PTZ cameras with motorized lenses draw 15 to 30 watts or more, since they’re constantly running small motors to pan, tilt, and zoom. Outdoor cameras in cold climates sometimes include built-in heaters or blowers to prevent frost on the lens, which can push consumption even higher.
Resolution matters too. A 4K camera processes four times as many pixels as a 1080p model, which means more work for the onboard processor and more data to transmit. Higher resolution generally means higher power draw, though the difference is smaller than the gap between a fixed camera and a PTZ model. If you’re running multiple cameras on a single PoE switch, add up the total wattage of all connected cameras to make sure the switch’s power budget can handle the load.