A remote camera pole looks like a small load until you add up everything that has to stay alive through a long winter night: cameras, IR illumination, a PoE switch or injector, a radio or modem, and sometimes enclosure heating.
For a site that is difficult to reach, the useful design question is not “How many watts is a camera?” It is how many watt-hours the entire station uses on a difficult day, and how many poor-solar days you want it to ride through.
1. Start with the camera datasheet, then measure if you can
Modern camera datasheets often publish both a typical and a maximum power figure. The difference matters. Axis, for example, explains that its typical figure can represent normal operation with heaters and IR off, while the maximum figure covers a more demanding operating state.
A simple planning worksheet might look like this:
| Device | Day assumption | Night / worst-use assumption |
|---|---|---|
| Camera A | 5W | 10W with IR |
| Camera B | 5W | 10W with IR |
| PoE switch / injector | 6W | 6W |
| Radio or modem | Add from datasheet | Add from datasheet |
For 10 hours of the day case and 14 hours of the night case:
That gives 524Wh/day before the radio/modem and conversion losses. It is an example, not a camera-industry average.
For a real installation, use the selected camera’s typical/max figures and verify whether IR, heaters, PTZ motors, or local storage are included.
2. Choose the power architecture from the actual PoE standard
A battery-backed DC architecture can avoid running a large AC inverter just for networking equipment, but only when the voltage ranges and PoE method line up.
Do not treat standards-based IEEE PoE, 24V passive PoE, proprietary passive injectors, and direct DC inputs as interchangeable.
A “24V system” battery is not a regulated 24.0V source. Its voltage moves with state of charge and charging. A DC-input PoE switch, converter, or radio must accept the full battery operating range, and its output must match the powered device.
Likewise, an enclosure marked NEMA 4X describes enclosure protection. It does not automatically mean every switch, battery, connector, and camera inside is rated for the site’s minimum and maximum temperature.
3. Build the winter budget around autonomy, not optimism
Suppose the station above uses 524Wh/day before communications equipment. After adding the radio/modem and realistic conversion losses, imagine your measured planning budget comes to 650Wh/day.
If you want four days of usable autonomy:
That is only the usable-energy target. Converting it into a battery nameplate requires the battery’s permitted depth of discharge, temperature behavior, BMS limits, and aging margin.
For LiFePO4 in a freezing climate, confirm the manufacturer’s charge-temperature limits. Some batteries include controlled self-heating; others simply block charging below a threshold. Heater energy also belongs in the load budget.
4. What makes a remote station dependable
For an unattended site, reliability usually improves more from boring details than from adding another panel:
- keep connectors dry and strain-relieved,
- provide surge protection and grounding/bonding appropriate to the site,
- use equipment with documented temperature ratings,
- log battery voltage and power if remote monitoring is available,
- leave enough PV headroom to recover after several poor days,
- make the enclosure serviceable without disturbing live conductors.
A camera system that is important enough to run all winter is worth sizing from actual data rather than optimistic brochure numbers.
Size the final load and storage target with our Solar + Battery Sizing Calculator.
Explore this decision in an appliance-based plan
Use the Build My Off-Grid System calculator to adjust your own appliances and compare daily solar balance, battery reserve and optional reserve recovery. The preset values are illustrative, not tested equipment specifications or local weather data. The tool is a planning screen, not an electrical compliance check.