Solar-Powered 4G CCTV for Construction Sites: Security Without Mains Power

Construction sites have a security paradox: the periods when they are most vulnerable — before the temporary electrical supply is energised, and after the cabins and generators leave — are precisely the periods when there is no power for security equipment. Thieves know the rhythm of a build as well as any site manager, and the groundworks phase, with plant parked on an open field and no fencing worth the name, is when kit disappears. Solar-powered 4G CCTV exists for exactly this gap: cameras that bring their own power and their own connectivity, live on site within an hour of arriving, and needing neither a mains hook-up nor a broadband line. Here is how to specify them for a UK construction site. Last updated: July 2026. Why construction sites lose kit The pattern in UK site theft statistics is consistent: plant, fuel and power tools taken at night and at weekends, overwhelmingly from sites with no monitored surveillance, and mostly during phases when the site was effectively dark — no power, no cameras, no deterrent. Insurers have noticed too: excesses on plant theft are climbing, and a growing number of policies now ask what surveillance was in place at the time of loss. The economics are lopsided. A stolen excavator is a five-figure loss plus programme delay; the solar camera that would have deterred the visit or captured the plates costs less than the excess on the claim. Solar and battery sizing: spec for December, not July The single most common failure in solar CCTV is optimistic sizing. A panel that keeps a camera alive through a bright June will go flat in the second week of a grey January. The rules we apply, explained fully in our solar-powered CCTV guide: 100 W of panel and 40 Ah+ of battery per camera is the practical minimum for year-round UK operation. Anything smaller is a summer-only product. Five days of battery autonomy covers the sunless stretches that UK winters reliably produce. Unshaded, south-facing panel placement — and survey the shading for winter sun angles, not the July sun that is out when the camera is installed. Scaffolding that goes up after installation is a classic way to kill a panel's output. Motion-triggered recording, not continuous — event-based operation cuts power draw dramatically and is what makes battery autonomy achievable at all. 4G connectivity: the site's broadband will not save you Site broadband, where it exists, arrives with the cabins and leaves with them — and it is usually not worth trusting a security system to. 4G-connected cameras keep their own connection, which means footage and alerts leave the site in real time rather than sitting on a recorder waiting to be stolen along with everything else. Our 4G CCTV without broadband guide covers the connectivity side in depth; the short version is to test signal at the actual mounting position and use a multi-network SIM so the camera connects to whichever network is strongest on that corner of the site. Redeployable towers vs fixed solar cameras Construction sites change shape weekly, and the security layout needs to move with the hoarding line. The choice is between two form factors: Rapid-deployment CCTV towers — a mast, panel array, battery bank and multiple cameras on a ballasted or trailer base. Towers give height (better coverage and harder to attack), bigger solar and battery capacity, and an unmissable visual deterrent at the gate or compound. They move by telehandler or trailer in under an hour when the site layout changes. Fixed solar cameras — single-camera units on a pole, container or fence post. Far cheaper per viewpoint, quick to relocate, and the right answer for choke points, plant compounds, fuel bowsers and the far corner of the site the tower cannot see. Most sites end up with a hybrid: one tower watching the entrance and compound, plus two or three fixed solar units covering the perimeter and whatever the current phase has made valuable. Siting rules — height, choke points, light — are the same as any camera; our camera siting guide covers the mistakes to avoid. Hire or buy? Tower hire is the construction default, but the maths deserves a proper look — hire costs typically overtake purchase between four and nine months, and most builds run longer than that. Ownership also means the same tower simply moves to the next site when the job finishes, making the second deployment free. The full break-even working is in our hire vs buy guide; the honest summary is that hire suits short fixed phases and buying wins for main contractors and anyone running multiple sites. Getting it right first time Tell us the site location, the programme length and what the current phase looks like, and we will spec a solar CCTV layout against it — tower, fixed cameras or both, with 4G coverage checked before anything ships. Browse rapid-deployment towers and solar-powered cameras, or talk to our UK team.