Photovoltaics in Security and Defence Systems: Reliable Power for Remote Monitoring

Can semiconductor layers only a few micrometres thick help protect people, buildings or critical infrastructure? Not directly, of course. However, they can do so in a highly effective and unconventional way.

Photovoltaics can deliver quiet, locally generated electricity in places where no grid connection is available, where cabling would be too expensive, or where a conventional power outage would create a serious security risk. In this environment, solar panels are not simply energy-generating equipment. They become part of a decentralised security infrastructure.

A solar PV system can power remote cameras, motion detectors, environmental monitoring stations, access-control equipment, smoke and heat sensors, communication devices, traffic-monitoring equipment and other low-consumption electronic systems. In larger installations, the solar panels, solar battery, energy storage system, charge controller and, where required, solar inverter operate as one integrated power solution.

These applications are becoming increasingly important on agricultural land, construction sites, roads, industrial facilities, airports, border areas, solar farms and temporary project locations.

Remote Monitoring Is Becoming a Standard Security Requirement

Modern digital monitoring systems go far beyond basic motion detection. A professional security network may combine several types of cameras, sensors and communication equipment.

A system may include:

• High-resolution IP cameras
• Passive infrared motion sensors
• Active infrared detection
• Thermal imaging cameras
• RADAR or LIDAR sensors
• Automatic number-plate recognition cameras
• Smoke, heat and flame detectors
• Carbon monoxide and other gas sensors
• Environmental and meteorological sensors
• 4G, 5G, radio or LoRaWAN communication units

Recorded data can be processed locally by an edge device or transmitted through an IP network to a remote server. Video-management platforms and AI-based analytics may identify people, vehicles, animals, smoke or unusual thermal patterns.

Where facial recognition, number-plate recognition or other identification technology is used, the processing of personal data must comply with applicable European data-protection, employment and industry-specific regulations. The technical capability to use a function does not automatically mean that it can be applied without restrictions in every environment.

Why Traditional Power Supply Can Be a Problem

In many remote monitoring projects, providing electricity may be more expensive and technically demanding than purchasing the camera or sensor itself.

Monitoring agricultural land, road construction, open-pit mining, solar farms, repeater stations or temporary event sites may require hundreds of metres or even several kilometres of cabling. The project may also require trenching, cable protection, transformers, distribution cabinets and regular maintenance.

A cable-based solution also creates a potential single point of failure. One damaged cable, construction accident, weather event or deliberate act of sabotage can disable several monitoring points at the same time.

A photovoltaic system generates power locally. Each monitoring location can have its own solar panel, charge controller and battery, reducing dependence on a central energy source.

This does not mean that solar is automatically the best solution in every case. Its advantages only become meaningful when the load profile, winter generation, battery capacity and site conditions have been calculated correctly.

How Does a Solar-Powered Security System Work?

A professional solar-powered monitoring system consists of several compatible components. A solar panel alone cannot provide uninterrupted day-and-night operation.

Solar Panel or Photovoltaic Module

The solar panels generate electricity during daylight hours, power the connected equipment and recharge the energy storage system.

A small camera system may require only a module rated at several dozen watts. Systems using continuous video transmission, high-power communications, enclosure heating, infrared illumination or several cameras may need several hundred watts of installed PV capacity.

The installer should not select the module based only on nominal power. The following factors should also be considered:

• Available installation area
• Orientation and tilt angle
• Partial shading
• Expected winter solar irradiation
• Wind and snow loads
• Mechanical strength of the frame and mounting system
• Outdoor suitability of cables and connectors
• Risk of theft or vandalism

For temporary installations, portability and rapid assembly are usually the priority. For permanent installations, durability, weather resistance and long-term product availability are more important.

MPPT Charge Controller

Most small security systems use low-voltage DC equipment. For this reason, a traditional solar inverter may not be required.

The PV module can charge a 12 V, 24 V or 48 V battery through an MPPT charge controller. Cameras, modems and sensors can be powered directly from the battery through regulated outputs or DC-to-DC converters.

This approach can reduce conversion losses, standby consumption and the number of components used in the system.

A solar inverter may still be required where the installation includes 230 V AC equipment, local servers, lighting, heating or other high-consumption devices. In that case, an off-grid or hybrid inverter with low self-consumption and sufficient surge power should be selected.

Solar Battery and Energy Storage

The energy storage system supplies electricity during the night and maintains operation during cloudy weather or periods of low solar generation.

Modern lithium-ion and LiFePO4 batteries can provide higher cycle life, improved energy efficiency and greater usable capacity than conventional lead-acid batteries in suitable applications. Nevertheless, long-term reliability still depends on correct system design, monitoring and maintenance.

When selecting a solar battery, the installer should verify:

• Nominal and usable capacity
• Maximum charge and discharge current
• Operating temperature range
• Permitted charging temperature
• Battery-management-system functions
• Communication compatibility
• Expected cycle life
• Outdoor or cabinet installation requirements
• Manufacturer warranty and documentation

In colder climates, it is especially important that the battery-management system prevents charging at temperatures below the permitted limit. A heated enclosure or self-heating battery may be required in some installations.

Communication and Remote System Monitoring

Power supply is only one part of a functioning security system. The communication connection must also remain reliable.

Wi-Fi may be suitable where the monitoring point is located within an existing network. Remote sites usually require 4G, 5G, industrial radio or microwave links. LoRaWAN may be appropriate for low-data sensor applications.

The power consumption of the communication equipment should not be underestimated. A continuously active mobile router or high-bandwidth modem may consume as much energy as the camera itself.

A professional installation should monitor not only the camera feed but also, where possible:

• PV generation
• Battery state of charge
• Charging and discharging current
• Internal enclosure temperature
• Communication status
• Low-voltage alarms
• Door opening or enclosure tampering
• Equipment faults and restarts

System Sizing Does Not Start with the Solar Panel

One of the most common mistakes is selecting the solar panel and battery first, and only afterwards checking whether they are large enough.

Correct system design starts with the load.

Determine Daily Energy Consumption First

Assume that a remote monitoring point uses the following equipment:

• Camera: 8 W
• Mobile router: 5 W
• Sensors and control equipment: 3 W

The average continuous load is therefore 16 W.

Daily energy consumption:

16 W × 24 hours = 384 Wh per day

Losses from the charge controller, cabling, voltage conversion and battery must then be added. With a 20% design margin, the daily energy requirement may be approximately 460 Wh.

Calculate the Required PV Capacity

If the critical design period provides the equivalent of 1.5 full-sun hours per day, the theoretical minimum PV capacity is:

460 Wh ÷ 1.5 hours = approximately 307 W

Because of dirt, temperature, partial shading, charging losses and weather variation, a practical system may require approximately 400–500 W of PV capacity.

This is an illustrative calculation only. Final sizing must use location-specific irradiation data, orientation, tilt, cable losses and the real consumption profile of the selected equipment.

Size the Battery According to the Required Autonomy

For three days of independent operation:

460 Wh × 3 days = 1,380 Wh of usable energy

If the design allows 80% of the battery’s nominal capacity to be used:

1,380 Wh ÷ 0.8 = 1,725 Wh of nominal capacity

In this example, a solar battery with a nominal capacity of approximately 1.7–2 kWh may be required.

The final capacity may need to be increased to compensate for low winter temperatures, battery ageing, standby consumption, longer cloudy periods and additional infrared lighting at night.

Which Loads Create the Most Sizing Problems?

The nominal power shown on the camera datasheet is often not sufficient for accurate system design.

Infrared and White-Light Illumination

A camera may use relatively little power during the day, but infrared LEDs or integrated white-light spotlights can significantly increase consumption at night.

This is particularly important in winter because the operating time of the night-time illumination increases just as solar generation decreases.

PTZ Cameras

Pan-tilt-zoom cameras can create short power peaks when their motors move the camera or operate the zoom function.

The battery, wiring and DC-to-DC converter must be capable of handling these temporary loads.

Enclosure Heating and Dehumidification

Heating or dehumidification inside an outdoor cabinet may become a continuous winter load. Heating a poorly insulated enclosure can multiply the total daily energy consumption of the system.

Continuous Data Transmission

Streaming high-resolution video over a mobile network 24 hours a day requires more power and data than event-based recording.

A more energy-efficient solution may use local edge analysis and transmit large amounts of data only when motion, an alarm or another defined event is detected.

Where Can Solar-Powered Remote Monitoring Be Used?

Construction and Road-Building Sites

Monitoring locations on construction sites frequently change, while the permanent electrical infrastructure may not yet be available.

A mobile solar-powered camera tower can be relocated more easily than a fixed cable-based system. A complete solution may combine cameras, lighting, an audible alarm, a 4G router, batteries and solar panels.

Agricultural and Forestry Locations

A solar PV system can monitor machinery, fuel storage, livestock facilities, forest roads, remote gates and other isolated assets.

Heat, smoke and environmental sensors can also support the early detection of forest or grass fires. Large-area communication, low energy consumption and long system autonomy are particularly important in these projects.

Solar Farms and Energy Storage Facilities

At a utility-scale solar PV system or battery energy storage facility, independent backup power for the security infrastructure can be especially valuable.

An outage on the main AC network should not automatically disable perimeter protection, surveillance cameras, access control or alarm communication. The security equipment may therefore require a separate DC power system or dedicated battery backup.

Transport and Logistics

Traffic-counting devices, speed-monitoring systems, temporary road closures, parking areas, railway infrastructure and logistics gates can also be powered by photovoltaics.

In these applications, the installer must also consider vibration resistance, lightning and surge protection, communication latency and relevant transport-safety requirements.

Industrial and Critical Infrastructure

Remote water infrastructure, telecommunications stations, energy facilities, pipelines and other critical assets may benefit from decentralised monitoring power.

Locally generated electricity can improve the resilience of the security system and reduce dependence on a single grid connection.

Photovoltaics in Defence and Military Power Supply

Modern defence systems depend heavily on electricity. Communication devices, detection equipment, night-vision systems, portable computers, medical equipment, drones, control systems and temporary command posts may all require continuous power.

Traditional fuel generators can provide substantial power, but they require fuel transport, refuelling and regular maintenance. They also generate noise and considerable waste heat.

The most important advantage of photovoltaics in this environment is not limited to lower emissions. Solar energy may:

• Reduce fuel logistics
• Lower generator operating time
• Provide low-noise electricity
• Charge portable batteries on site
• Act as a decentralised backup power source
• Support hybrid microgrids

In mobile or temporary operations, the value of a solar PV system lies in its ability to reduce the need to transport fuel and maintain power generation equipment at every location.

Portable and Flexible Solar Panels

Traditional glass-glass and glass-backsheet solar panels are suitable for permanent installations, but their weight and rigidity may become disadvantages in portable applications.

Thin-film or lightweight composite modules may be:

• Rollable or foldable
• Used as portable battery chargers
• Attached to tents and temporary shelters
• Integrated into vehicles and mobile containers
• Used to provide a large active area at relatively low weight

For these systems, power density is only one of several important design considerations. Mechanical fatigue, water resistance, bending cycles, connector durability, partial shading, surface reflection and repairability are equally important.

The Potential of Sb2S3 Thin-Film Technology

Antimony sulphide, or Sb2S3, is a semiconductor material being investigated as a potential absorber for next-generation thin-film solar cells.

The Thin Film Energy Materials Laboratory at Tallinn University of Technology, TalTech, develops metal-oxide and metal-sulphide thin films for photovoltaics, sensors and electronics. The research includes deposition methods such as spray pyrolysis, chemical bath deposition and sol-gel processes.

Potential advantages of Sb2S3 include:

• Extremely thin active layers
• Strong light absorption
• Low material consumption
• Deposition on surfaces of different shapes
• Potential semi-transparent structures
• Possible operation under indoor or diffuse-light conditions

However, it is important to distinguish between theoretical potential and current commercial performance.

The theoretical efficiency potential of Sb2S3 solar cells is considerably higher than the efficiency demonstrated by current experimental devices. Interface defects, charge recombination and long-term material stability remain important technical challenges.

Sb2S3 should therefore not currently be considered a higher-efficiency replacement for commercial crystalline-silicon solar panels. Its value lies mainly in potential specialist applications, unusual shapes, thin-film integration and semi-transparent surfaces.

In the future, partially transparent photovoltaic layers may potentially be deposited on windows, sensor covers, optical equipment or other surfaces where traditional modules cannot be installed, provided that they do not interfere with the primary function of the equipment.

What Are the Main Limitations?

A solar-powered security system is not maintenance-free and does not provide unlimited energy.

Winter Energy Deficit

The lowest PV generation often occurs at the same time as the highest demand.

Winter nights are longer, infrared illumination operates for more hours, and cold-weather enclosure heating may be active while solar generation is reduced.

The system must therefore be sized for the critical winter period, not according to average annual production.

Shading and Contamination

On a small solar panel, bird droppings, leaves, snow or the shadow of a nearby pole can cause a substantial reduction in output.

The module should be installed where inspection and cleaning remain possible.

Battery Lifetime

An undersized battery may frequently reach a deep state of discharge, accelerating capacity loss. Excessive cabinet temperature can also shorten battery lifetime.

Mechanical and Environmental Protection

An IP rating alone does not guarantee the reliability of the complete installation.

The installer must also inspect cable entries, condensation risk, ventilation, UV resistance, corrosion, lightning protection and the mechanical stability of the mounting system.

Communication and Cybersecurity Risks

A camera without electricity is unusable, but the same applies when its communication connection fails.

The installation should include secure device access, user-permission management, encrypted data transmission, software updates and local backup recording. Critical systems may require redundant communication methods or local event storage.

Procurement Considerations for Installers, EPC Companies and Resellers

When purchasing components for a solar-powered security system, it is not enough to select the cheapest module, battery and charge controller separately. Compatibility must be evaluated across the complete system.

A professional request for quotation should include at least:

• Installation country and site type
• Continuous and peak power consumption
• Daily energy requirement
• Required autonomy in days
• Number of cameras and sensors
• System voltage
• Communication method
• Environmental temperature range
• Permanent or temporary installation
• Available solar-module area
• Required IP and mechanical protection
• Remote-monitoring requirements
• Expected warranty and technical documentation

Complete Kit or Custom-Designed System?

For smaller, standardised applications, a preconfigured complete kit or solarkit may provide a faster and more predictable solution.

A complete kit may include:

• PV module
• MPPT charge controller
• Solar battery
• Outdoor enclosure
• DC protection equipment
• Mounting structure
• Cables and connectors
• Preconfigured remote monitoring

For larger or critical projects, custom engineering is normally required. The cameras, communication equipment, heating, energy storage and solar inverter must be evaluated in one coordinated system design.

Why Documentation and Long-Term Availability Matter

When choosing a B2B solar webshop, European solar wholesaler or solar PV supplier, the unit price should not be the only consideration.

Important procurement criteria include:

• Verified manufacturer datasheets
• Compatibility documentation
• Required EU compliance documents
• Clear warranty terms
• Spare-parts availability
• Technical installer support
• Verified warehouse stock
• Predictable European delivery
• Future expandability within the same product range

A low-cost battery or charge controller without proper documentation may generate significant call-out and repair costs at a remote site. Total lifecycle cost is therefore often more important than the initial purchase price.

Relevant Product Categories for Solar Security Projects

A professional solar-powered remote monitoring project may involve the following product categories:

• Compact and standard solar panels
• Rigid, lightweight or flexible PV modules
• MPPT charge controllers
• LiFePO4 and other solar battery solutions
• Low-voltage energy storage systems
• Off-grid and hybrid solar inverters
• DC-to-DC converters
• DC isolators, fuses and surge-protection devices
• Outdoor electrical enclosures
• Solar cables and connectors
• PV mounting systems
• Remote monitoring and communication devices
• Preconfigured complete kits and solarkit solutions

For professional enquiries, Solar&Solar Wholesale can assess suitable product categories based on the load data, required autonomy and installation environment, while also considering current warehouse stock, component compatibility and European delivery options.

Frequently Asked Questions About Solar-Powered Security Systems

Can a security camera operate completely without grid electricity?

Yes. With a correctly sized solar panel, charge controller and battery, a camera and its communication equipment can operate entirely off-grid.

Is a solar inverter required for a solar-powered camera system?

Not always. If the camera, router and sensors operate on low-voltage DC, they can be powered directly from a DC battery system. A solar inverter is required when the installation includes AC equipment.

What size battery is needed for a remote camera?

This depends on the power consumption of the camera, night illumination, communication equipment and required autonomy. The calculation should be based on Wh per day, not only on the battery’s Ah rating.

Can the system operate during winter and cloudy weather?

Yes, provided that the solar panels and energy storage system are sized according to the critical winter irradiation level. A system selected using summer performance data may be insufficient in winter.

Can flexible solar panels be used for security or defence applications?

Yes, especially in mobile and temporary installations. However, the installer should verify mechanical durability, connector quality, water resistance, bending limitations and real-world power output.

Is a complete solarkit better than a custom-designed system?

A complete kit may be practical for small and standardised loads. For critical, high-consumption or complex installations, a custom-designed system will usually provide greater reliability.

Photovoltaics can play a much larger role in security technology than the familiar image of a small solar-powered camera suggests. With correct engineering, it can create an autonomous energy infrastructure capable of supporting monitoring and communication equipment at remote, temporary or vulnerable locations. Reliable operation depends not only on the solar panel, but also on accurate load calculations, suitable solar battery capacity, intelligent charge control, environmental protection and verified component compatibility.