Solar Airfield Ground Lighting (SAGL)
A practical engineering guide to solar-powered runway, taxiway and airport visual lighting systems. SAGL is an airfield visual-lighting arrangement in which photovoltaic energy is converted into electrical energy, stored in batteries where required, and used to operate aviation lighting equipment. Unlike conventional centralized AGL — which commonly depends on an electrical distribution network, CCRs, series circuits and isolation transformers — solar AGL can distribute the energy source directly at or close to individual lighting units, making it especially useful for remote, small, off-grid, temporary or infrastructure-constrained applications.
What Is Solar Airfield Ground Lighting?
A solar light is an integrated chain, not just a lamp: panel, controller, battery, driver, light and optics.
AGL Visual Encyclopedia: Renewable energy integration Energy-efficient AGL Portable PAPI
Solar AGL is an airfield-lighting system powered partly or entirely by photovoltaic energy. A typical unit integrates a solar panel, charge controller, rechargeable battery, LED driver, aviation light source and optical system — with additional components such as a radio receiver, remote controller, control/monitoring electronics, GPS or timing system, communication antenna, mounting structure and mechanical anchoring system.
The FAA is currently evaluating decentralized solar lighting at General Aviation airports, including runway and taxiway edge lights, obstruction lights, runway guard lights, windsocks and guidance signs — its research specifically evaluates reliability, safety, photometric and design compliance, and siting requirements.
A solar runway light is an equipment item. A solar AGL system is an integrated aviation visual-aid system. The engineering question is therefore not only "Does the solar lamp work?" — it is "Can the complete system reliably provide the required visual guidance for the intended operation?"
More Than a Solar Lamp
A solar AGL system is an integrated aviation visual-aid system — energy, storage, electronics, optics, geometry, control and environment must all work together.
Decentralized, Not Uncontrolled
Solar AGL can remove much of the conventional centralized distribution architecture — but "decentralized" does not mean the system can go unmonitored or unverified.
FAA Solar Research
The FAA's decentralized solar-lighting research evaluates reliability, safety, photometric compliance, design compliance, solar suitability and siting requirements across multiple visual-aid types.
Conventional AGL vs Solar AGL
| Parameter | Conventional AGL | Solar AGL |
|---|---|---|
| Energy source | Utility / generator | Solar energy |
| Storage | Usually centralized backup | Local battery |
| Distribution | Series circuit / common infrastructure | Decentralized |
| CCR | Commonly used | Usually not required for standalone units |
| Isolation transformer | Common in series circuits | Normally not part of standalone architecture |
| Cabling | Extensive underground network | Minimal or local wiring |
| Control | Centralized | Local, wireless or hybrid |
| Installation | Fixed infrastructure | Decentralized units |
| Grid dependence | High | Low or none |
| Site dependency | Electrical infrastructure | Solar resource and environmental conditions |
Why Solar AGL Is Important
Solar technology can reduce the need for extensive electrical infrastructure at locations where grid-connected AGL would be difficult or expensive. FAA airport technology research specifically identifies solar as an alternative for small, remote and off-grid airports.
Where Solar AGL Can Be Used
Runway Edge Lighting
Can potentially eliminate the need for a conventional underground cable network.
Taxiway Edge Lighting
Independent lighting where underground cable infrastructure is impractical.
Threshold & Runway End Lighting
Correct colour, quantity, spacing and orientation relative to edge lighting.
REIL Systems
Additional flashing, intensity, synchronisation and control considerations apply.
Obstruction Lighting
Particularly useful for isolated obstructions where grid connection is difficult.
Runway Guard Lighting
Part of the runway-incursion prevention arrangement — control and fail-safe behaviour matter.
Airfield Guidance Signs
Internally illuminated signs with day/night control and battery-backed operation.
Windsock Lighting
Illumination for visual wind indicators with defined operating periods.
Temporary & Remote Lighting
Construction, emergency, remote airfields and temporary runway configurations.
Remote Airfields & Small General Aviation Airports
Remote Airfields
Solar AGL is especially relevant where grid power is unavailable, cable installation is difficult, the runway is far from the electrical substation, terrain is difficult, infrastructure development is expensive, airport operations are intermittent, or independent lighting units are desirable. The site should nevertheless undergo proper engineering evaluation before deployment.
Small General Aviation Airports
The FAA is evaluating solar-powered lighting at General Aviation airports as part of its ongoing airport technology research. Its test arrays include several types of airfield visual aids — solar AGL should be viewed as a potential system architecture, not simply an alternative lamp technology.
Temporary vs Permanent Decentralized SAGL
Temporary Solar AGL
Used for construction, emergency restoration, temporary runway configuration, remote works, temporary taxi routes and short-duration operations. The designer should consider both the solar energy system and the approved temporary airfield layout.
Permanent Decentralized Solar AGL
A typical concept: individual light + integrated PV + battery + local control + wireless communication — removing much of the conventional centralized distribution architecture. However, "decentralized" does not mean "uncontrolled."
Basic Solar AGL Architecture
Solar AGL Reliability Chain
System reliability cannot be described using LED lifetime alone — every stage in the chain has its own failure possibility, and a fault anywhere breaks the visual guidance function.
Sun available → PV healthy → controller healthy → battery healthy → driver healthy → LED healthy → optics correct
Photovoltaic Energy Conversion & Solar Radiation
Solar panels convert incident solar radiation into electrical energy. The actual energy available varies — therefore rated panel wattage alone is not sufficient for system sizing.
Solar AGL Energy Chain & Panel Sizing
Every stage introduces losses, so PV capacity must be sized against the entire system energy requirement, not only the LED rating.
Daily PV Energy ≈ PV Capacity × Effective Solar Hours × System Efficiency
System efficiency accounts for losses in PV conversion, charge controller, battery charging, battery discharge, wiring and driver electronics. The actual design should use site-specific solar data.
LED technology is highly useful for solar AGL because LEDs generally provide high luminous efficiency compared with older light-source technologies. However: low electrical power ≠ low engineering requirement. The LED still needs to produce the required intensity, colour, beam distribution, angular coverage and reliability.
Battery Storage & Autonomy
The battery provides energy when solar generation is unavailable, making it one of the most critical components in a solar AGL system.
Battery Autonomy is the period for which the system can operate without meaningful solar charging.
Required autonomy = expected no-sun operating period + design reserve
The required value should be determined from the operational requirement, site climate, lighting duty cycle and applicable design criteria. Do not use a generic autonomy figure for every airport.
Energy Budget & Example Calculation
Daily energy consumption = lighting load + control load + communication load + monitoring load, then add allowances for charge losses, battery losses, temperature effects, aging, reserve capacity and seasonal solar availability.
Example: a unit uses a 10 W LED system for 10 hours/night → Lighting energy = 10 W × 10 h = 100 Wh/night. Once controller and battery losses are included, the required stored energy will be greater than 100 Wh. A simple "10 W × 10 hours" calculation is not enough for final system sizing.
Solar AGL Sizing Estimator
Adjust the sliders for a single lighting unit to see a simplified planning estimate for daily energy, required battery capacity, and required PV capacity. This is a conceptual sizing tool only.
Duty Cycle, Pilot Control & Wireless Networking
Duty Cycle
Not every visual aid operates continuously — continuous operation, reduced intensity, standby mode, pilot activation, scheduled, flashing or event-driven operation each strongly affect energy consumption.
Pilot-Controlled SAGL
Pilot command → radio receiver → local controller → lighting units. The exact control arrangement must be designed and tested for the equipment and operational environment.
Wireless Networking
Used for ON/OFF commands, intensity control, status feedback, fault reporting, battery information, configuration and remote diagnostics via radio, proprietary RF, mesh, cellular or other site-specific technology.
Wireless Failure
Communication loss, interference, receiver failure, antenna damage, software fault, power loss or configuration error — the design should define what happens when communication is unavailable.
Local Autonomy
An individual light can potentially keep operating even if the central network or adjacent lights fail — but this behaviour is equipment-specific and must not be assumed without documentation.
Centralized vs Decentralized
Centralized: control centre → network → field equipment. Decentralized: local controller → individual unit. Hybrid: central control → wireless network → local autonomous control.
Centralized, Decentralized & Hybrid Control
Control Centre → Network → Field Equipment
Local Controller → Individual Unit
Central Control → Wireless Network → Local Autonomous Control
Each architecture has different failure modes. A distributed system can make single-unit failures easier to isolate, but whether a single failure is operationally acceptable depends on light function, location, pattern, required serviceability and applicable operating rules. Do not treat decentralization as automatic redundancy.
Single, Multiple & Common-Cause Failure
Single Light Failure
Depends on light function, location, pattern, required serviceability, applicable operating rules and failure distribution — not automatically acceptable just because it's an isolated unit.
Multiple-Light Failure
The more important question is often "what happens when several adjacent lights fail?" — possible causes include severe weather, battery depletion, communication failure, charging failure or control malfunction.
Common-Cause Failure
Poor solar siting, extended cloud cover, incorrect configuration, firmware problems, radio interference, excessive dust or a battery design problem can affect many individual units simultaneously.
Redundancy Strategy
Conventional AGL uses multiple feeders, separate transformers, backup power and central monitoring. Solar AGL instead uses distributed units, individual storage, multiple independent power sources, wireless redundancy and local autonomous operation.
Panel Orientation, Integrated Geometry & Shading
Solar Panel Orientation
Geographic location, solar path, panel angle, seasonal performance, horizon obstruction and airfield geometry all affect energy production. The best solar orientation and the best aviation-light orientation are not necessarily the same.
Integrated Solar-Light Geometry
Panels may be mounted directly on the light housing, or use separate panels, adjustable brackets, multiple panels, vertical PV surfaces or remote PV modules. The mechanical arrangement should maintain required aviation visibility while maximizing energy collection.
Shading
Buildings, trees, vehicles, aircraft, fences, signs, structures, terrain and even other solar units can shade a panel — a panel partially shaded for part of the day may significantly reduce energy production.
A site that appears unobstructed at noon may have significant morning or evening shading — inspect across the full expected solar path and seasonal changes
Soiling, Temperature & Battery Chemistry
Five factors that decide how a solar light performs: soiling, temperature, chemistry, battery management and the controller.
AGL Visual Encyclopedia: Renewable energy integration Asset health monitoring
Solar Panel Soiling & Cleaning
Dust accumulates from aircraft movement, construction, unpaved shoulders, wind and vehicle traffic. A maintenance plan should specify inspection frequency, cleaning method, water requirements, cleaning safety and damage inspection — never use aggressive cleaning methods that can damage PV surfaces.
Temperature Effects
PV and battery performance both depend on temperature — high daytime temperature, low nighttime temperature, seasonal changes and enclosure temperature all matter. Thermal design is therefore important in hot climates.
Battery Chemistry
Lead-acid, AGM, gel, lithium-based and other rechargeable chemistries each differ in temperature tolerance, cycle life, weight, maintenance, safety, cost, replacement availability and charging strategy.
Battery Management System
Lithium-based systems commonly require cell monitoring, overcharge protection, over-discharge protection, over-temperature protection, current protection and balancing — the exact architecture depends on battery chemistry.
Charge Controller & MPPT
The controller manages charge regulation, overcharge protection, load management, low-voltage disconnect and battery monitoring, using MPPT or PWM. MPPT can extract more usable energy under changing solar conditions where panel and battery voltages differ significantly.
LED Driver & Intensity Control
The driver must maintain appropriate current, voltage, regulation, protection and dimming behaviour — a poor driver can reduce optical stability even when battery and PV are healthy. Higher intensity means higher energy demand, so intensity, battery capacity and PV capacity should be designed together.
Photometry Remains Essential
A solar light is still an aviation light. Solar technology changes the energy source, not the fundamental visual-aid requirement.
Do not determine compliance only by asking "Can I see the light?" — a light can be visibly bright and still have an incorrect photometric distribution.
A perfectly charged battery cannot correct an incorrectly aimed light. Check runway axis, taxiway axis, threshold orientation, runway end orientation, light azimuth, light elevation and spacing. Photometry + geometry = useful engineering verification.
Solar Light Types & Their Particular Considerations
Seven solar light types and the main checks each one still needs.
AGL Visual Encyclopedia: Portable PAPI PAPI system overview Low-intensity obstruction lights
Runway & Taxiway Edge
Verify runway/taxiway geometry, light spacing, colour, intensity, orientation, mechanical stability and power endurance — particular attention at intersections, holding positions, curves, aprons and construction zones.
Threshold & Runway End
Correct colour, quantity, spacing and orientation, and a clear relationship with runway edge lights, are essential for correct runway-end communication to approaching/departing aircraft.
Runway End Identifier
Evaluate flashing pattern, intensity, beam direction, synchronisation, control and visibility. Do not assume a generic solar beacon can perform the function of an aviation REIL.
Approach Lighting
Considerably more complex than edge lighting — needs defined geometry, accurate positioning, correct visual pattern, stable power, appropriate optical output, suitable mechanical supports and operational approval.
Solar PAPI
PAPI is not merely a lamp — precise geometry, elevation, aiming angles, unit relationship, surveying, photometric characteristics and approach-path considerations all apply. A solar power supply does not simplify these requirements.
Obstruction Lighting
Particularly useful for isolated obstructions where grid connection is difficult — solar sizing and battery autonomy are especially important because maintenance access may be limited.
Airfield Guidance Signs
Consider sign brightness, day/night control, LED load, battery capacity, solar panel sizing, communication and inspection access.
Windsock Lighting
Consider required operating period, windcone location, battery autonomy, environmental exposure, visibility and maintenance access.
Runway Guard Lighting
Part of the runway-incursion prevention arrangement — evaluate location, control, fail-safe response and monitoring, not as a simple replacement lamp.
Solar AGL, CCRs & Isolation Transformers
A standalone solar lighting unit usually does not use the conventional CCR → 6.6 A series circuit architecture — instead it commonly uses PV → battery → LED driver. This is one of the biggest conceptual differences between conventional and decentralized solar AGL. Standalone solar units generally do not require the isolation-transformer architecture used in a conventional constant-current series circuit.
Never connect a solar unit to a conventional 6.6 A series circuit without equipment-specific technical justification. Any hybrid system connected to conventional AGL infrastructure must be specifically engineered.
Hybrid Solar AGL
Sources, conversion and control, then airfield power: where solar sits in a wider supply.
AGL Visual Encyclopedia: Renewable energy integration Standby power and UPS
A hybrid system can combine solar, battery, grid and generator sources to improve operational flexibility.
Primary energy
Energy storage
Auxiliary charging
Emergency backup
Solar + Grid Charging
A hybrid controller can allow batteries to be charged from solar PV, a grid AC/DC system, or a generator — such systems require suitable power-management logic and protection.
Solar + Generator
A generator can serve as backup when solar generation is insufficient, battery state of charge is low, prolonged bad weather occurs, or emergency operations extend beyond normal design assumptions. Automatic generator integration requires additional control engineering.
Worst-Case Conditions, Reserve Margin & Sizing Sequence
System design should consider the period when energy demand is high and solar energy availability is low — this is typically more important than designing around average annual sunlight. Before designing, obtain site-specific data for global irradiation, seasonal variation, effective peak sun hours, cloud conditions, temperature and historical weather. A site-specific energy model is preferable to generic internet-based assumptions.
A solar AGL system should not normally be designed so that daily solar generation ≈ daily load with no reserve — weather varies, panels soil, batteries age, temperatures change and system losses vary.
Determine operational duty
Calculate electrical load
Determine required autonomy
Determine battery energy
Required battery energy ≈ Daily load × Required autonomy ÷ usable battery fraction, with allowances for temperature, aging, conversion and wiring losses.
Determine PV energy requirement
PV capacity ≈ Required daily energy ÷ (Effective solar energy × system efficiency).
Select PV module, controller & LED system
Validate against worst-case conditions
Environmental Protection, Anchorage & Aircraft Clearance
Exposure, water ingress, anchorage, aircraft clearance and frangibility checked as one assembly.
AGL Visual Encyclopedia: Moisture ingress Sealing system Water ingress prevention
Environmental Exposure
Rain, dust, UV, heat, humidity, salt, wind, jet blast, wildlife and insects — selected equipment should be suitable for the environmental conditions of the installation.
Corrosion & Water Ingress
Corrosion can affect mounting hardware, battery terminals, connectors, PV structures, housing and fasteners. Water ingress points include compartments, cable glands, connectors, housing joints, switches, antennas and PV connections — often causing intermittent or delayed failure.
Mechanical Protection & Anchorage
Consider impact, wind, jet blast, ground movement, vibration, maintenance activity and vehicle exposure. After strong wind or jet-blast exposure, inspect for movement, tilt, foundation movement, bracket damage and cable displacement.
Safety
Electrical protection, battery protection, mechanical stability, aircraft clearance, personnel safety, fire considerations, cable safety and maintenance access — battery technologies with specific thermal or chemical hazards need additional protection.
Aircraft Clearance
Solar panels can be physically larger than conventional fixtures — check against runway/taxiway strip, obstacle-free areas, clearance surfaces, wingtip clearance, propeller clearance and jet blast exposure.
Frangibility
Where frangibility is required, the complete assembly — light, solar panel, support and foundation — must be evaluated. A compliant lamp attached to an unsuitable support does not automatically make the complete installation compliant.
Portable vs Fixed Solar AGL
Portable PAPI units on temporary legs, fed by a battery or solar power box.
AGL Visual Encyclopedia: Portable PAPI Temporary runway lighting for works
Portable Solar AGL
Designed primarily for rapid deployment, temporary use, emergency response and construction. See our Portable Airfield Ground Lighting (PAGL) guide for the complete portable-lighting engineering picture.
Fixed Solar AGL
Designed for longer-term deployment, remote infrastructure, dedicated airfield applications and permanent or semi-permanent installations. Applicable design and certification requirements can differ between portable and fixed solar equipment.
Solar AGL Testing
Electrical
Battery, charging, current, voltage.
Optical
Intensity, colour, beam distribution.
Solar
Charging performance and energy production.
Mechanical
Stability and anchoring.
Control & Communication
Local and remote commands; range and reliability where applicable.
Operational
Correct visual pattern and configuration.
Night-Endurance Test
Assesses initial battery state, lighting intensity, operating duration, battery voltage, low-voltage protection, automatic dimming and shutdown behaviour — performed under controlled conditions and interpreted against the design requirement.
Photometric Test During Battery Discharge
Particularly valuable — a solar light may start the night with adequate intensity but perform differently after extended discharge. Evaluate both the beginning and end of the required operating period; performance must be maintained throughout.
Solar AGL Maintenance Checklist
Click any item to mark it complete.
PV & Panel
Battery & Electrical
Optical & Housing
Control & Structural
Troubleshooting Solar AGL
Then ask: why did the battery become discharged? This second question is essential.
Suppose the light is OFF and battery voltage is low. Replacing the battery may restore the light — but the real cause could be a damaged PV panel, a failed charge controller, a heavily soiled panel, or incorrect charging configuration. A replacement without root-cause analysis only resets the failure.
Common Solar AGL Failures
Tap a symptom to see possible causes.
Battery does not charge
Possible Cause
- PV panel damaged or disconnected
- Charge controller failure
- Heavily soiled panel
- Incorrect charging configuration
Battery charges but light output is low
Possible Cause
- LED driver fault
- Battery degradation
- Optical contamination
- Wrong operating mode
Light works only for a few hours
Possible Cause
- Battery aged / reduced capacity
- Undersized PV for the load
- Excessive duty cycle
- Poor charging during the day
Solar panel is shaded
Possible Cause
- New obstruction (building, vegetation, vehicle)
- Seasonal sun-angle change
- Adjacent structure or aircraft
Light has moved from surveyed position
Possible Cause
- Wind or jet-blast displacement
- Loose anchoring
- Ground movement
- Vehicle/maintenance contact
Wireless control does not work
Possible Cause
- Communication loss / interference
- Receiver or antenna failure
- Software fault
- Network configuration error
LED healthy but beam misaligned
Possible Cause
- Housing rotated or tilted
- Incorrect mounting angle
- Bracket movement
Connector moisture ingress
Possible Cause
- Damaged seal
- Loose connector
- Cable gland failure
- Housing joint failure
Solar AGL Common Mistakes
Standards & Regulatory References
AC 150/5345-50B (portable runway/taxiway lights and REIL for temporary use) and AC 150/5345-46F (Specification for Runway, Taxiway, Heliport, and Vertiport Light Fixtures) are both currently listed as active. The FAA has also published research material on solar-powered lighting and airport solar technology, with its current airport-technology program evaluating decentralized solar lighting to inform future guidance.
Current research evaluates reliability, safety, photometric compliance, design compliance, solar suitability and siting requirements — across multiple visual-aid types, showing solar AGL is being assessed as an integrated airport infrastructure concept, not only a runway-edge product.
Solar technology does not replace the applicable aerodrome visual-aid requirements. The actual applicable ICAO, national and airport-specific requirements must be established for the particular project.
DGCA / State aviation authority requirements, approved airport drawings and specifications, and airport operational procedures and approvals as applicable.
There is an important distinction between solar technology requirements and aviation visual-aid requirements. The solar system provides the energy; the airfield visual-aid requirements determine what the resulting aviation lighting system must achieve. The designer should identify the applicable visual-aid specification, photometric requirement, equipment specification, aerodrome design requirements, national aviation authority requirements and airport-specific requirements.
Solar AGL Design Workflow
Assess solar resource
Define hours & modes
Calculate demand
Size battery & autonomy
Size PV for worst case
Select controller & driver
Verify photometry
Verify location & alignment
Anchoring & resistance
Local/remote operation
Fault & status
Electrical/solar/optical/mechanical
Record installation
Solar AGL Quick Reference & Four Key Questions
Four questions every Solar AGL engineer should ask:
- Is there enough solar energy?
- Is there enough stored energy?
- Is the light producing the required optical performance?
- Is the complete installation correctly positioned and operationally suitable?
The Final Solar AGL Engineering Principle
Solar AGL is not "AGL without cables." It is a different system architecture with a different set of engineering challenges. The engineer must simultaneously manage solar energy, battery storage, LED electronics, optics, geometry, control, communication, environmental conditions, mechanical stability and operational requirements.
The most important design question is not "How many watts is the solar panel?" It is: "Can this complete system reliably deliver the required aviation visual guidance throughout the intended operating conditions?"
Precision AGL Academy takeaway: the sun provides the energy, the battery provides continuity, the electronics control the light, and photometry proves what the pilot actually receives.
Quick Knowledge Check
Q1. Why is rated PV panel wattage alone not sufficient for system sizing?
Q2. A standalone solar lighting unit commonly uses which architecture, instead of a CCR / 6.6 A series circuit?
Q3. A light is OFF and the battery voltage is low. What should the engineer do first?
Q4. Battery autonomy should be determined from:
Q5. Why can a solar light be electrically and optically healthy but still fail the photometric check?
Explore More AGL Engineering
AGL Fundamentals
Build your understanding of the complete Airfield Ground Lighting system.
Open AGL Fundamentals →AGL Design & Electrical Engineering
Layout, series circuits, CCR sizing, transformers, cable design and control.
Open AGL Design →AGL Photometry
Verify the optical performance of the installed system.
Open AGL Photometry →Portable Airfield Ground Lighting
Temporary, emergency and rapid-deployment airfield lighting.
Open Portable AGL →Runway Lighting Systems
Edge, threshold, end and centreline lighting in the permanent system.
Open Runway Lighting →Taxiway Lighting Systems
Edge, centreline, lead-on/lead-off and stop-bar guidance.
Open Taxiway Lighting →LED Airfield Ground Lighting
The LED engineering that pairs with PV-battery architecture in solar AGL.
Open LED AGL →Surge Protection & Lightning Mitigation
Protecting exposed PV-battery installations from transients.
Open Surge Protection →AGL Testing & Inspection
Verifying off-grid systems before operational use.
Open Testing & Inspection →Obstruction Lighting & Marking
A common application for standalone solar-powered lighting.
Open Obstruction Lighting →Independent Power. Uncompromised Performance.
From PV sizing to battery autonomy, from anchoring to photometric verification — explore the complete AGL knowledge base for solar, portable and permanent lighting engineering.
Explore the AGL Engineering Knowledge Hub
Fundamentals
Standards & Compliance
Runway, Taxiway & Approach Lighting
Surface Movement & Safety
PAPI
Electrical Engineering & Power
Photometry & Testing
Maintenance, Inspection & Safety
Resources, Documentation & Careers
Frequently Asked Questions
Q1What is solar airfield ground lighting (SAGL)?
SAGL is an airfield-lighting system powered partly or entirely by photovoltaic energy, converted to electrical energy, stored in batteries where required and used to operate aviation lighting equipment. A typical unit integrates a solar panel, charge controller, rechargeable battery, LED driver, aviation light source and optical system.
Q2How does solar AGL differ from conventional AGL?
Conventional AGL uses utility or generator power, centralized backup, series-circuit distribution, CCRs, isolation transformers and extensive underground cabling with centralized control. Solar AGL uses solar energy with local batteries, decentralized units, minimal or local wiring and local, wireless or hybrid control. CCRs and isolation transformers are usually not required for standalone units.
Q3Is a solar runway light the same as a solar AGL system?
No. A solar light is an equipment item, while a solar AGL system is an integrated aviation visual-aid system. The engineering question is whether the complete system can reliably provide the required visual guidance for the intended operation.
Q4Why is solar AGL important?
It can reduce the need for extensive electrical infrastructure where grid-connected AGL would be difficult or expensive, and FAA airport technology research identifies solar as an alternative for small, remote and off-grid airports. Benefits include reduced cabling and trenching, easier deployment in remote locations, independent unit operation and local energy storage.
Q5Where can solar AGL be used?
Applications include runway and taxiway edge lighting, threshold and runway end lighting, REIL, obstruction lighting, runway guard lighting, airfield guidance signs, windsock lighting, and temporary and remote lighting. Suitability depends on the exact operational requirement and applicable standards.
Q6Where does solar AGL fit best?
Remote airfields where grid power is unavailable or cable installation is difficult, and small general aviation airports. The site should still undergo proper engineering evaluation before deployment.
Q7What is the FAA researching in solar airfield lighting?
The page says the FAA is evaluating decentralized solar lighting at General Aviation airports, including runway and taxiway edge lights, obstruction lights, runway guard lights, windsocks and guidance signs. The research evaluates reliability, safety, photometric and design compliance, solar suitability and siting requirements.
Q8Does decentralized solar AGL mean uncontrolled?
No. Solar AGL can remove much of the conventional centralized distribution architecture, but decentralized does not mean the system can go unmonitored or unverified.
Q9What is the difference between temporary and permanent solar AGL?
Temporary solar AGL is used for construction, emergency restoration, temporary runway configurations, remote works, temporary taxi routes and short-duration operations, and must consider both the solar energy system and the approved temporary layout. Permanent decentralized solar AGL typically combines an individual light with integrated PV, battery, local control and wireless communication.
Q10Do the advantages of solar remove the need for aviation-grade design?
No. These advantages do not eliminate the need for aviation-grade design and verification. Energy, storage, electronics, optics, geometry, control and environment must all work together.
Engineering & Expert Notes
Size for the Worst Season, Not the Average
EnergyUse conservative solar data and allow for dust, shading and ageing.
Battery Health Decides Autonomy
BatteriesTemperature and cycling reduce capacity. Monitor and plan replacement.
Check the Duty Cycle Assumptions
SizingVerify the operating hours and intensity assumed in the energy budget.
Test Control and Wireless Links
ControlVerify range and fallback behaviour in real conditions.
Keep Panels and Optics Clean
MaintenanceDirt reduces both charging and light output.
Record Performance Over Time
RecordsTrend battery and output data to spot degradation.
Understand SAGL. Build Your Engineering Skills.
You now understand how Solar Airfield Ground Lighting converts photovoltaic energy into reliable aviation visual guidance — from PV and battery sizing to control, photometry, environmental protection and troubleshooting.
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Important Notice, Disclaimer & Limitation of Liability
Please read before relying on any content on this page or on any record downloaded from it.
- Purpose and intended users. This page is an independent educational and informational reference for competent, suitably trained and authorised airfield ground lighting (AGL) and aerodrome personnel. It is not professional engineering, legal or regulatory advice, and using it creates no professional or client relationship. Learning-path and Academy references describe stages of learning only and are not a certification, accreditation or authorisation.
- Safety. Work on series circuits, constant current regulators (CCRs), isolating transformers, cables, connectors and lighting fixtures can be fatal. Always apply the aerodrome’s permit-to-work and isolation/LOTO procedures, prove dead, use correctly rated instruments and PPE, and follow the manufacturer’s instructions. Nothing here authorises work on live equipment or the bypassing of any safety device or interlock.
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