Across the world, cities are moving away from cable-dependent street lighting toward resilient, off-grid solar systems that cut operating costs and carbon emissions. Amman is no exception. With electricity tariffs under pressure, dense historic neighborhoods, and growing demand for safe public lighting, the city needs a solution that is fast to deploy, robust in winter, and financially predictable over 10–20 years. Inlux Solar’s integrated solar street lighting systems are engineered for these exact constraints. Our mast-mounted, off-grid luminaires eliminate underground cabling and transformers, minimize disruption in narrow streets, and maintain reliable autonomy during cold, rainy winters. In other words: upgrade Amman’s streets with zero trenching and full winter backup, while meeting international lighting and safety standards.

Engineering Analysis: The Challenge of Lighting Amman

Amman’s climate is a classic Eastern Mediterranean profile with distinct dry and wet seasons, but its specific combination of altitude, winter cold snaps, and urban morphology creates non-trivial challenges for solar street lighting. Average solar resource is favorable: Amman typically receives approximately 5,0-5,5 horas de sol de pico (PSH) por dia on an annual basis, which is sufficient for well-designed solar systems to achieve high reliability. Summers are hot and dry with high irradiance and minimal cloud cover, while winters from November to March bring most of the annual rainfall, frequent overcast days, and occasional snowfall, especially at higher elevations in West and North Amman.

For grid-tied AC street lighting, this climate is relatively easy to manage. For solar systems, however, the design must balance several competing factors:

• Winter irradiance variability: Rainy and cloudy days between November and March reduce daily energy harvest. Systems must be sized for worst-case multi-day low-irradiance periods, not summer averages.
• Ambient temperature swings: Day–night temperature ranges and winter cold snaps can push battery cells toward the lower end of their operating window. Poorly managed lithium batteries suffer from reduced capacity, lithium plating, or accelerated degradation.
• Urban shading and narrow streets: In older neighborhoods, buildings and trees create partial shading and limit optimal panel orientation. Narrow streets also make trenching for cables disruptive and expensive.
• Dust and pollution: Dust accumulation on panels, combined with intermittent rain, leads to soiling losses if not accounted for in system sizing and maintenance planning.

Amman’s topography—hills, valleys, and dense built-up areas—further complicates conventional grid-based lighting. Extending medium-voltage lines, installing distribution transformers, and trenching low-voltage cables through narrow streets and historic districts is not only costly, but also socially disruptive, involving road closures, noise, and risk to existing underground utilities.

Inlux Solar’s Technical Solution: The Off-grid Solar Masts with No Trenching, High Wind Load Poles and Wide Temperature Batteries Architecture

Inlux Solar designs and manufactures integrated solar street lighting systems specifically engineered for challenging environments like Amman. Our solution for Jordanian municipalities and EPC contractors is a fully off-grid solar mast architecture that eliminates underground cabling and transformers while providing reliable lighting throughout the winter season.

Each lighting point is a self-contained system comprising:

• High-efficiency monocrystalline PV module mounted on a dedicated bracket optimized for Amman’s latitude and shading patterns.
• Wide-temperature lithium battery pack (typically LiFePO₄ or equivalent) with an advanced Battery Management System (BMS) tuned for Amman’s thermal profile.
• High-lumen, low-glare LED luminaire with asymmetric optics for roadways and pedestrian streets, designed to meet EN 13201 / CIE standards where required.
• Hot-dip galvanized, high wind load pole with engineered foundations for Amman’s soil and wind conditions.
• Intelligent charge controller and lighting controller with programmable dimming profiles and multi-day autonomy logic.

Because each mast is independent, there is no trenching, no cable routing between poles, and no dependency on the grid. This is particularly advantageous in:

• Historic and older neighborhoods with narrow streets and dense underground utilities.
• Hilly areas where cable routing would require complex civil works.
• Peri-urban and new development zones where grid extension is delayed or costly.

Lógica do sistema de gerenciamento de bateria (BMS)

The heart of any off-grid solar street light in a climate like Amman’s is the battery system. Inlux Solar uses industrial-grade lithium iron phosphate (LiFePO₄) or equivalent chemistries with an operating range typically from -20 °C to +60 °C, combined with a BMS specifically configured for the city’s seasonal and diurnal temperature profile.

Key BMS and energy management features tailored to Amman include:

• Low-temperature charge protection:
  The BMS monitors cell temperature via embedded thermistors. When cell temperature approaches 0 °C, charge current is gradually derated to prevent lithium plating. Below a defined threshold (e.g., -5 °C to 0 °C depending on cell specification), charging is suspended until the battery warms, either naturally during the day or via controlled self-heating (for certain models). This avoids internal damage and prevents long-term capacity loss.
• Adaptive depth-of-discharge (DoD) control:
  During extended cloudy periods in winter, the controller automatically adjusts maximum nightly energy consumption by modifying dimming profiles. For example, after detecting 2–3 consecutive low-yield days, the system can reduce output from 100% to 70–80% during off-peak hours, limiting DoD to extend autonomy to 3–5 nights without full recharge. This is critical to maintain lighting continuity in December–January.
• Seasonal dimming profiles:
  Amman’s night length and traffic patterns vary seasonally. Our controllers support seasonal profiles that can be pre-programmed at the factory: higher output and longer operation in winter evenings, with strategic dimming after midnight when traffic is minimal, and slightly reduced output in summer when ambient temperatures are higher and visibility is better. This balances user comfort, safety, and battery life.
• Cell balancing and health monitoring:
  The BMS includes active or passive cell balancing to maintain uniform state-of-charge (SoC) across cells, preventing early degradation of weaker cells. Voltage, current, temperature, and cycle count are monitored and logged. Optional remote monitoring allows municipalities to track SoC, state-of-health (SoH), and fault alarms across their network.
• Overcurrent and short-circuit protection:
  Given the risk of vandalism or accidental damage in urban environments, the BMS and controller incorporate fast-acting overcurrent protection and electronic fuses. This protects the battery from external faults and reduces fire risk.
• Thermal management of enclosure:
  Battery enclosures are thermally insulated and, where appropriate, placed in shaded or semi-buried compartments at the base of the pole to minimize direct solar heating in summer and to buffer temperature swings in winter. The BMS uses temperature data to avoid both low-temperature charging and high-temperature stress.

This BMS logic is not generic firmware; it is parameterized for Amman’s actual climate data and design assumptions: 5.0–5.5 PSH annual average, with conservative derating for winter, and expected minimum ambient temperatures down to approximately -5 °C in certain districts. The result is a battery system that maintains high usable capacity and cycle life, even after multiple winters.

Integridade estrutural

Mechanical and structural engineering are critical for long-term reliability in Amman’s environment. Our high wind load poles and mounting structures are designed based on wind speed data, topography, and the specific exposure category of urban streets, open squares, and highways.

Key structural design elements include:

• High wind load poles:
  Poles are typically designed for ultimate wind speeds in the range of 120–150 km/h (site-specific), accounting for gust factors and the additional sail area of the PV module and luminaire. Finite element analysis (FEA) is used to verify deflection limits at the top of the pole to maintain optical aiming and avoid excessive vibration that could fatigue welds and bolts.
• Hot-dip galvanization and corrosion protection:
  All steel components (poles, brackets, anchor cages) are hot-dip galvanized to ISO standards, providing a zinc coating thickness suitable for Amman’s semi-arid but seasonally wet environment. This significantly reduces the corrosion rate compared to painted or electro-galvanized steel, ensuring structural integrity over 20+ years.
• Optimized PV module brackets:
  PV brackets are engineered to support the module at an optimal tilt angle for Amman’s latitude (approximately 30–35°), with slight adjustments possible to prioritize winter energy yield. The brackets are designed to minimize torsional loads on the pole and to resist uplift and overturning moments during high winds.
• Anti-vibration and locking hardware:
  In narrow streets that can act as wind corridors, dynamic loading can cause micro-movements that gradually loosen bolts. We use high-strength bolts with locking nuts and, where necessary, anti-vibration washers. Critical connections are designed with redundancy to prevent catastrophic failure even if one element loosens over time.
• Foundations matched to soil conditions:
  Foundation design (anchor cage, concrete footing dimensions, and reinforcement) is calculated based on geotechnical assumptions for Amman’s typical soils—ranging from compacted fill in urban streets to rockier substrates in hilly areas. Safety factors are applied for overturning, sliding, and bearing capacity to ensure stability under combined wind and dead loads.
• Proteção contra ingresso e roteamento de cabos:
  Enclosures for drivers, controllers, and batteries are rated to at least IP65–IP67, with gaskets and cable glands designed to prevent moisture ingress during heavy winter rains. Internal cable routing avoids sharp bends and abrasion points, reducing long-term failure risk.

By combining robust mechanical design with advanced electrical and battery engineering, Inlux Solar delivers a mast architecture that is not only compliant with international standards but also specifically adapted to Amman’s climatic and urban conditions. This minimizes lifecycle maintenance interventions and ensures that the total cost of ownership remains predictable.

ROI Calculation: Grid vs. Solar in Jordan

Let’s look at the numbers. For municipal and contractor decision-makers in Amman, the key question is not whether solar works technically—it does—but whether it is financially competitive against traditional AC street lighting when all costs are fully accounted for: trenching, cabling, transformers, electricity, and maintenance.

Below is a simplified 5-year total cost of ownership (TCO) comparison for a typical 30–40 W LED street light installation in Amman, comparing:

• Traditional AC Street Light: Grid-connected LED luminaire with underground cabling and a share of transformer cost.
• Inlux Solar Street Light: Fully off-grid integrated solar mast with battery and controller, no trenching, no grid connection.

Assumptions (illustrative, for planning purposes only):

• Installation of 1 lighting point; scale linearly for larger projects.
• Currency: USD (for international comparability).
• Electricity tariff for municipal loads in Jordan: approx. 0.12–0.18 USD/kWh (varies by contract and time; 0.15 USD/kWh used for estimation).
• Operating hours: 11–12 hours per night on average (~4,000 hours/year).
• LED power: 40 W nominal for both AC and solar (equivalent lighting level).
• Trenching and cabling costs are higher in dense urban areas; mid-range values used here.

Fator de custo (Por poste, 5 anos)	Luz de rua CA tradicional	Luz de rua solar Inlux
Valas e cabeamento Civil works per pole.	USD 350 – 600 Includes asphalt cutting, sand bedding, reinstatement. High labor.	US$ 0 Self-contained mast. No inter-pole cabling.
Transformer Share Amortized capacity.	USD 150 – 250 Share of MV/LV transformer & switchgear.	US$ 0 Não é necessária conexão com a rede elétrica.
Conta de luz de 5 anos 40W LED usage.	USD 130 – 170 Based on $0.15/kWh. Subject to tariff variations.	US$ 0 Solar-powered. No electricity purchase.
Manutenção (5 anos) Inspection & Repair.	US$ 80 - 150 Driver replacements, cable joint repairs, fault tracing.	USD 60 – 120 Visual inspection & cleaning. No battery replacement needed.
TOTAL INFRA & OPEX (5 Years) Excl. Pole/Light Hardware	$710 – $1,140 / polo	$60 - $120 / pole (Maintenance Only)

When hardware costs (pole, luminaire, brackets) are added, the initial CAPEX of a high-quality off-grid solar mast is typically higher than a basic grid-connected luminaire. However, in dense or difficult areas of Amman where trenching is expensive and disruptive, the avoided civil works and transformer costs significantly narrow or even reverse this gap. Over a 5–10 year horizon, the total cost of ownership for Inlux Solar systems is often lower, especially when the value of avoided road closures, reduced permitting complexity, and environmental benefits are considered.

For greenfield developments at the outskirts of Amman where grid extension is not yet available, the economics are even more favorable: the cost of extending MV lines and building new substations can far exceed the incremental cost of off-grid solar masts, while also adding long-term electricity expenses.

Installation Best Practices for Amman Soil Conditions

Proper installation is essential to realize the performance and lifespan that Inlux Solar designs into its products. The following best practices are recommended for EPC contractors and municipal teams installing off-grid solar street lights in Amman and surrounding areas.

• Foundation depth and sizing:
  For typical 6–9 m poles used in urban streets, design foundation depth in the range of 1.2–1.8 m, depending on soil bearing capacity and pole height. In compacted urban fill, a common practice is a concrete footing of approximately 0.6 m × 0.6 m × 1.5 m with appropriate rebar and anchor cage. In rockier ground, depth may be reduced with increased lateral anchoring. Always verify with local geotechnical data and applicable standards.
• Pole orientation and PV module tilt:
  In Amman’s northern hemisphere location (latitude ~31–32°N), orient PV modules toward true south to maximize annual energy yield. Module tilt angle in the range of 25–35° is generally optimal, with a slight bias toward higher tilt (e.g., 30–35°) if winter performance is prioritized. During installation, ensure there is no shading from nearby buildings, trees, or signage during key solar hours (10:00–15:00) in winter.
• Wind resistance and anchor design:
  For exposed sites (hills, open roads), use higher design wind speeds and verify anchor cage and foundation reinforcement accordingly. Ensure that anchor bolts are correctly aligned, fully embedded in concrete with proper cover, and tightened to specified torque after curing. Use non-shrink grout where specified between base plate and foundation to distribute loads uniformly.
• Soil backfilling and compaction:
  When excavations are made in roadsides or sidewalks, backfill around foundations with properly compacted material in layers to avoid settlement and water accumulation around the base. Avoid creating “water pockets” that can accelerate corrosion or frost damage in winter. Ensure surface reinstatement (asphalt, paving stones) is flush and stable to prevent trip hazards and water pooling.
• Cable management and ingress protection:
  Even though the system is off-grid and trenchless, internal cabling within the pole and between components must be protected. Use UV-resistant, appropriately sized cables; secure them to avoid chafing; and ensure all glands and gaskets are properly tightened to maintain IP rating. During installation, avoid drilling additional holes in enclosures or poles that could compromise corrosion protection or allow water ingress.
• Commissioning and settings verification:
  After mechanical installation, verify BMS and controller settings for Amman-specific profiles: time zone, dusk/dawn thresholds, dimming schedule, and seasonal profiles. Confirm that the system enters correct operating modes over at least one dusk-to-dawn cycle before handing over to the client.

Following these practices ensures that the theoretical advantages of Inlux Solar’s engineering translate into real-world reliability and reduced maintenance for Amman’s municipalities and contractors.