18W Solar Street Light – 12 Hours Backup | EPISTAR | IP65

Overview

The 18W Solar Street Light (Double Body Model 1121, 6 Window) is the highest-wattage and most capable variant in the Double Body series, designed for wide colony main roads, housing society primary entrance roads, large parking lots, rural district highways, industrial estate perimeter roads, and farmhouse estate main access routes across India. With 480 LED 5730 EPISTAR chips producing a combined 180W output in cool white and a 3.2V 25Ah LiFePO4 battery rated for 12 Hours of illumination at installation heights of 4–6 metres, the 18W Double Body 1121 delivers the highest LED count, the widest 6 Window beam distribution, and the largest battery capacity in the Double Body series. Alongside the 12W model, the 18W is one of only two Double Body variants to provide multi-night backup, making it the correct specification for high-traffic, high-priority outdoor road lighting in housing society and rural district contexts.

LED Performance & Light Output

The Double Body 1121 integrates 480 LED 5730 EPISTAR chips across a 6 Window array — the most extensive optical configuration in the Double Body series — at a combined 180W output in cool white. The 6 Window array provides the broadest beam spread in the series, directing light across wide road cross-sections of 5–8 metres at the 4–6 metre installation height, making the 18W model appropriate for housing society main roads, wide colony streets, large parking areas, and rural district lane junctions where the 4 Window 12W model’s coverage would be insufficient at the required pole height. EPISTAR 5730 chips at 480 count produce high lumen density with good thermal distribution across the 6 Window housing, ensuring consistent cool white output across India’s outdoor temperature range without localised overheating at the LED board level.

Battery – LiFePO4 25Ah Capacity & Backup

The 3.2V 25Ah LiFePO4 battery in the Double Body 1121 is 25% larger than the 12W model’s 20Ah unit, proportionally matching the higher 180W LED draw to deliver the same 2-night backup performance at greater output. The 25Ah LiFePO4 specification provides a substantial energy reserve that sustains 2-night operation through sensor-managed dimming across low-to-medium traffic environments, and extends battery reserve across consecutive monsoon overcast days in coastal and north-eastern Indian states where multiple-day cloud cover can prevent full daily charging. Compared to competing 18W solar street lights at similar price points on Amazon.in and IndiaMart that use lead-acid or standard Li-ion batteries, the Double Body 1121’s LiFePO4 specification provides five or more years of daily operation without the capacity degradation, sulphation risk, and safety concerns inherent in those alternative chemistries.

Body Build & Weatherproofing

The Double Body 1121 carries IP65 weatherproofing, certifying complete dust and directional water protection. At 82 × 24.5 × 10 cm, the 18W Double Body is the longest unit in the series, accommodating the 480-chip 6 Window LED array within a slim 10 cm depth profile. The 50mm pole specification is consistent with the 6W, 9W, and 12W Double Body models, enabling a single pole standard for all four wattages in mixed-zone colony and society projects. At 4–6 metres installation height, the 18W model’s IP65 sealed housing must withstand the increased wind exposure inherent at greater mounting heights, particularly in coastal and high-altitude locations across India. The sealed housing protects the 480-chip LED array and the 25Ah LiFePO4 battery from the moisture, dust, and thermal cycling that represent the primary failure modes for unattended outdoor solar street lights.

Smart Controls & Operating Modes

The 1121 incorporates the standard Double Body radar sensor and remote control with the full mode set: OFF, ALWAYS, INDUCTION, and 2H, 4H, 6H timed induction. At 180W LED output, sensor management is critical for 2-night performance — without dimming, constant 180W draw would exhaust the 25Ah LiFePO4 battery in approximately 9 hours, well short of two full dusk-to-dawn cycles. Sensor-managed dimming at the 10%–100%–15% pattern reduces average consumption to approximately 60–70W on medium-traffic housing society roads, enabling the 25Ah battery to sustain 2-night operation. For wide housing society main roads and large parking areas — the primary deployment sites for the 18W model — the 6H timed induction mode combined with INDUCTION radar is the recommended configuration, providing full 180W brightness during the 6–10 PM high-activity window and sensor-dimmed operation for the remaining overnight hours.

Solar Panel & Charging Efficiency

The 5V 23W monocrystalline solar panel in the Double Body 1121 is the highest-rated panel in the Double Body series, providing the daily energy harvest needed to replenish the 25Ah LiFePO4 battery within the standard 6–8 hour charging window. At 23W panel output, the harvest-to-storage ratio of the 18W model is well-calibrated for the 2-night backup specification, and monocrystalline efficiency of 19–22% maintains reliable charging under India’s most challenging irradiance conditions — including the 90+ day monsoon season in the Western Ghats and north-east, and the low-sun-angle winter days of Delhi, Haryana, and Punjab. The factory-integrated panel angle ensures consistent orientation without on-site adjustment across bulk installations by contractors and developers.

Installation & Mounting

The Double Body 1121 installs without external wiring or grid connection. The pre-assembled unit mounts on a 50mm pole at 4–6 metres — the highest installation range in the Double Body series — enabling coverage of wide colony main roads and large open parking areas at appropriate luminance levels. The 4–6 metre range bridges the boundary between residential and entry-level commercial outdoor lighting, making the 18W Double Body the appropriate specification for housing society primary access roads, large farmhouse estate main drives, rural district road lighting, and industrial estate perimeter roads where the 12W 3–5 metre range is insufficient. Supplied at 3 units per carton, reflecting the larger unit size. The shared 50mm pole specification with the 6W, 9W, and 12W Double Body models simplifies supply chain management for projects deploying multiple wattages across different zones.

Technical Specifications

Ideal Applications

• Housing colony narrow footpaths and internal pedestrian lanes
• Residential society compound perimeter and garden lighting
• Rural gram panchayat village lane and alley lighting
• Farmhouse boundary perimeter and garden access track lighting
• Gated community security and entry gate lighting
• Small parking lot perimeter and two-wheeler zone lighting
• School campus internal pathways and boundary wall lighting