28 Watt | 24 Hours | Long Backup | IP64 Rating | Day & Night Sensor | Motion Sensor | MPPT Fast Charging – Solar Street Light

Overview

The 28W Solar Street Light (King Model 1247) is the higher-wattage variant in the King Model series, designed for wide housing society primary boulevards, large colony main streets, gated community primary access roads, panchayat district market roads, industrial estate entrance roads, large parking areas, and farmhouse estate primary driveways across India. Featuring 732 Pcs 0.5W LED chips at a combined 350W output and a 3.2V 30Ah LiFePO4 battery providing 24 Hours of Long Backup at installation heights of 6–8 metres, the King Model 1247 delivers 20% more LED chips, 17% greater combined LED output, and 20% larger battery capacity than the 24W model — positioning it for wider road applications at taller pole heights. Built with IP64 weatherproofing, a Day & Night Sensor for automatic dusk-to-dawn switching, a Motion Sensor for intelligent brightness management, and MPPT Fast Charging technology for maximum daily solar harvest, the 1247 is the most capable standard all-in-one unit in the King Model series — with no external wiring or grid connection required.

LED Performance & Light Output

The King Model 1247 integrates 732 Pcs 0.5W LED chips — 20% more than the 24W model’s 610-chip array — at a combined 350W output in cool white. The higher chip count at 6–8 metre installation height is appropriate for wider road cross-sections of 6–10 metres, where the additional LED density produces a broader beam footprint at greater mounting height without sacrificing ground-level illuminance. At 350W combined LED output across 732 chips, the 1247 is the highest-output standard all-in-one unit in the King Model series and among the highest LED chip counts available at the 28W wattage tier in the Indian market, where competing products typically list LED arrays of 100–300 chips. The 0.5W per chip distribution maintains even thermal management across the extended array, supporting consistent lumen output over the operational lifespan without the localised LED board hotspots that accelerate lumen depreciation in higher-wattage-per-chip competing LED configurations. The Day & Night Sensor ensures automatic activation at dusk and switch-off at dawn, with the Motion Sensor managing brightness intelligently to sustain the full 24-hour Long Backup across a complete dusk-to-dawn cycle.

Battery – LiFePO4 30Ah Capacity & 24-Hour Long Backup

The 3.2V 30Ah LiFePO4 battery in the King Model 1247 provides 20% more energy storage than the 24W model’s 25Ah unit, supporting the higher 350W LED draw across 24 hours of sensor-managed dusk-to-dawn operation — a Long Backup specification that directly addresses the most common complaint about competing solar street lights on housing society main roads and colony boulevards, where lights failing before dawn are a recurring buyer issue. At 30Ah capacity, the King Model 1247’s battery is correctly matched to the extended backup claim at 28W output, and the combination of MPPT Fast Charging replenishment and Motion Sensor dimming provides a meaningful reserve for partial-charging days during India’s monsoon season — relevant for housing society main road and colony boulevard installations where consecutive overcast days during the Western Ghats or north-east monsoon can prevent full battery replenishment. LiFePO4 at 30Ah delivers 2,000+ charge-discharge cycles — exceeding five years of daily operation without capacity degradation — and avoids the sulphation failure mode of lead-acid alternatives and the thermal runaway risks of standard Li-ion chemistry in high-ambient-temperature Indian summer conditions.

Body Build & Weatherproofing – IP64

The King Model 1247 carries an IP64 weatherproofing rating, certifying complete dust ingress protection and water jet resistance across India’s full range of outdoor climate environments. At 73 × 38.5 × 15 cm, the 28W King Model is larger than the 24W model — 8 cm wider and 5 cm deeper — to accommodate the 732-chip LED array, 30Ah LiFePO4 battery, and MPPT Fast Charging controller within a sealed housing. The 55mm pole diameter specification is identical to the 24W model, enabling the same pole standard to be used across both King Model wattages within a single project — a logistics advantage for housing society compound and colony road lighting tenders where mixed wattages are often specified across different road width zones. At 6–8 metres installation height, the unit’s 73 cm width and 15 cm depth present a moderate wind loading profile appropriate for the standard 55mm GI poles used in Indian housing society and municipal road lighting projects. The sealed IP64 construction protects the LED driver, MPPT charging controller, and 30Ah LiFePO4 battery from India’s full range of outdoor climate stresses year-round.

Smart Controls – Day & Night Sensor | Motion Sensor

The King Model 1247 operates fully automatically through two integrated sensing systems — a Day & Night Sensor and a Motion Sensor — ensuring hands-free dusk-to-dawn performance without any manual switching. The Day & Night Sensor activates the unit automatically at dusk and switches it off at dawn across all seasons, providing consistent year-round coverage on wide housing society main roads and colony boulevards where manual daily switching is not operationally feasible. The Motion Sensor manages a three-state brightness sequence: 10% standby brightness during inactive periods, 100% full brightness on motion detection, and 15% brightness for 30 seconds post-motion before returning to standby. At 350W LED output, sensor-managed dimming is more consequential for extended backup performance than at 24W — without intelligent dimming, constant 350W draw would deplete the 30Ah LiFePO4 battery in approximately 6 hours, less than half a full dusk-to-dawn winter cycle in northern India. Sensor dimming reduces average consumption to approximately 50–70W on low-to-medium traffic housing society main roads and colony boulevards, enabling the 30Ah battery to achieve the full 24-hour Long Backup under ideal conditions. The included wireless remote control provides additional flexibility with OFF/ON, AUTO, RADAR, and timed modes at 3H, 5H, 4+4H (4 hours full brightness followed by 4 hours induction), and 4+6H — the timed configurations being particularly suited to housing society main entrance roads and large parking lots where sustained full brightness is required during the 6–10 PM peak period and sensor-managed operation is appropriate through the night.

MPPT Fast Charging – 5V 30W Monocrystalline Solar Panel

The King Model 1247 integrates MPPT (Maximum Power Point Tracking) Fast Charging technology with its 5V 30W monocrystalline solar panel — a significant charging efficiency advantage over the PWM (Pulse Width Modulation) controllers used in most competing solar street lights at this wattage. MPPT technology continuously tracks and locks onto the solar panel’s maximum power output point across changing irradiance conditions throughout the day, extracting up to 30% more usable charging energy from the same panel compared to PWM alternatives. This is directly consequential for the 24-hour Long Backup specification — the 30Ah LiFePO4 battery must be fully replenished within the available daily solar window, and MPPT’s superior harvest efficiency ensures complete recharge within 6–8 hours of direct sunlight even during the reduced-irradiance conditions of India’s monsoon season and the shorter, lower-angle winter solar days of north India (November–January). The 30W panel output — 20% higher than the 24W model’s 25W panel — is proportionally matched to the 30Ah battery capacity, ensuring the 24-hour Long Backup specification is achievable across most Indian solar zones. Monocrystalline efficiency of 19–22% maintains charging performance under India’s most challenging seasonal conditions, including the 90+ day monsoon in the Western Ghats and north-east, and the short winter solar days of Delhi and the Indo-Gangetic plain. The factory-integrated panel orientation removes on-site tilt adjustment requirements for project-scale deployments.

Installation & Mounting

The King Model 1247 installs without external wiring, underground cable, or grid connection. The fully pre-assembled unit — solar panel with MPPT Fast Charging controller, 30Ah LiFePO4 battery, 732-chip LED module, Day & Night Sensor, Motion Sensor, and wireless remote receiver — mounts on a 55mm pole at 6–8 metres height using the included bracket. At 6–8 metres, the 28W King Model covers the upper residential and entry-level commercial road lighting installation height range — appropriate for wide colony boulevards of 7–10 metres cross-section, housing society main entrance roads, panchayat market roads, and industrial estate main access routes where the 4–6 metre mounting height of the 24W model would be insufficient for adequate coverage width. The shared 55mm pole specification with the 24W King Model enables a single pole standard for both wattages within the same project, a confirmed logistics advantage for housing society developers and municipal contractors managing mixed-zone road lighting with different wattage requirements per zone. The off-grid design is directly relevant for rural district market road and panchayat highway approach lighting where grid connection per pole is commercially and technically impractical. Supplied at 2 units per carton, reflecting the larger unit dimensions.

Technical Specifications

Ideal Applications

• Wide housing society primary boulevards and main entrance roads
• Large colony main streets and gated community primary access roads
• Panchayat district market roads and highway approach lighting
• Industrial estate main access road and large parking area lighting
• Farmhouse estate primary driveway and estate perimeter road
• Semi-commercial road lighting for off-grid township developments
• Rural district road lighting under panchayat and state schemes