28W Solar Street Light – 12-16Hr Backup | 732 LED | IP65

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 in cool white and a 3.2V 30Ah LiFePO4 battery providing 12–16 hours of illumination 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. The 55mm pole specification, IP65 rating, 5V 30W monocrystalline panel, radar sensor, and wireless remote control complete the specification of the most capable standard all-in-one unit in the King Model series.

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 IndiaMart and Amazon.in competing products at this wattage 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.

Battery – LiFePO4 30Ah Capacity & 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 12–16 hours of sensor-managed dusk-to-dawn operation. At 30Ah capacity, the King Model 1247’s battery is correctly matched to the extended backup claim at 28W output, and provides a meaningful reserve for partial-charging days during India’s monsoon season — relevant for the housing society main road and colony boulevard installations typical of the 28W tier, where consecutive overcast days during the Western Ghats or north-east monsoon can prevent full battery replenishment from the 30W monocrystalline panel. The 30Ah LiFePO4 specification compares directly against the 8–12Ah to 20Ah batteries found in most competing 28W all-in-one solar street lights on Amazon.in and IndiaMart — a specification comparison that will be immediately apparent to procurement-experienced housing society committee members and municipal tender evaluators. LiFePO4 at 30Ah delivers 2,000+ cycles, exceeding five years of daily operation without capacity degradation.

Body Build & Weatherproofing

The King Model 1247 carries IP65 weatherproofing, certifying complete dust ingress protection and water jet resistance. 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 and 30Ah LiFePO4 battery. 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 confirmed by IndiaMart buyer RFQ patterns 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 that is appropriate for the standard 55mm GI poles used in Indian housing society and municipal road lighting projects. IP65 sealing protects the sealed LED driver and 30Ah LiFePO4 battery from India’s full range of outdoor climate stresses year-round.

Smart Controls & Operating Modes

The King Model 1247 incorporates the same radar sensor and wireless remote control as the 24W model, with identical operating modes: OFF/ON, AUTO, RADAR, 3H, 5H, 4+4H, and 4+6H. At 350W LED output, the sensor 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-managed dimming at the 10%–100%–15% pattern 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 12–16 hours under ideal conditions. The 4+4H and 4+6H timed remote modes are particularly suitable for 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.

Solar Panel & Charging Efficiency

The 5V 30W monocrystalline solar panel integrated into the King Model 1247 is 20% higher in rated output than the 24W model’s 25W panel, providing the proportionally greater daily energy harvest required to replenish the 30Ah LiFePO4 battery within the 6–8 hour charging window. At 30W panel output paired with 30Ah battery capacity, the 28W King Model’s charge ratio is well-calibrated for the 12–16 hour backup specification across most Indian solar zones. Monocrystalline efficiency of 19–22% maintains charging performance under India’s most challenging seasonal irradiance conditions, including the 90+ day monsoon in the Western Ghats and north-east India, the coastal overcast seasons of Andhra Pradesh and Tamil Nadu, and the short winter solar days of Delhi and the Indo-Gangetic plain. For large housing society and township developer projects specifying the 28W King Model for primary boulevard lighting, the monocrystalline panel’s low annual output degradation rate — typically 0.3–0.5% per year versus 0.5–0.8% for polycrystalline — provides a measurable long-term performance advantage across the 10–15 year project life typically specified in housing society common area lighting contracts.

Installation & Mounting

The King Model 1247 installs without external wiring, underground cable, or grid connection. The pre-assembled unit 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 4–6 metre mounting heights used for 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

Specification	28W / Model 1247 / King Model
Model	1247
LED	732 Pcs 0.5W LED
LED Power	350W
Solar Panel	5V 30W Monocrystalline
Battery	3.2V 30Ah LiFePO4
Charging Time	6–8 Hours
Lighting Time	12–16 Hours
Light Colour	Cool White
Pole Diameter	55mm
Installation Height	6–8 Metres
Unit Size	73 × 38.5 × 15 cm
Qty Per Carton	2 Pieces
Weatherproofing	IP65
Remote Control	Included
Sensor	Radar (Motion)

 

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