A 35W autonomous street light can pair a 70Wp TOPCon solar panel with 250Wh LiFePO4 storage to support up to 5 days of autonomy, while keeping pole-side installation around 30 minutes per unit. For procurement teams evaluating roads, parks, compounds, industrial estates, and remote access lanes, that specification is more useful than a generic lamp wattage claim.
System Architecture for Off-Grid Lighting
A lithium iron phosphate LFP solar light replaces the grid circuit with a compact PV-battery-LED node. Instead of trenching, conduit, copper cable, distribution cabinets, metering, reinstatement, and utility coordination, most electrical scope shifts into a factory-integrated assembly.
Typical project sizing sits between 20W and 35W LED loads. A 20W pathway fixture can use about 150Wh of LiFePO4 storage, while a 35W community-road fixture commonly uses 250Wh. With smart dimming profiles, that range supports 4-5 rainy days of reserve. The battery system should include BMS protection for over-charge, over-discharge, short-circuit, and low-temperature conditions.
For charging, the practical panel range is 40Wp-70Wp monocrystalline TOPCon. LED efficacy should be specified above 170 lm/W, which translates to approximately 3,400 lm from 20W or 5,950 lm from 35W. These numbers matter because buyers need dusk-to-dawn service without oversizing poles, panels, or batteries.
Procurement Specs Worth Putting in the RFQ
| Item | Practical specification |
|---|---|
| LED load range | 20W-35W |
| Solar panel range | 40Wp-70Wp monocrystalline TOPCon |
| Battery range | 150Wh-250Wh LiFePO4 |
| Light output examples | 3,400 lm at 20W; 5,950 lm at 35W |
| Autonomy target | 4-5 rainy days |
| Installation benchmark | 30 minutes per all-in-one pole |
| Turnkey EPC price guide | $300-$420 per 35W unit |
| Volume discounts | 5% at 50+, 10% at 100+, 15% at 250+ units |
Financial comparison should include both unit cost and avoided civil-electrical work. For grid-fed lighting, the baseline should account for trenching, cabling, cabinets, and 12h/night energy consumption. On this basis, the cited project payback range is 2.5-4 years.
Monitoring and Compliance
For portfolios of 50-5,000 poles, 4G or LoRa monitoring can reduce fault isolation time by 30%-50% by reporting device status instead of waiting for night patrols or resident complaints. SOLARTODO typically positions these systems for B2B projects that need quotation support, shipping coordination, financing input, and engineering review.
Before municipal approval, align the RFQ with the relevant standards: IEC 61215 and IEC 61730 for PV modules, IEC 60598 for luminaires, IEC 62133 for battery safety, and UL 8801 where solar luminaire requirements apply.
For engineering notes and project sourcing context, visit solartodo.com
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