This guide explains how to build a solar-powered outdoor light system with commercial-grade performance. The system can illuminate parking areas, driveways, or road signs.

Main Components

  1. Solar array (most expensive component, available in various sizes)
  2. High-efficiency DC lamp
  3. Charge controller (protects battery, manages charging)
  4. Sealed battery

Lighting Fixture Options

  • 35W low-pressure sodium street light with built-in time controls
  • 13W compact fluorescent fixture for wall/ground mounting
  • Low-voltage fixtures with photocells and polished reflectors for maximum light output

System Controls

  • Use charge controllers with timer functions (e.g., Trace C12 or MorningStar Sunlight)
  • Adjust light operation to 2-10 hours after sunset or dusk-to-dawn
  • Select battery type (flooded vs sealed) for optimal performance

Installation Example

  • 13W fluorescent fixture in planter boxes
  • Pole-mounted solar array
  • Weatherproof enclosure with charge controller and 12V gel-cell battery

Sizing Calculations

For a 13W lamp operating 4 hours/night:
(13W × 4h)/12V = 4.33Ah/day
Add 30% efficiency loss: 5.8Ah/day
For 3-day cloudy weather storage: 17.4Ah battery capacity

Wiring Requirements

  • Use 10-gauge stranded copper wire for 12V circuits
  • Include fuses for battery and load protection
  • Use high-temp ‘USE’ cable for solar module connections
  • Connect to ground rod with #6 solid copper wire

Recommendations

  • Use 40W solar array + 50Ah battery for 5h/night operation
  • 80Ah battery + 2×50W modules for 35W load
  • Avoid discharging batteries below 50% capacity
  • Adjust operating times based on local weather conditions
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