Solar vs Mains Powered Traffic Signal: Total Cost of Ownership Comparison
Introduction
Choosing between solar and mains power for a traffic signal affects the initial cost, the operating cost and the long-term reliability. This guide compares the two over a 20-year lifetime.
Installation Cost
| Cost | Solar | Mains |
|---|---|---|
| Signal heads | Same | Same |
| Controller | Solar variant (+10-15%) | Mains variant |
| Panel + battery + mount | $1,500-3,000 | $0 |
| Mains connection | $0 | $5,000-20,000 (depends on distance) |
| Civil works (trenching) | $0 | $2,000-10,000 |
| Total install | $4,000-7,000 | $7,000-30,000 |
For a site more than 200 m from the nearest mains supply, solar is cheaper to install. For a site adjacent to mains, mains is cheaper.
Operating Cost
Mains-powered signals use electricity. At 100 W average load (modern LED), 24/7 operation: - Daily energy: 2.4 kWh - Annual cost at $0.15/kWh: $131
Solar-powered signals have no energy cost but need battery replacement every 3-5 years (AGM) or 8-12 years (LiFePO4). At AGM cost of $400 every 4 years, that's $100/year.
20-year operating cost: - Solar (AGM, 5 replacements): $2,000 - Solar (LiFePO4, 2 replacements): $2,800 (but slower replacement) - Mains: $2,620
20-Year TCO
| Scenario | Install | 20-yr Op | TCO |
|---|---|---|---|
| Solar (AGM), remote site | $5,000 | $2,000 | $7,000 |
| Solar (LiFePO4), remote site | $8,000 | $2,800 | $10,800 |
| Mains, adjacent to grid | $7,000 | $2,620 | $9,620 |
| Mains, 500 m from grid | $25,000 | $2,620 | $27,620 |
For most urban sites near the grid, mains and solar (LiFePO4) have similar TCO over 20 years. For remote sites, solar is much cheaper.
Featured Products
GAOQIAO supplies both solar traffic signals and mains-powered signals. See the solar ROI calculation guide.
Conclusion
Solar is cheaper for remote sites; mains is cheaper for adjacent-to-grid sites; both are similar in between. GAOQIAO supplies both. Send us your distance to grid and we will return a TCO comparison.
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Frequently Asked Questions
How reliable is solar in winter?
With proper sizing (panel + battery for the worst-case month), solar is reliable year-round. GAOQIAO systems are designed for 3-day autonomy minimum.
What if the site needs more than 3 days autonomy?
GAOQIAO supplies extended battery packs for 5-day and 7-day autonomy. Larger panels may be needed to recharge the bigger bank.
Can I switch from solar to mains later?
Yes. The controller and heads are the same; only the power supply changes. GAOQIAO controllers support both modes.
Relevant GAOQIAO products
These public GAOQIAO catalogue pages are related to the guide. Open them for the representative description, then confirm the latest drawing and configuration before ordering.
- Traffic signal controllersWired and solar controllers with 6, 22, 44 and 56 output options.
- LED traffic signal heads200mm, 300mm and 400mm signal heads with MUTCD, EN12368, GB14886 compliance.
- Signal polesVertical, signal arm and double-arm poles for any intersection geometry.
- Spare parts and accessoriesSpare LED modules, lenses, visors, surge arrestors and anchor bolts.