Quick answer
Solar and grid-powered street lights should be compared over the same service requirement and analysis period. Solar can avoid grid extension and energy bills but needs adequate storage, cleaning and a replacement plan. Grid LED can use existing infrastructure but incurs electricity and network maintenance costs. Neither architecture is always cheaper.
1. Compare the same lighting service
Fix the road class or other applicable lighting requirement, layout, operating hours and acceptable interruptions before reviewing prices. Verify each option using the selected luminaire’s photometry and the real geometry. A lower-cost option that fails the lighting brief is not a like-for-like alternative.
For existing grid infrastructure, check whether the cable, poles and protection can be reused. For a new connection, obtain location-specific prices for trenching, reinstatement, cabling, metering and utility connection. For solar, include PV, storage, control, mounting and foundations rather than the luminaire alone.
2. Use a common cost checklist
| Cost group | Grid LED | Solar |
|---|---|---|
| Initial installation | Luminaire, electrical network, civil works and commissioning | Luminaire, PV, battery, control, structure and commissioning |
| Recurring operation | Electricity, inspections, cleaning and repairs | Inspections, panel cleaning, repairs and any communications fee |
| Planned replacement | Components and access labour according to the project plan | Battery and other components according to model evidence and operating conditions |
| Service risk | Grid outages and network faults | Weather, shading, storage limitations and component faults |
3. Worked example: the result can be a tie
Consider a ten-year, undiscounted teaching example per light. Assume grid installation costs USD 1,000 and grid operating costs USD 100 per year. Assume solar installation costs USD 1,500, annual solar maintenance USD 30, and one USD 200 battery replacement in year five. These are illustrative assumptions, not product prices or a promise of battery life.
Grid total = 1,000 + 10 × 100 = USD 2,000. Solar total = 1,500 + 10 × 30 + 200 = USD 2,000. Under these assumptions neither is cheaper. Adding USD 500 of necessary grid-extension work raises the grid total to USD 2,500 while the assumed solar total remains USD 2,000. Changing battery replacement timing or cleaning costs can change the result again.
This example excludes financing, inflation, tax and residual value. A procurement comparison should include the agreed treatment of those items and discount each cash flow consistently. Record the quotation dates and avoid presenting an illustrative total as a market benchmark.
4. Check the energy and maintenance assumptions
For the grid option, calculate annual kWh from actual input power and the dimming schedule. For the solar option, calculate nightly Wh, usable battery energy at its operating temperature, winter PV production and recharge after a low-generation period. Maintenance access, dust, shading and replacement labour can matter as much as the battery purchase price.
A remote road with costly trenching merits a different comparison from a dense urban road with a functioning network. Where continuity is critical, also evaluate grid reliability, solar reserve and any hybrid architecture. Hybrid systems need a defined changeover design and fault behaviour; simply combining two power sources does not guarantee continuous service.
5. Turn the comparison into a purchasing decision
Request the same bill-of-quantities scope from each supplier, together with IES files, a layout calculation, the energy budget, pole and foundation requirements and written warranty terms. Identify who handles installation and service. Use the payback guide for a preliminary financial screen, and compare the relevant AC LED and split solar configurations against the same brief.
Frequently asked questions
Are solar street lights always cheaper over ten years?
No. The result depends on installed costs, existing infrastructure, energy prices, maintenance and replacement timing. Compare both systems against the same lighting requirement.
Which costs are often missed in a comparison?
Grid civil works and connection charges, solar battery replacement and cleaning, access labour and any communications charges. State what each quotation includes.
Does a lower price prove equivalent performance?
No. Verify photometry, operating schedule, reliability requirements and the solar energy budget. Otherwise the cheaper option may simply provide a different service.
Discuss your project
Send the location, layout, lighting schedule and required documentation to sales@mclsolar.com. Ask for the proposed configuration, available model evidence and written commercial terms.