Second generation solar street lighting: technology evolution, applications and case study

Transcription

1 Second generation solar street lighting: technology evolution, applications and case study Olivier SAINT GIRONS Sunna Design Business Development Manager for Southern Africa & Indian Ocean 1

2 Outdoor lighting Outdoor lighting is a key element of development Road safety People safety and security Economic development Social development The rise of outdoor solar lighting for public and private applications

3 First generations of solar street lights Oversiz ed solar panel TYPICAL LEAD ACID SOLAR LIGHT EXPECTED LIFETIME IN HOT CLIMATE 1 to 2 YEARS Buried Sealed battery Too short lifespan Unadapted batteries Very prone to theft High cost of maintenance Poor service Require overspec d poles & foundations Through innovation and R&D and new market drivers, new products have come up in the past 5 to 6 years

4 Second generation : integrated solar street lights - ISSL EXPECTED LIFETIME IN HOT CLIMATE 10 to 12 years 10 to 12 years lifespan Adapted to high temperatures Compact battery and smaller solar panel Theft-proof features No technical maintenance Smart management system of the energy

5 Second generation : battery technology Lead-Acid VRLA battery Lithium LiFePO4 battery NiMH battery Temperature range -20 C /+50 C -20 C /+60 C -40 C /+80 C Lifespan at 60% DoD (C10-20 C) Lifespan at 60% DoD (C10-40 C) Replacement of the battery over 10 years 800 cycles (2 years) cycles (4 years) cycles (15 years) 480 cycles (1,3 years) 900 cycles (2 years) cycles (11 years) 6 times minimum 3 times minimum None In hot climates, for solar street light applications, the optimal technology is NiMH NiMH has a higher initial cost of purchase but its resistance to heat and deep cycling leads to an incomparable lifespan, making the total cost of ownership much lower than with any other battery technologies

6 2nd generation : smart battery management systems & connectivity ANTI-BLACKOUT FUNCTION Automatic adaptation of lighting intensity to ensure service continuity APP CONNECTIVITY & REMOTE MONITORING

7 Rationale for the use of solar street lighting No trenches, no cabling, no heavy civil works Easy to install 5 mn! No electricity bills Access road to an eco-estate - KZN Sustainable solution

8 Case study 2 nd generation solar street lights in Nigeria Case study of a 15 km road solar lights - grid street light cost vs ISSL costs On-grid 140W Solar CAPITAL REQUIREMENTS Streetlight Streetlight Lantern R5 800,00 R42 050,00 8m pole R2 900,00 R2 900,00 Civil work R26 100,00 R1 740,00 Installation and Commissioning R4 350,00 R2 900,00 Total Purchase cost (per unit) R39 150,00 R49 590,00 Total Capital Investment Required R ,00 R ,00 Net Investment Requirement R0,00 R ,00 Case study from a suburban city close to Lagos in Nigeria DIRECT ELECTRICAL COST Electrical load of lamps + driver loss W - Energy Consumed Per Year kwh - Electrical Demand Savings kwh Total cost of electricity / kwh R0,75 Total Cost of Energy (per year) R ,00 R0,00 Direct Electrical Savings (per year) R0,00 R ,00 MAINTENANCE Maintenance cost including clean-up, lamp, ballast, ignitor & capacitor replacement for on-grid lights (per year) R ,50 R ,00 Maintenance Savings R0,00 R ,50 Total Operating Cost (per year) R ,50 R ,00 Total Savings on the 1st year R0,00 R ,50 Payback Period 2,9 years

9 Applications Solar streetlight systems are ideal for a number of applications: - New developments where the availability, cost or timeline of new power supply is an issue - Existing locations where the cost or impracticality of digging trenches is too high - Locations where electricity costs are high - Remote areas rural development - Emergency installations - Temporary installations - Eco-sensitive landscapes

10 A game changer While the initial technology had high limitations, the integrated solar street lights with NiMH batteries have become a viable option for many applications. Installation in Africa including SA and Latin America number thousands of products each year on public roads and streets, estates, off-grid locations, industries, mines and many others.

11 Thank you! Durban University of Technology O l i v i e r S A I N T G I R O N S o s s u n n a - d e s i g n. c o m