Solar at Night

Solar at Night Solar LED Applications Minson Lu Meteor Solar LED Lighting

Contents • Introduction • Why Solar LED combined? • How it works • Technologies • Advantages • Applications – Safety – DIY Products – Construction • Q&A

Introduction • Fol lowing the trend for the ut i l izat ion of alternative energy sources, solar energy has experienced explosive growth. Even so, at this point in time, from the point of view of economic efficiency, the production cost of solar energy is quite high. This is why solar power sources are often integrated with energy efficient LED lighting products. . • Market forecasts predict that by the year 2010, LED lighting market will surpass 30 million and the predicted growth rate from 2006-2010 will reach 20%-30%. .

Off-grid Solar LED Lighting Market Million Dollars Year Source: Strategies Unlimited

Major areas of development Generally speaking development is occurring more rapidly in the US and Europe. However , some supp l i er s a l so marke t so l ar powered LED lighting products to 3rd World countries or developing countries such as India and in the Middle East. Areas with a lack of pub l i c i n f r as t r uc t u r e use a correspondingly larger number of solar products. .

How to design a good Solar Product • Good Solar Product should have four important features. Longer illumination life Lower electrical consumption Independent system Better Solution

Solar VS LED: practical applications PV LED Energy properties Capability achieved Energy saving Year invented 1950s 1920s Type of illumination Light to electricity Electricity to light Source: Lumileds™ Source: Research Institute Sustainable En

Solar VS LED: practical applications • According to the above it can be seen that Solar power is suitable to be used with LEDs for the creation of stand alone (off grid) lighting devices. PV LED Production/type of electrical current DC DC Conversion rate/amount of current low low

How it works • Self-contained solar powered LED lighting systems (off-grid) work by absorbing solar radiation in the daytime, which is converted to electrical energy by passing through the power converter. This energy stored in a storage device. At night the controller allows the stored power to be released to illuminate the LEDs. It is safe to say that the solar power–LED light combination is an optimum model for energy e f f i c i e n t a l t e r n a t i v e l i g h t i n g s o l u t i o n s .

How it works Daytime Night time Charge Solar panel Power storage LED Discharge Photo sensor

Technologies • Solar LED Applications: the most important technologies involved are shown below Solar Panel Technologies LED Technologies Power Storage Technologies

Solar Panel Technologies • Producers of solar lighting products are concerned with increasing the effectiveness of the solar panel--that is, how to absorb the maximum amount of solar energy with the limited space available. . • The principle application methods include: – Increasing the size of the solar panel – Solar Concentrator

Solar Panel Technologies • Solar Concentrator Reflector Design Homemade Solar Concentrator Defense Industry Daily, LLC HacknMod.com

LED Technologies • The energy conversion efficiency of Solar Panels is not large. Manufacturers must take full advantage of the limited power when come finding the best ways to produce l i gh t . . • At the present time the assistance of optics design software helps to make product design easier. .

LED Technologies • Optical Design Solar energy light gathering analysis LED Light Model Analysis

LED Technologies • Adjusted Control of Light Distribution Collimating Lens Design

LED Technologies • Adjusted Control of Light Distribution Divergent Lens Design © Solar Technology

Power Storage Technologies • Power Storage is indeed the greatest challenge faced in developing solar LED Lighting products. The lifespan of Solar Panels is about 15-20 years, that of LEDs more that 10 years, but that of traditional batteries only 3 years. • The current most effective solutions are: – Advanced Charge Circuit Design – Ultracapacitor

Power Storage Technologies – The special circui t design reduces the frequency of the di scharge of the storage dev i ce, thereby avo i d i ng producing the memory effect. In addition the use of high quality devices extends the service l ife of the storage device. . • Optimized Charge Circuit Design

Power Storage Technologies • Ultracapacitor – Not only does the use of the ultracapacitor increase product stability, but it also solves the most common problem encountered with today’s small-sized solar products: Short Battery Life. – At the present time, ordinary batteries last about 2 years, but the ultracapacitor increases the battery life to7-10 years.

Power Storage Technologies Battery EDLC Cycle Life 200~1000 >>100000 Life-Time 2~3 years 7~10 years Discharge Curve • Comparison between Batteries and Ultracapacitors

Power Storage Technologies • Comparison between Batteries and Ultracapacitors

Applications Safety Landscape Construction

Application • Safety –Sign –Beacon –Warning light

Application • Landscape (DIY Product) –Garden Light – Functional DIY Lighting

Application • Construction –Solar Street Light –Solar Paver / Ground Light

Solar LED Products Demo

The End Thank you for your attention.

RkJQdWJsaXNoZXIy NTkzMzk=