How Solar Yard Lights Work?
- Author Yoni Levy
- Published December 23, 2010
- Word count 686
How Solar Yard Lights Work?
If you have a yard and have ever thought about lighting it at night, then you have probably heard about solar yard lights. They are still pretty expensive, but their advantage is that you don't have to run any wiring for them. As long as a location gets direct sunlight, you can put a light there in about 15 seconds.
These lights are extremely interesting because they are almost like mini-satellites. They generate and store their own power during the day and then release it at night. This is just like a satellite that stores solar energy while it is on the sunny side of the planet and then uses that energy when it's on the dark side. In this article, you will learn exactly how it happens!
The Basics Here is a typical solar yard light:
It consists of the following components:
• A plastic case
• A solar cell on top
• A single AA Nicad battery
• A small controller board
• An LED light source
• A photoresistor to detect darkness
Now let's see how the whole setup works to light your yard at night.
Producing Light If you have read in my blog (you can find the address in the signature) How Solar Cells Work, you have a basic understanding of solar-cell technology. A solar yard light uses standard solar cells in a very straightforward application.
A single solar cell produces a maximum of 0.45 volts and a varying amount of current depending on the size of the cell and the amount of light striking the surface. In a typical yard light, therefore, you need four cells wired in series (see How Batteries Work for a discussion on series wiring). In this yard light, the four cells will produce 1.8 volts and a maximum of about 100 milliamps in full, bright sunlight.
The solar cells are wired directly to the battery through a diode (which prevents the battery's current from flowing back through the solar cell at night). The battery is a completely standard AA Nicad battery. A battery like this produces about 1.2 volts and can store a maximum of approximately 700 milliamp-hours. During the day, the battery charges, reaching maximum charge except on shorter winter days or days when there is heavy overcast.
At night, the solar cells stop producing power. The photoresistor turns on the LED. How do the streetlights turn on automatically at night? shows you a very simple circuit using a transistor and a relay to control a light using a photoresistor. In the case of this light, the relay is replaced by two other transistors.
The controller board accepts power from the solar cell and battery, as well as input from the photoresistor. It has a three-transistor circuit that turns on the LED when the photoresistor indicates darkness.
The LED draws about 45 milliamps with the battery producing about 1.23 volts (0.055 watts). It produces about half of the light that a candle would. The Nicad battery, when fully charged, can operate the LED for about 15 hours.
Half of a candle's light is not very much, and if you have ever purchased one of these yard lights you know that it really is not enough to provide illumination. You use them more for marking a trail -- they are bright enough to see, but not really bright enough to illuminate the ground to any great degree.
The reason why these lights are so expensive right now is because of the solar cells and, to a lesser degree, the Nicad battery. Solar cells remain expensive because they are manufactured from silicon crystals in cleanroom conditions. They are much less expensive than they were 10 or 20 years ago, but still fairly pricey. As a result, solar yard lights cost $10 to $20 per light.
The yard light shown here uses a single LED. More expensive lights may offer a combination of an LED and a small halogen flashlight bulb. The LED is on all the time, and the light bulb turns on for a minute or two when a motion sensor detects movement.
For more information on solar yard lights and related topics, check out my blog: www.RunGreenPower.com
RunGreenPower.com will teach you how to build solar & wind power systems for
your home within a weekend.
Check It Now: Do You Want To Build Homemade Solar Cells?
Article source: https://articlebiz.comRate article
Article comments
There are no posted comments.
Related articles
- Smart Savings: The Benefits of Buying Out of Season
- How to prepare for a house clearance, a few tips from experts
- Expert and Little Known Tips for Limestone Floor Maintenance
- Top Furniture: Discover the Best of Deutsch Design
- Spring Clean Like a Pro
- Spring into Clean: Transform Your Home with Diamond Home Support Barking
- Spring Cleaning Magic: Unveiling a Fresher Home
- Top Cleaning Tips for the Spring
- The Lemon: Nature's Remarkable Cleaning Marvel
- Why Tree Removal is Essential for Home Safety
- The Dos and Don'ts of DIY Pressure Washing: Expert Tips and Tricks
- Are Silver Travertine Tiles Better Than Other Alternatives? Know How!
- Rustic woodgrain farmhouse cottage with vintage carved barn doors
- Ultimate Guide to Versatile and Secure Storage Cabinets with Locks: A Functional and Practical Solution for Every Space
- The Ultimate Guide to Investing in a Home Lift
- holistic garden sanctuary, buddha statues
- Vintage rustic wood credenzas
- Nature carved Barn Doors
- 7 things you must know before building, extending or renovating your home.
- The Impact of Electrical Upgrades on Home Resale Value in Australia
- Rodent-Proofing Your Home: Tips and Tricks
- How Much Does House Removal Cost in Australia? Understanding Your Moving Budget
- Advantages of Using Ceramic and Porcelain Tiles at Home and Commercial Places
- Culinary Chronicles: A Journey Through Kitchen Renovations
- The Advantages of Using a Professional Cleaner in Liverpool
- Crafting Culinary Sanctuaries: The Poetic Essence of Kitchen Remodeling
- The Importance of Using Professional Tilers for Regrouting Bathroom Tiles
- Making Eco-Conscious Decisions in Home Renovations
- Advantages of Engaging Expert Home Cleaners in Bournemouth
- How To Declutter Your Home - In 5 Simple Steps