GreenLetters

greenletters — Mon, 26 Oct 2009 10:03:13 +0000

Imagine the possibilities – look at this Solar Stirling Engine !

Although this video is just one among dozens of home made sterling engines, it must be noted that it is also the cheapest ‘working’ engine you might ever come across.Larger more complex sterling engines obviously cost a lot and are yet to join the mainstream.

While some estimates put the conversion efficiency of ‘Solar input to Mechanical output’ to be between 8-10 %, great deal of emphasis is being given on designing more efficient conversion mechanisms. It would be reasonable to assume that Sterling power engines could potentially satisfy mechanical power requirements for applications like water pumping, Air compression etc in areas where generators are the only other option available.

Watch the video and leave your comments for discussions here.

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Video Playlists

greenletters — Mon, 20 Jul 2009 19:38:33 +0000

REnew – Newest Innovations

Witness the hottest innovations from around the world. See the latest Renewable Energy products and applications as they are being developed by maverick inventors, renowned scientists/engineers and enthusiasts alike…And then some from a ‘regular’ bloke from across the street!

WindCraft

Ever wondered how a wind mill makes electricity out of thin air ? well .. here are some of the finest videos which show exactly how these magnificent machines work. You might just see one sometime soon … at a location near you!

SunBurn

Some of the most insightful and interesting videos on Solar energy that you might come across !

DIY Tutorials

Learn how to make your own Renewable energy power systems using locally (and cheaply!) available materials.Solar Photo voltaic (PV) applications, small residential wind electricity generators (WEGs), micro hydro packs for off-grid generation….. most importantly, you don’t have to be a rocket scientist to get started !!

This page is updated on a daily basis, so do come back for more! Also, Click here for more of our videos on Youtube.

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REnew – Newest Innovations

greenletters — Mon, 20 Jul 2009 19:34:02 +0000

Witness the hottest innovations from around the world. See the latest Renewable Energy products and applications as they are being developed by maverick inventors, renowned scientists/engineers and enthusiasts alike…And then some from a ‘regular’ bloke from across the street!

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A practical and design efficient Helix Wind turbine

greenletters — Mon, 20 Jul 2009 13:53:36 +0000

Helix Wind Turbine

This is a turbine design worthy of a closer look . Notice the wafer thin blade material, the low drag bends and the conch shape compactness of the design. More updates on their commercial availability on Greendevices. Their website
Watch More videos on our youtube channel

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Green D-I-Y Tutorials

greenletters — Wed, 31 Dec 2008 00:28:22 +0000

learn how to make your own Renewable energy power systems using locally (and cheaply!) available materials……. most importantly, you don’t have to be a rocket scientist to get started !!

This page is updated on a daily basis, so do come back for more! Also, Click here for more of our videos on Youtube.

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WindCraft

greenletters — Tue, 30 Dec 2008 21:40:58 +0000

This page is updated on a daily basis, so do come back for more! Also, Click here for more of our videos on Youtube.

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SunBurn

greenletters — Tue, 30 Dec 2008 20:32:31 +0000

This page is updated on a daily basis, so do come back for more! Also, Click here for more of our videos on Youtube.

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All Charged – but Nowhere to go ? – Part 1

greenletters — Mon, 29 Dec 2008 21:11:58 +0000

We recently heard the buzz here that consumer battery superweight Energizer would be launching a portable Solar Powered AA and AAA battery charger at the 2009 International Consumer Electronics Fair(CES) this January.

At first look there is little doubt that the device is neatly designed, compact and provides for easy rotation of the solar panel towards source of direct or reflected sunlight , but a quick estimate of the solar-cell surface area and power production estimate based on prevalilng Solar efficiency and conversion levels brings the enthusiasm crashing to just about knee height. The question that come to mind is – ‘Will this unit deliver?’

It may be a bit too early to get a specific answer about the Energizer’s particular product but not too difficult to see where it could go with all the technology available today. In this multi-part post we examin some Portable Solar Powered Charging devices and try to see how practical they can be in day-to-day use.Read on ..

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