Petr and Vera

PS: Don’t forget to turn on your speakers

There are several options you have.

Option 1 - buying new lights with standard bulbs

• Pros - cheaper to buy, warm light
• Cons - high energy consumption (your electricity bill will be higher, more CO2, SO2, NOx, etc. emissions), risk of fire if near the fabric, you probably end up buying new lights next year because they brake more often (more rubbish in landfills)

Option 2 - buying LED lights

• Pros - they consume only 10% of electricity and live 10 times longer compared to standard lights, no risk of fire if near fabrics or burns if accidentally touched
• Cons - more expensive to buy (but they save on electricity), colder light

Option 3 - not buying new lights at all

• You’ll save on the electricity bill and you’ll cause no damage to the environment, but we would not recommend this option especially if you have kids

As you can see there is no option with no cons, but some have more cons than others

PS: We’ve chosen an option 2 because we want light, no heat (95% of energy in standard bulb is emitted as heat) and we don’t want to buy new lights every second year.

It is estimated that each year in the USA

• 57 million birds die in collisions with vehicles
• 1.25 million in collisions with tall structures (towers, stacks, buildings)
• more than 97.5 million in collisions with plate glass
• 4 million to 10 million night-migrating songbirds in collisions with telecommunications towers
• household cats in the U.S. are estimated to kill 100 million birds each year

In comparison each wind turbine kills 0 - 2 birds per year at worst.

Global Wind Energy Council (GWEC) figures show that total installed wind energy capacity in 2006 was 74,223 MW

Let’s say that every wind turbine has a capacity of 100kW (usually they have more - even over 1500kW), it gives us around 742,230 wind turbines worldwide.

Let’s count with the worst scenario - 2 killed birds per turbine per year

Wind turbines kill 1,484,460 birds worldwide annually

Let’s have a look at the list above again and bear in mind that those numbers are only from the USA.

Source:
AWEA, 2002
Renewable energy, Godfrey Boyle, 2004
Wikipedia

First, you should decide how powerful panel you need. Let’s say that you need to power 100W appliance. If you buy a 100W panel will it really deliver 100W? Actually, it’s a bit more complicated. Solar radiation varies from place to place, fluctuate under different weather conditions, etc.

It was necessary to create a standard how to label photovoltaic panels and it was agreed that their output will be measured under these conditions:

• power density (amount of solar radiation) of 1000W per square meter
• temperature of the module or the cell is 25 °C

How can you find out how much solar radiation your area receive? There are maps which will show the average annual solar radiation. Below is a map of Europe.

From the map you can easily find out the 100W panel will produce around 200W in the South of Spain but only around 60W in the Iceland if the panel is facing South and is under the right angle.

Also check how efficient the solar panels are because some panels are more efficient than others. They could vary from around 10% to 20% so you would need twice as big surface of 10%-efficient panels than you would need with 20%-efficient panels. It means that the cheaper 10%-efficient panels could cost more in comparison with delivered power.

Solar collectors (or solar thermal panels) as mention above are used to heat water. Basically it’s a area where water flows on the flat plate or in tubes and solar radiation is used to heat up the water. There is a layer of insulation and often a black absorber plate to make sure that the most of radiation is used. When the water is heated then it’s stored in boiler for further use.

Solar collectors could supply you very large amount of your annual heating needs for a very interesting price.

Photovoltaic panels on the other hand converts solar radiation directly to electricity. The technology is more advanced and materials are more expensive.

A single crystalline silicon PV cell typically produces a voltage of about 0.5V at a current of up to around 3A which is a peak power of about 1.5 W. So to cover your electricity needs you would need a lot of cells.

Photovoltaic is a very interesting topic to which we will return many times in the future.

Tip: Change all your light bulbs to energy saving ones.

No matter if you use CFLs or try LEDs, both will consume much less energy than incandescent light bulbs. Also note that incandescent light bulbs will be probably banned soon (at least in EU and Australia).

We also don’t want to hear excuses that you cannot afford buy them because they are expensive. Detailed calculation on our eco forum tells completely something different, just have a look.

Some might complain that CFLs contain mercury which is also harmful to the environment, that is true and you’ll need to recycle old CFLs properly. But mercury emitted from power plants during generating electricity to feed your incandescent light bulbs could be even higher as you can see from the diagram below.

There are various shapes of CFL light bulbs including candle light shapes so nobody can complain that there isn’t their type available. Also various light colours can be purchased. So just choose which colour you like the most.

Many people asked us if they can somehow help us, not by making a donation because they’re still at school or college or because it’s them who could use some spare cash. It doesn’t matter if you have millions or not, your help is warmly welcome.
“I will be happy to help as I am impressed with the idea.” ~ andy hamilton

Tell about us to your colleagues, friends and family. If more people know about what we’re doing, more people will start to think about their own ways of living and maybe they realize that living responsibly is important because it will be their children who will have to live in the world their parents left them.

If you want to, just copy any green text below and use it in your emails, on forums you’re a member of or use it on your websites, etc. Feel free to alter or translate the text to your own language.

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There probably will be some more adjustments on the blog design, so if you have any suggestions, please leave a comment on our eco forum

Thank you

On our fifth anniversary we’ve told our parents. It was the time when they met for the first time. They were so surprised.