The Solar Cells

Debra Said:

How many solar cells would I need to charge and run my laptop at he same time.?

We Answered:

well that might get expensive. see you have solar power, which is direct current (dc) power that needs to be converted into alternating current (ac) power then back to dc power. so you will have to have power inverters and monitors and all that stuff or you will fry both of them. You know they make laptop bags now with flexible solar cells to charge your stuff without all that power loss and expensive equipment. the cord extends out from bag so you can charge it while using it. And you get it with the power rating it needs. That might be a better idea than spending a few hundred dollars on your idea.

Derek Said:

What are the environmental factors when using solar cells as an energy source ?

We Answered:

You don’t have to use special water to clean rooftop solar panels. You can just hose them down.
Other than what was already said (temperature, pollution), weather of course. Solar cells are only 50% of their full capacity when it is cloudy.
And of course the obvious – time of day. They don’t work at night. None whatsoever. Solar energy is clean, infinite, and renewable. The only downside to solar energy is that it is expensive. In time, I believe that it will become more cost-effective.

I came accross a new, proven and tested home made wind power system and solar power system which eliminates our electricity bills. It was written by a Renewable energy enthusiasts Michael Harvey the diy called Earth4energy. You can get your copy to save energy and help environment while eliminating your power bills. Get it from here: http://homemadeenergyreviews.blogspot.com/

Sonia Said:

What are the environmental impacts of solar cells?

We Answered:

The waste in manufacturing the panels are one, but one thing everyone is missing is this:

To deploy solar power, you need UNOBSTRUCTED view of the sun over its annual sweep. This means you need to have NOTHING between the panels and the sun the panels, EVER.

Although you can get landscapers to plan this out for you, this is a cost that is not taken into account, which can amount to a lot of cash.

I have a “green” neighbor who jumped into getting panels on their house, but the installers saw the trees and basically stripped the branches off of five “old growth” cherry and maple trees. I would say there was a pretty hefty environmental impact there. They wouldn’t chop them down because of town ordinances, but they look really ugly and the neighbor is still hurting from the experience.

That is why solar farms are not as popular – they create shade when installed and require that full access to the sky to have maximum benefit.

If you set them in the city, all the buildings/skylines need to be adjusted to not create shadows over any arrays. Not easy to accomplish – as we have no “solar rights” laws yet.

Rural areas/farming fertile areas would be a decision of solar power for food or electricity. Not an easy decision.

Hope that helps.

Charlene Said:

What would happen if two or more solar cells having different potentials are connected in parallel?

We Answered:

For the solar cell with the lower voltage, it will have electric current flowing in the opposite direction, thus adding energy in the solar cell.

Because all voltage sources have internal resistance, this will really manifest as the internal resistances heating up.

Nathaniel Said:

What is the term for the solar cells we see on calculators and satellites?

We Answered:

“solar cells”

Gail Said:

What range of light frequencies do solar cells produce current at?

We Answered:

For first generation solar cells they produce current at the sunlight wavelengths. See graph from the link. You can probably find a current vrs. frequency plot somewhere but certain things have to be fixed for this to occur such as the incidence angle of the light and the exact type of cell. Normally you see plots of quantum efficiency. I got you started. Interesting science.