PV Gap

Terry Said:

do solar panels need direct sunlight to work?

We Answered:

Solar panels use light energy (photons) from the sun to generate electricity through the photovoltaic effect

Recent solar panel designs include concentrators in which light is focused by lenses or mirrors onto an array of smaller cells
Depending on construction, photovoltaic panels can produce electricity from a range of frequencies of light. Sunlight conversion rates (solar panel efficiencies) can vary from 5-18% in commercial production, typically lower than the efficiencies of their cells in isolation
But as we knew that the solar energy is so powerful that even with this conversion rate is able to produce a large power supply
So, when direct sun light is available they produce more power but when it is cloudy they are not as efficient but power is stored through batteries and they work well but Separate diodes are needed to avoid reverse currents, in case of partial or total shading, and at night.

I hope your doubts are resolved if not please pick up a third or fourth standard book there is complete detail in those.
Thank you

Laura Said:

Does the book which Barack Hussein Obama calls the "Holy" Koran ban solar panels on the White House roof?

We Answered:

I think Obama should demand that Michelle cover up and wear only the black sheets and face veil of the women in the countries he admires in speech and deed. Please at least cover her face and her arms!

Jay Said:

Solar Panels Question?

We Answered:

You need the average Insolation in the UK ('INcoming SOLar radiATION'). This website has figures[1].

Take the London figure, roughly 2.6kWh/m^2/day. At 40% efficient solar panels, a metre squared will get 1.04kWh per day.

6.5GW average (GW means GigaWatts, which is a billion watts...) is a daily power use of:
6.5 x 24 = about 156GWh (GigaWatt hours)

Divide total demand by amount per metre-squared to get the area needed.

156000000/1.04 = 152.9 million square metres.

To get an idea, that's just over 0.06% of the UK's land area, or 7.6 square metres per UK household. We could probably theoretically fit all of that on roofs and the side of buildings.

Angela Said:

Where can i but the small solar panels which you see on such things as Garden Lights?

We Answered:

http://www.selectsolar.co.uk/cat/mini-so…