how many watts dose solar light panels put out?

Question

you know the ones from those garden solar lights i would like to know how many watts the pannel on that puts out

Answer 1

The output depends on how bright the sun is, how efficient the panels are, how big they are, and how directly they are pointed at the sun. For most of the day, the sun shines with an intensity of about 1000 watts per square meter on a surface directly facing the sun.

For a smooth photovoltaic surface where the peaks of the cell surface do not cast shadows on the valleys, you can figure on a multiplier of cos θ, where θ is the angle off straight-on between the flat surface of the cell and the sun.

Most solar panels today are about 5-30 percent efficient, with the higher efficiencies for really expensive technologies. For the kinds of cells you see on garden solar lights, you can figure about 8-15 percent efficiency.

If A is the active area of the panel in square meters, η is the sensor's efficiency, and θ is the angle of incidence of the sun with respect to the normal to the surface of the panel, then its power output is

P = 1000 W/m² * Aη cos θ

If A is a 5 x 5 cm (2 x 2 inch) square, A = 0.0025 square meters. Take η to be ten percent (0.1) and the angle of incidence θ to be 45 degrees, for which cos θ will be about 0.71. In this case, the power output will be

P = 1000 W/m² * 0.0025 m² * 0.10 * 0.71
or 0.18 watts.

Answer 2

It depends on the size and type.
Try American Science Surplus (http://www.sciplus.com/) for cheap ones. They offer one that generates 4.5VDC at 50mA. Watts = voltage X amperage so this isn't a very powerful one, less than 1/4 a watt. Remember this is DC power so a power transformer and power inverter will be needed if you want to use it to help power your house.

Solar Cells are not very efficient currently about 30%. They need to be improved and according to this month's Popular Science the problem is laying down the crystals in a regular pattern.

For more information check out this article: http://en.wikipedia.org/wiki/Solar_cell

Answer 3

The ones in a solar garden light produce little power, while there are various types on the market, I'd guess that typically it would some fraction of a watt rather than "watts" plural.

Answer 4

Panels vary in size and capacity. Most residential units are about 80-120 W. per panel. ( Don't count on this output for more than 3-4 Hr.s per day on average).

Answer 5

1

Answer 6

You can now purchase solar panels in almost any voltage and wattage, so you need the manufacturer and model number to look up output for the ones you have in mind. If you have access to the data plate, you should be able to read this info off the data plate.

Answer 7

High Performance Tactical Flashlight - http://FlashLight.uzaev.com/?QXcR

Answer 8

It depends on the power you need.

Answer 9

Do you mean"does", instead of "dose"