The solar panel placement idea?
Hi, I have been trying to go green, I have to buy some solar panels that are about 45watts I have been putting against my window and can get power out of it enough for my lights and a pair of low-watt gadget (cell phone, 12v light, portable dvd) for a couple of hours. However, its seems to drain faster than I can 12v charging Am I getting more power from my panel? Or should I put on the roof? I am in Texas and gets hot and sunny the beam of sun my living room windows very well for 4 pm-6 pm.
was going to be much better. You can not tell, but the glass is opaque to actully many ranges of "light." If you look in the windows advertising you may see Sun aims to reduce fading of your carpet / furniture. This is because the blocks UV glass. Solar panels get some of their energy from UV light. Also, some windows are designed to block infrared to help better insulate when house is cooler than the outside. Again, the solar panels get some of their energy from light in the infrared range. And finally if you are the burden of batteries "time out corner" remains important. The amount of light absorbed is very closely related to the cosine of the angle that the sun is "off" to direct. so when the sun is 45 degrees off perpendicular to the panels still get cos45 =. 707 or about 70% of available energy. (In practice is somewhat less than that, because the energy reaching the panel to be absorbed as at noon). But anyway, you can calculate two hours of the morning or sun the afternoon will give you more energy than 1 hour of the midday sun. So if the panel is inside, you lose that energy available.
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