12v 10w solar panel and 5w computer case fan, will it burnout?
It’s a very simple question but one I need a precise answer to and google isn’t helping much. If I have a solar panel with an output of 10w at 12v and I connect it directly to a computer case fan that needs only 5w at 12v will the fan burn out or does the wattage even matter? Or does the Voltage matter?
What if the power source provides less wattage than the fan needs?
What if the power source provides less wattage than the fan needs?
Hey Ryudai, that 10 watt panel will run the fan just fine. What will happen over time is the fan will eventually fail, the reason is the power output from the panel will be “unregulated” if you connect it straight to the fan. So as the sun comes up higher, the output voltage for the panel will attempt to reach all the way to its open circuit voltage, which is almost always around 17 or 18 VDC for a 12 volt nominal panel. The fan will end up eating a bit more volts and milliamps than it was designed for. Then as the sun goes down, the voltage will degrade with it, and the fan will run slowly, too slow at least for a while to provide for its own cooling needs.
Real Goods Catalogs actually had sets like this for sale for a while. Lately I’ve only see the ones for pond aerator pumps. They were actually bilge pumps for a boat, with a solar panel included that was rated for about 130% of the wattae requirements for the pump. The catalog said the pump usually last 1 to 2 years and then burn out, but are easily and inexpensively replaced at a boating supply store for less than $20 USD. That type of computer fan is also very inexpensive and easy to find, I would try Marlin Jones website below for a selection of them.
There are installations at commercial buildings that have fans powered by larger panels, and they use a regulator inbetween them. The regulators alone cost more than maybe a dozen replacement computer fans, so it doesn’t make much sense to consider one in this small application. We have two unregulated solar charging kits in our outbuildings, but the panels are 50 to 120 watts each, and they are driving into a set of 220 amp hour golf cart batteries, which are absorbing all the extra energy over time. You could consider this if you want the fan to work anytime, not just when the sun is shining. I’d use a 12 volt 9.5 Amphour sport battery from someplace like Gander Mountain or Cabelas. They cost around $15 or $20, but could easily take what the panel is putting out any day, and provide your little fan with over 24 hours of non stop run time if needed. Just hook the battery and panel in parallel to each other, then put a switch in the line between the battery and the fan. Take care, Rudydoo
Solar panels and Photocells, Help?
i’ve looking for sources to help me research, this but i can’t seem to find anything useful.
so if you know of any sources that would be great…
I need to find out:
1.how they work
2.what factor effect where solar panels are placed
3. how the power output of solar panels fitted to a house can change
WORKING OF SOLAR CELLS OR PANELS:
Photovoltaic (PV) cells – photocells
Solar cells do not utilise chemical reactions to produce electric power. They convert sunlight energy into electric current. They do not store energy.
The cell voltage is proportional to the amount of sunlight falling on the cell but is generally less than 0.5 Volts.
The sun’s energy reaching the surface of the earth is roughly 1 kilowatt per square metre.
Solar cell conversion efficiencies have improved in recent years to between 20% and 30% but they still only generate 150 W/m2 in bright sunlight. A reasonable maximum size of a solar array in a typical car would be 3 m2. In the best case, in bright sunlight, this would generate only 0.5 kW (less than 1 bhp) of power which is not enough to drive a road vehicle or even to charge a reasonable sized battery.
Taking into account the hours when there is no sun, or hazy conditions and that the solar cell would often be shielded or tilted at an angle to the sun, the average power generated by the array would be less than 30 W/m2 even in a sunny climate. This makes solar power impractical for driving any other than specialist low power demonstration vehicles.
Cells convert sunlight energy into electric current they do not store energy. Sunlight is the “fuel”
Batteries: Typically about 12 deep-cycle lead acid batteries
Charge controller: To regulate the charging of the batteries
Inverter to convert the low voltage DC power from the batteries into AC mains power for use by appliances
Inexhaustible energy source
PV manufacturers guarantee their products for up to 20 years.
Depends on sun
Typically, the output of any industrial PV module is reduced to 5-20% of its full sun output when it operates under cloudy conditions.
Low cell voltage 0.70. Grade B cells have a fill factor usually between 0.4 to 0.7. The fill factor is, besides efficiency, one of the most significant parameters for the energy yield of a photovoltaic cell. Cells with a high fill factor have a low equivalent series resistance and a high equivalent shunt resistance, so less of the current produced by light is dissipated in internal losses.
Single p-n junction crystalline silicon devices are now approaching the theoretical limiting efficiency of 37.7%, noted as the Shockley–Queisser limit in 1961. However multiple layer solar cells have a theoretical limit of 86%.
which wavelength of light is needed to produce solar energy?
i want to make an indicator which can tell the amount of usable solar energy falling on an area at a certain point of time
Hey King, there are two types of solar collectors in the world, the solar thermal, which is used to heat water, air, or some other liquid. These types use all incoming wavelengths, they can each heat up, or ”excite,” materials they strike. The other type is the solar electric, or, “photovoltiac,” panel. These are the flat space age looking panels that turn the sun directly into electricity. They are made using two different silicone wafers that are glued together with an electrical conducting epoxy glue. In this case, it is the photons, which are incoming solar particles, that strike the silicone sandwhich, and cause a reaction that forces the free electrons from one layer onto the other. This causes a voltage to be generated across the two wafers, and by lacing small wires into the wafers, we can wick off those electrons and use them to charge a battery, or operate small DC devices. Each pair of wafers generate 1/2 volt, so by stringing 36 of them together into one panel, we can generate 18 volts, which is more than enough to charge 12 volt batteries and overcome charger controller circuitry. If you look closely at any solar electric panel today, in most cases, you can physically see the individual cells, and in most cases, there are 36 of them.
There is a device called a, “Solar Pathfinder,” that is designed to measure available solar power, or, “Solar Insolation,” as it is refered to in scientific terms. If you want to make your own, the best way is to simply use a small solar cell connected to a small miliammeter. You can find either one in lots of online order houses, or maybe even at radio shack. One of my favorite places for electronic hobby gear is Marlin P Jones, the link is below. If you can find a cell that puts out maybe one amp, then find a 0 – 1 ammeter, you should have all you need to make your own pathfinder. The real beautty of this is that you are measuring solar power available with the same technology as a panel uses to convert it to electricity. Any anomalies, like edge of cloud effect, solar flares, haze and so on that might affect the output of a panel, will affect the output of your measuring device equally, so there would be no need to make any conversions. If your homegrown pathfinder is sized to put out 1 amp in direct sun, and you are actually getting 1/2 amp on a hazy day, then you’ll know that a large array, maybe one measuring up to 40 amps, would be putting out 20 amps on the same day, very useful and accurate information. You might also learn of the temperature coefficient this way. Solar panels today actually produce more power than they are designed for in colder temperatures, exactly opposite to how one might think of them. This is why manufacturers warn people to upgrade the panel wiring in cold climates. A 5 amp panel can easily produce 8 amps in sub zero temperatures, if the panel is clean, and it is sunny out. Your little pathfinder would do the same thing.
There are some good websites to check out to learn more, and one really great magazine on this stuff, called Home Power Magazine. I’ll put the links below. Another thing you can do is click on my Avatar, and look at other questions I’ve answered over the years, you might find something interesting to read about. Good luck King, and take care, Rudydoo
Advantages of solar power during industrial revolution?
I don’t think there were any so if u guys could just come up with logical advantages during that time period that would be fine but if there are some just say so
The advantages of solar power during the industrial revolution were pretty much the same as they are today – it’s a clean, carbon-neutral source of power, and it comes for free. But the value placed on those advantages would have been less – environmentalism wasn’t a big deal, we didn’t have any idea about global warming, and other power sources like coal were also inexpensive.
There were also a number of disadvantages, some of which we still have, and some of which we’ve addressed. For one, we didn’t have the technology to produce photovoltaic cells (i.e. Solar panels) on anything like the scale required. That didn’t happen until the mid 1950s. (Of course there are other things you can do, like use solar power to heat water to drive a steam turbine, which would have been possible). For another, solar power doesn’t work at night, or when it’s cloudy, and the amount of power is reduced at higher latitudes (such as in England and the northeastern US, which were at the heart of the industrial revolution). So you need storage capabilities and transmission capabilities, which again didn’t exist at the scale required. A third problem is that the industrial revolution (well, the 1st industrial revolution, anyway) was very much a mechanical (as opposed to electrical) revolution. Electric motors weren’t developed until the 1830s (at the end of the period identified as the industrial revolution), and weren’t really practical until the 1880s (ushering in the 2nd industrial revolution). So, again, we’re looking at a solar powered steam engine rather than a solar cell like we usually think of today.
Finally, there’s the issue of energy density. Let’s say you wanted to use solar power to boil water to drive a steam engine locomotive. A typical steam locomotive will use a firebox with a cross-sectional area of about 4 square meters, which would generate 7000 horsepower, or about 5 megawatts. How much area do you need to collect sunlight to get that same level of power?
Well, the maximum amount of solar energy we can get, with a collector exactly perpendicular to the rays of the sun, is about 1.35 kilowatts per square meter. So, you’d need 5 million / 1350 = 3700 square meters of solar collecting area to power a steam locomotive with solar energy, in the best case scenario! That’s just not practical for a train which is generating power on the go.
But note that pretty much all the power used during the industrial revolution, whether it was fossil fuels like coal, gas, and oil, living matter like wood, hydroelectric power (like a dam or water wheel), or wind power, is ALL solar power anyway! The sun provided the energy for the ancient plants which fed the ancient animals, which became fossil fuels; the sun provided the energy for the trees that were cut down for wood; the sun provided the energy to the atmosphere that evaporated water and carried to the top of a mountain to run down and power a water wheel; the sun provided the energy that heated the atmosphere and created wind!
I hope that helps!
Solar energy questions?
1- What is solar power?
2- how does this technology work?
3- what is the cost of this technology?
4- are there any hidden environmental and social costs?
5- is this technology widely excepted today?
Thank you in advance to whoever answers any of these questions 10 points to best answer.
1) Solar power is energy from the sun. Passive solar energy is using the heat from the sun to do things like provide light (open windows) and heat (solar pool blankets, solar water heaters). Active solar energy utilized the waves from the sun to make electrons move thus creating electricity.
2) See the link below for videos of how it works.
3)It is expensive. To run an alternative fuel generating station, a level like that which supplies your electricity) costs more that fossil fuel stations. Homes which install solar panels can actually save money on their electricity but that comes over years…in some cases 20 yrs.
4)Environmental issues are the energy utilized in making the photovoltaic cells and the chemical emissions created from the process. Social issues are the impact of the location of massive solar arrays. (One are in NV was told they could not put an array out because of impacts to a nearby military facility)
5)Widely accepted and encouraged worldwide. This is why there are tax incentives out to encourage purchase and installation of solar.
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