I would like to know from where I can buy a suitable solar cell(panel) which can provide a few watts of power to run a fan and a light.May be directly run a fan at day time.And do some small lighting of about 10 watts for 4 to 6 hours at night.
you can get it from any hardware store
The reason is that…
(a) relative to their stars, planets are brighter in the infrared than in visible light.
(b) the longer the wavelength used, the better the angular resolution of a telescope with a fixed aperture size.
(c) because of the properties of their atmospheres, planets reflect more infrared light than visible light.
Stars give off most of their energy as visible light, whereas planets emit most of their energy in the infrared region of the spectrum. Therefore, relative to their stars, planets are brighter in the infrared than in visible light and so the correct answer is (a).
The reason is that…
(a) relative to their stars, planets are brighter in the infrared than in visible light.
(b) the longer the wavelength used, the better the angular resolution of a telescope with a fixed aperture size.
(c) because of the properties of their atmospheres, planets reflect more infrared light than visible light.
Stars give off most of their energy as visible light, whereas planets emit most of their energy in the infrared region of the spectrum. Therefore, relative to their stars, planets are brighter in the infrared than in visible light and so the correct answer is (a).
so my friend and i are entering a contest for our school. the project is to long to describe so ill just get to the question. i need to power 20 4mm blue led lights. and it need to be done by solar panels. it doesn’t have to run for vary long at night, but it has to be lit during the day. dose anyone know how i would go about doing this. i know a descent about about electronics so don’t feel like you have to dumb anyhting down..
yes but what size regulator, what size/kind of battery. maybe i should not say i know a descent amount, i know how to assemble things once i know what i need
If you know electronics what do you need to know? This is about as basic as it comes. Panel needs to go to a regulator, regulator needs to go to a battery, the battery needs to go to the leds.
You should be able to get every part you need from radioshack.
20 leds at 20ma at 3.5 volts is 1.4 watts of power. Make sure the panel is rate for about twice this size.
*****
Your setup depend a lot on how efficient and how much money you want to spend.
Best setup would be to buy a 2 watt panel then connect it to a Adjustable-Voltage Regulator like a LM317T (radioshack) this regulator supports over 1.5 amps(5.25w)this will easily power 1 watt of leds. Setup the regulator to output 3.5 volts. If you dont care if it runs at night connect the small power capacitor rate for more than 3 volts. If you want it to run for a little longer at night connect it to a larger capacitor. If you want it to run for a long time connect it to 3.5 volt worth of rechargeable batteries.
easier and less efficient way would be connect the panel to a preset voltage regulator like a 5volt connect this to your power source that you pick. Then put a resistor on every led so they can run off the 5volts.
If you led is 3.5 volt and needs 20ma you would need a 250 ohm resistor on every led. (5v/0.02amp=250ohm)
Easist and not the best would be to buy 12volt solar battery charger. Connect the charger to a motor cycle battery. Connect 600 ohm resistor on every led and your done.
Just make sure the panel doesn’t output voltage higher than you regulator supports. This shouldn’t be a problem with small panels.You could all so skip using resistor on every led and hook some or all of them in series but its not as easy.
so my friend and i are entering a contest for our school. the project is to long to describe so ill just get to the question. i need to power 20 4mm blue led lights. and it need to be done by solar panels. it doesn’t have to run for vary long at night, but it has to be lit during the day. dose anyone know how i would go about doing this. i know a descent about about electronics so don’t feel like you have to dumb anyhting down..
yes but what size regulator, what size/kind of battery. maybe i should not say i know a descent amount, i know how to assemble things once i know what i need
If you know electronics what do you need to know? This is about as basic as it comes. Panel needs to go to a regulator, regulator needs to go to a battery, the battery needs to go to the leds.
You should be able to get every part you need from radioshack.
20 leds at 20ma at 3.5 volts is 1.4 watts of power. Make sure the panel is rate for about twice this size.
*****
Your setup depend a lot on how efficient and how much money you want to spend.
Best setup would be to buy a 2 watt panel then connect it to a Adjustable-Voltage Regulator like a LM317T (radioshack) this regulator supports over 1.5 amps(5.25w)this will easily power 1 watt of leds. Setup the regulator to output 3.5 volts. If you dont care if it runs at night connect the small power capacitor rate for more than 3 volts. If you want it to run for a little longer at night connect it to a larger capacitor. If you want it to run for a long time connect it to 3.5 volt worth of rechargeable batteries.
easier and less efficient way would be connect the panel to a preset voltage regulator like a 5volt connect this to your power source that you pick. Then put a resistor on every led so they can run off the 5volts.
If you led is 3.5 volt and needs 20ma you would need a 250 ohm resistor on every led. (5v/0.02amp=250ohm)
Easist and not the best would be to buy 12volt solar battery charger. Connect the charger to a motor cycle battery. Connect 600 ohm resistor on every led and your done.
Just make sure the panel doesn’t output voltage higher than you regulator supports. This shouldn’t be a problem with small panels.You could all so skip using resistor on every led and hook some or all of them in series but its not as easy.
I’m trying to find a part for one of my solar lights and I can’t find their website.
There’s a Wiki about Noma lights here:
http://en.wikipedia.org/wiki/NOMA_(company)
Hmmm. That won’t help because the original Noma company went bankrupt in 1967…
Two separate Noma companies in the UK are:
http://www.nomadirect.co.uk/nd/index.aspx
and
http://www.noma.co.uk/n/index.html
If you’re in Canada, Canadian Tire and possibly Home Hardware carries them.
We have some Noma Moonray lights here where I live and, quite frankly, these aren’t really designed to be repaired all that easily. Just replaced.
And I had a Noma extension cord that shorted out the first time I plugged a power tool in it. I was 40 miles away from a hardware store at the time, but managed to do a work-around and get the job done, but you can understand why I’m not likely to buy Noma products.
I’m trying to find a part for one of my solar lights and I can’t find their website.
There’s a Wiki about Noma lights here:
http://en.wikipedia.org/wiki/NOMA_(company)
Hmmm. That won’t help because the original Noma company went bankrupt in 1967…
Two separate Noma companies in the UK are:
http://www.nomadirect.co.uk/nd/index.aspx
and
http://www.noma.co.uk/n/index.html
If you’re in Canada, Canadian Tire and possibly Home Hardware carries them.
We have some Noma Moonray lights here where I live and, quite frankly, these aren’t really designed to be repaired all that easily. Just replaced.
And I had a Noma extension cord that shorted out the first time I plugged a power tool in it. I was 40 miles away from a hardware store at the time, but managed to do a work-around and get the job done, but you can understand why I’m not likely to buy Noma products.
Easy one you just take the distance of the newly discovered planet (Xena, also called Sedna) and divide it by the speed of light.
That is 8400 million km divided by 300000 km/sec and that
= 84000/3
= 28000 seconds
If you want it in minutes then,
= 28000/60
= 2800/6
= 466 minutes and 40 seconds
Earth takes only 8.5 minutes to recieve the rays.
Hello, I want to have some light on my shed.
I was thinking on solar lighting. I have a 8xAA rechargeable battery from a toy car and I’m going to buy a solar panel, what kind do I need?
Do I need something else? What is a "solar panel controller"?
How I connect everything? What kind of bulbs are better?
Lots of questions! Thanks for your help!
Stephanie.
Hello, I want to have some light on my shed.
I was thinking on solar lighting. I have a 8xAA rechargeable battery from a toy car and I’m going to buy a solar panel, what kind do I need?
Do I need something else? What is a "solar panel controller"?
How I connect everything? What kind of bulbs are better?
Lots of questions! Thanks for your help!
Stephanie.
PS. I WANT to build it, I know there are very cheap ones out there, but the objective is to learn a bit of electricity (positives and negatives and all that).
You need a panel, 5W is maybe fine, possibly 10W. 12V nominal.
You need a charge controller to prevent the batteries from overcharging.
You should use LED lighting.
I would prefer a Sealed Lead Acid cell.
It won’t be very cheap.
Strong box with cameras with nightvision mounted on them for 360 degree views wireless transmissions of video signals in powered by batteries and a solar panels placed on poles or on the tops of buildings to moniter firstly those roads that have the most IEDs planted in them and working down the list in order to detect them before they harm or kill troops and civilians. Wouldn’t this also be vastly more affordible then almost all the other things tried so far and help troops make up for lack of numbers in order to better secure areas? And after US troops went home they would help the government’s of these war torn countries stay afloat better and help them make up for areas they’re lacking in. I know it sounds intrusive but streets and intersections all over america already have cameras to look for people running red lights and who knows what else and we’re not even in combat zones(which I think should be stopped). Wouldn’t this make IEDs virtually obsolete and help our allies?
Not a bad idea, but very expensive to implement. Then you have to ask how to keep the bad guys from monitoring the cameras? How do you get the bad guys to not just operate outside the range of the cameras? How do you keep the locals from stealing them? Who mans the monitors? Is it better than cameras mounted on drones?
