Solar Panel Output
| May 23, 2011 | Posted by admin under Solar Panels |
Solar Panel Power Output - Wattage of a Solar Panel
Author: Anton
Most simple series connected solar panels are rated into three categories :
* 15 to 16 volts - 30 to 32 cells per panel
* 16.5 to 17 volts - 33 to 34 cells per panel
* 17.5 to 21 volts - 35 to 36 cells per panel
15 to 16 volt panels are referred to as self-regulating panels because they do not produce enough voltage to overcharge batteries, which results in gassing. For this reason they do not require a charge regulator as the other panels do. This reduces the cost and maintenance of a system. These are referred to as battery maintainers, and are excellent to use in small system with one battery if the system does not have much of a power drain. Electric fences, and other low power applications that have limited energy use can use these types of solar panels.
16.5 to 17 volt panels are adequate for full fledged power systems in locations that generally get a lot of sun year round.
The preferred panel for most solar charging applications is a 35 to 36 cell panel which delivers from 17.5 to 21 volts open circuit voltage. A 36 cell panel is recommended for very hot climates in order to offset power output loss from high temperature. They also compensate for voltage drop in systems with long wire runs.
Designer watts
Designer wattage is simply the open circuit voltage multiplied by the short circuit current. Panel designers use this figure to rate the components used in the panel and peripheral components.
If a panel delivers about 20 volts open circuit and 3.5 amps short circuit current, the designer wattage would be 70 watts. The system components must be able to handle 70 watts, at 3.5 amps and 20 volts.
A panel rated at 70 designer watts will probably give you about 54 watts in real use and it will vary depending on the efficiencies of the cells as well as other conditions.
More about Green Energy and Solar Panels can be found at http://solar-panels-info.blogspot.com.
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What does solar panel output refer to?
If a solar panel is a 1.5kW system, what length of time is it putting out that much power? Every hour?
Solar panels are rated under standard test conditions (STC), a certain amount of light at a certain distance, at a certain temperature, etc. A kW, or kilo watt, is 1000 watts. So for the amount of time that the sun meets those conditions, the rate of output is 1500 watts. An average location has an average of 5 sun hours a day, the total time that you produce the rated output.
Watts is a rate, like miles per hour (mph), how fast it is going. Watt hours, or kilo watt hours (kwh) is a quantity, like miles. So if you drive 50 mph for 5 hours, you went 250 miles (50 mph x 5 hours). If you produce 1.5kw for 5 hours, you have the potential to produce 7.5kwh a day. Multiply that by 30 days in a month, you get 225kwh a month. In reality you will lose about 30% of the rated power from less than ideal weather, system losses, etc., so it’s more like 150kwh a month. You can look at your electric bill to see how many kwh you use a month, maybe around 1000kwh, and see what percentage of your usage a system like that can power.
Solar Panel Output, how does it stack with multiple panels?
If a solar panel puts out: 180 Peak Watts, 26 Peak Volts, & 7 Peak Amps- Is this per hour? And how does this translate to the layman?
watts are a rate. It produces 180 watts as long as the sun is bright enough.
Look at this way, 180 watts is enough to light a 100 watt bulb and a 80 watt bulb. If and when the sun is bright enough. More typically, it will put out 100 watts or less.
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how does the output of a solar panel vary with the angle of the light?
how does the output of a solar panel vary with the angle of the light? I need to do a experiment about it. Is anyone can help me create a experiment to test it? Thx.
By the sine of the angle. If you haven’t taken trig yet, I’ll just mention that the sine of an angle is the ration of the length of the adjacent side of a right triangle to its hypotenuse and refer you to wikipedia for more detail.
What you need to do is set up a light source such as a 100 watt light bulb perhaps about 1/2 meter over a table. Hot glue the straight sides of 2 protractors to the bottom of your solar cell. Then you can use little props like maybe a couple of erasers so that you can angle the solar cell any way you like, reading the angle indicated by the protractors where they touche the table top.
Then you need a voltmeter and a load. A good load for an average solar cell might be a 100 ohm resistor from Radio Shack. Connect the resistor across the output of the solar cell via a pair of wires, hook the voltmeter across the resistor, and take readings of the voltmeter at say every 10 degrees from 90 to 0 degrees. Make a graph.
I don’t know how sophisticated you intend to get with this, or your grade level. The above setup will give you a very basic experiment. The voltage output will increase with angle up to a peak at 90 degrees. But it is the power output of the solar cell that will be proportional to the sine of the angle of incidence, and power equals voltage times current. Email me if you want more information or have questions.
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What is the average voltage output for a solar panel?
What is the average voltage output for a solar panel? I’m speaking of the small sized ones that would go on the side of a house. Perhaps an answer given in per-area would be good.
Thanks!
Individual cells are about 1/2 volt each. How they are interconnected and how many cells there are determine the total voltage and current.
Larger ones are configured usually for 12 or 24 volts.
It’s like a bunch of 1.5 volt batteries. You can connect them all in parallel, all in series, or any of many series parallel combinations.
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How to calculate Solar Panel output?
Im looking for some direction on solar panel stats such as:
When I buy a 200 watt solar panel, does that mean it produces 200 watts per hour? day?
And any more information would be great.
A Watt is an instantaneous measurement. A watt hour is a unit of energy. A 200 Watt panel will produce about 200 Watts as long as the sun is shining. I’m not sure what your getting at here but I think you want converter Watt hours to another unit of energy such as BTU’s or joules.