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Solar Panel Output

... the combiner box dave wiring solar panel output wires to combiner box

How to Calculate the Output of Solar Panel

A single photovoltaic module is responsible in converting the sunlight into a DC electrical power. Working on this method, the developers have designed improved panels containing several amount of photovoltaic cells to meet the industrial and household needs of today. Many electronics installed in the house are better to run on solar panel, so that it will control the expenses we have to accumulate in the form of electrical bills.

But one can set up effective solar panels if they could identify the value of output that a solar panel will be able to produce. In order to be able to understand the output levels of any solar panel one have to understand on a few things. First being that heat trapped in the cells is shifted into a DC electrical power, which is a product of current (I) and voltage (V) and measured in Watts (W). The power released by the solar panel is directly influenced by the electrical load resistance linked to the panels. This resistance is measured in the unit of Ohm and can be calculated according to Ohm's Law, which includes dividing voltage by resistance to get the estimation of the current.

To measure out the output value, it is actually linked to multiple values of resistors which can measure the voltage produced value, thus can be used to obtain the best power output value for any panel overall. A digital multi-meter that reads the DC can also be used for finding the output value. One can determine the output levels of a solar panel by reading the voltage calculated with the help of the meter when it is connected to the resistor.

The digital multi-meter can also be used to measure the open and short circuit voltages and calculate each current by dividing the measured voltage from the resistance value. Power then can be verified by multiplying the voltage with the current as mentioned in the formulae given earlier.

One of the most well known attributes of all the solar panels is that they produce highest level of power when the resistance measures 25 Ohm and power to 81 watts. The optimum point for a solar panel is described when the voltage and the current are produced at their fullest. When testing the solar panel output, try not to use 1/4 or 1/2 watt resistors as they are prone to getting over heated and thus, burn. Use the rheostats instead, or high watts resistors for helping in deciding the accurate measurements quick.

Once you have determined the solar panel output, you can opt for better options according to the house and family requirements.

About the author: If you are looking for more resources on solar panel, you can go to howtosolarpanel.com. There you will discover many useful information regarding solar energy for example free solar energy and much more.

Source: http://www.articlesbase.com/technology-articles/how-to-calculate-the-output-of-solar-panel-1576493.html

Frequently Asked Questions

  1. QUESTION:
    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?

    • ANSWER:
      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.

  2. QUESTION:
    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.

    • ANSWER:
      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.

  3. QUESTION:
    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?

    • ANSWER:
      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.

      .

  4. QUESTION:
    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!

    • ANSWER:
      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.

      .

  5. QUESTION:
    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.

    • ANSWER:
      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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