increasing solar panel current

Discussion in 'General Electronics Chat' started by aew2020, Mar 17, 2009.

  1. aew2020

    Thread Starter New Member

    Mar 17, 2009
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    Hi... I was wondering if it is possible to increase the current output of a 100 watt 24.3v panel from 3.8 amps with a transformer or other type of amplifier.

    any help would be greatly appreciated.
     
  2. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    Power = Voltage * Current

    100W is all you can get without adding more panels in parallel for more current, or series for more voltage at the same current.

    Transfomers only work with AC, solar panels provide DC. There are switching regulators that would give you a lower voltage at a higher current, but efficency issues arise, so when all is said and done, the total power output could be below 80W, with the 100W input.
     
  3. aew2020

    Thread Starter New Member

    Mar 17, 2009
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    Thank you thatoneguy for the insight, I am willing to sacrifice some efficiency for the gained current if the current is steady (given that the source or sun is steady). Would the regulator you are talking about be something I could buy somewhere. I build the panels and I am just tinkering with new ideas to increase the power if possible.
     
  4. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    There are several solar charge controllers that will do voltage level switching combined with automatic charge maintenance of deep cycle batteries. If you are building the panels from scratch, you can wire them for any output at the start. Each cell puts out roughly 2V at a low current. A large number are then wired in series and parallel to make a panel that has a voltage around multiple of 2, with the total power decided by the number of cells.
     
  5. aew2020

    Thread Starter New Member

    Mar 17, 2009
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    Thanks again... Well the cells I use are .55v and 3.6 amps at no load other than the multimeter and the way I connect them is neg to pos through the entire circuit of 44 cells and the output in full sun is 23.6 v and 3.89 amps through a 6 amp blocking diode. This is how Ive always done this but if there is a better way for more amperage output please let me know. It seems to be hard to get info on this.
     
  6. Externet

    AAC Fanatic!

    Nov 29, 2005
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    As explained above, increasing the current will take some toll from the converter circuitry.
    What is your desired current capability at what voltage ?

    Try a mirror or two, to project two or three suns onto the panel, and watch its fuse.

    Mirrors at 45° can help ---> \_/


    Miguel
     
  7. mostafa ahmed

    Member

    Mar 9, 2007
    15
    0
    Dear all,
    I think you can use buck converter.
    I you use buck converter you can increase current but you will decrease output voltage and the main advantage is you can put the solar panel in the MPP I see this is very important point.
     
  8. pilko

    Senior Member

    Dec 8, 2008
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    20
    I am not sure if you understand that you can connect the cells in series or parallel or a combination of both.For example,you can double the current by connecting two series strings in parallel.
    If you connect two series strings of 30 cells in parallel you will get 16.5 volts at 7.7 amps
     
  9. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
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    Please be aware that any increase in current will be accompanied by a proportional (or greater) drop in voltage. Power can only be increased by improving cell efficiency, by adding more cells, or by getting more light.
     
  10. aew2020

    Thread Starter New Member

    Mar 17, 2009
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    0
    Thank you.... I think that is what I was looking for and I am trying that now. Hopefully it works, at this point any increase in amps will be great. I will let you all know how it turns out tomorrow. Again.. I THANK ALL OF YOU FOR YOUR HELP!!!!!!!!
     
  11. pilko

    Senior Member

    Dec 8, 2008
    213
    20
    Connect your cells as shown in diagram.
     
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