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How To Interface 12v 10w Solar Panel To 12v 1.3ah Battery

Discussion in 'Power Electronics' started by vijaykrishna, Oct 2, 2017.

  1. vijaykrishna

    vijaykrishna

    35
    3
    Sep 9, 2017
    I need to connect 12v 1.3Ah battery to 12v 10W solar panel do i need any circuit for it or i can directly connect them? also i want to power arduino from that battery.

    Please help
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Place a 14V 20W zener across the solar panel, then connect it to the battery via a 1A diode.

    This should charge the battery to about the float charge voltage (check the battery specs for more details)
     
    vijaykrishna likes this.
  3. vijaykrishna

    vijaykrishna

    35
    3
    Sep 9, 2017
    Thanks,

    Can I connect 12v 1.3Ah battery to arduino DC pin???
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    If it has a voltage regulator you can
     
    vijaykrishna likes this.
  5. vijaykrishna

    vijaykrishna

    35
    3
    Sep 9, 2017
    like, 7812?
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    No, like a 7805.

    The microcontroller requires 5V. Many arduinos have a voltage regulator allowing them to be powered from a higher voltage. If you're using one that doesn't, then 12V will kill it very dead.
     
  7. Doug3004

    Doug3004

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    23
    Sep 5, 2014
    I'm not much of an expert on solar panel systems,,, but it seems to me that using a 12v panel to charge a 12v battery is not usually how it's done. Unless you're talking about the little solar LED yard lights, that are basically just a solar cell hooked right up to a NIMH battery.... but those are not a normal occurrence, and that only works on a fairly small scale (kinda like running a LED straight off a button cell, with no dropping resistor).

    What I've seen is something like this: a solar array that puts out 24 volts--or more--in bright sun, connected to a charge controller that needs at least 18 volts to work, and that in turn is set to charge a 12v battery (to about 14 volts or so).

    The practical problem with solar panels is that they put out a very limited amount of current.
    When you start drawing current off them, the voltage tends to drop WAY down.
     
  8. vijaykrishna

    vijaykrishna

    35
    3
    Sep 9, 2017
    i got 12v dc female connector in my arduino
     
  9. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,191
    2,692
    Jan 21, 2010
    In that case your arduino has a voltage regulator on it (some don't)
     
  10. vijaykrishna

    vijaykrishna

    35
    3
    Sep 9, 2017
    yes it has
     
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