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solar panel reverse polarity protection issue

Discussion in 'General Electronics Discussion' started by amit tulsyan, Oct 25, 2016.

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  1. amit tulsyan

    amit tulsyan

    10
    0
    Oct 4, 2016
    Hi,
    Does solar panel too requires reverse polarity protection OR reverse polarity protection is only required in case of battery???

    I tried to explore internet and gone through various post but nowhere i found Reverse polarity protection for solar panel, instead i got reverse current flow to solar panel protection using MOSFET at panel side. It may be possible that same MOSFET might be protecting from reverse polarity too along with reverse current flow protection to solar panel but i am NOT sure.
    But i am sure that the MOSFET used is for reverse current protection.

    Do i require extra MOSFET for reverse polarity protection or the same MOSFET will do the job.
    Please find the attachment. You will find MOSFET Q1 at right corner.

    Can anyone guide me on this.??? It is really important to me.

    Thank you..!!!
     

    Attached Files:

  2. Bluejets

    Bluejets

    4,605
    977
    Oct 5, 2014
    Why would one need reverse polarity protection on a wired in device?
     
  3. amit tulsyan

    amit tulsyan

    10
    0
    Oct 4, 2016
    Due to absent mindedness it may happen that sometime people connect panel or battery in reverse order. So just to avoid that reverse polarity protection is required.
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,480
    2,828
    Jan 21, 2010
    Many grid connect inverters have a diode across the input to effectively short out the panels if you connect them on reverse.

    If you do this, you need to be aware that you should not try to disconnect the panels until night falls...
     
    Last edited: Oct 26, 2016
    amit tulsyan likes this.
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