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Buck or boost for charging a battery

Discussion in 'Power Electronics' started by f123, Nov 6, 2018.

  1. f123

    f123

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    Oct 26, 2018
    If I have a deep cycle battery and I want to charge it using MPPT method from the solar panel. There will be some time in a day where the voltage from the solar panel will be less than the voltage of battery, in this case the buck converter will not work? and maybe this will make current flow in the opposite direction damaging the solar panel. Do we have to maybe use buck-boost converter instead?
     
  2. davenn

    davenn Moderator

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    You should use a decent MPPT controller that has built in reverse current protection ... any good unit will have it
     
  3. f123

    f123

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    Oct 26, 2018
    Thank you for ur answer, I will be designing this MPPT controller and will consider the reverse current protection. but I want to know the best option for cases where the output voltage is less than the input, which creates a problem here. Maybe in using buck-boost with MPPT method? but I am not sure if it is possible or not
     
  4. davenn

    davenn Moderator

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    that would require some fancy switching for it to detect input voltage level
    tho they may exist, I don't know if a buck-boost unit that will do that
     
  5. f123

    f123

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    Oct 26, 2018
    I think I have to do more research about this.

    Thank you, davenn for ur answers
     
    davenn likes this.
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    If you use a flyback inverting topology it won't matter if the panel voltage is higher or lower than the battery voltage.
     
    davenn likes this.
  7. davenn

    davenn Moderator

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    always a good thing :) you may end up finding it better to buy than build ?

    you are welcome

    come back in the future and let us know how you got on :)
     
    f123 likes this.
  8. f123

    f123

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    Oct 26, 2018
    is it because the flyback converter is a Buck-Boost converter ?
     
  9. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    The key point is "inverting". This allows you to do buck or boost with a very simple topology.
     
    f123 likes this.
  10. f123

    f123

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    Oct 26, 2018
    Thank you steve!
     
    davenn likes this.
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