Charge controller circuit project

Discussion in 'The Projects Forum' started by hovik, Sep 21, 2009.

  1. hovik

    Thread Starter Member

    Sep 21, 2009
    I am making a control circuit for charging of a 12 V battery, and I'm having problems starting because I can't figure out how I could measure that the battery is fully charged.

    If I apply 12 V (DC) to the battery, and the battery becomes fully charged... the node with the applied 12V and the battery 12V will be the same... or?
    So how can I know?

    And also, if applied 14 V for charging the 12V battery... what would happen?
  2. beenthere

    Retired Moderator

    Apr 20, 2004
  3. Audioguru

    AAC Fanatic!

    Dec 20, 2007
    A 12V battery is not 12V when it is fully charged.
    It will barely charge from a voltage as low as 12V.
  4. SgtWookie


    Jul 17, 2007
    Just saying "12V battery" is far too generic.
    Lead-acid, sealed lead-acid, NiMH, Ni-Cad, etc. etc... there are many different basic battery chemistries, and then there are different construction methods used within the various categories, and a wide variety of Ah or mAh ratings in each type.

    They all have different charge /maintenance requirements.