12V Li-ion Battery monitoring system with a switch-over

Discussion in 'General Electronics Chat' started by ricky_ro, Dec 23, 2011.

  1. ricky_ro

    Thread Starter New Member

    Dec 23, 2011
    2
    0
    Hi guys,
    I need something like a battery monitor with a switch-over mode. Basically a voltage regulator should check the voltage level of a 12V Li-ion battery and if it is fully charged it must switch-over to a second battery.

    The battery is being charged using a micro wind turbine with a 9V DC generator.

    Please HELP.

    Much appreciated

    Rick
     
  2. crutschow

    Expert

    Mar 14, 2008
    12,986
    3,226
    How are you charging a 12V battery with a 9V generator?
     
  3. ricky_ro

    Thread Starter New Member

    Dec 23, 2011
    2
    0
    I am thinking of using a 9V DC Permanent Magnet motor at 16000rpm. It should generate a DC current of 3.5A at 13600rpm.

    Even at low rpm I think I should be able to get enough current to charge a Li-ion battery with a capacity of 6500mAh.

    Any suggestion please?
     
  4. Ctenom

    Member

    Nov 1, 2010
    59
    1
    how will it get fully charged a 9v. you seem to be to inexperienced to be playing with lithium chemistry batterys the way you are. at least switch to a 7.2 NiCd if its just to prove a concept you will thank me when you don't burn your house down
     
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