help neeeded with solar powered battery charger

Discussion in 'The Projects Forum' started by Oss, Feb 19, 2009.

  1. Oss

    Thread Starter New Member

    Feb 19, 2009
    2
    0
    In the firist i want to wish for all helpful tips and trics what i ind in here.
    i hat a problem witch an solar powered supply witch i use for charge an lead acid battery but i cant find an circuit to cut off the power when its done to avoid damage the battery (14.4V+). i tested a lot of probable solutions but none of them work corretly. if anone can help or give me a tip?:confused::confused:
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Hi Oss,
    Can you post the schematics that you have tried?

    Tip: use the "Go Advanced" button below the reply box, and use the "Manage Attachments" button. The .PNG format for graphics is preferred; as they are fairly compact and not "lossy" like .JPG. Image sizes must be less than 100k bytes.
     
  3. Oss

    Thread Starter New Member

    Feb 19, 2009
    2
    0
    in the first schematic i had an tooo high voltage drop in output and ater that a tried a few variations of solve that problem with relay the resistor in the second battery is only for the internal resistance of the battery. in the second pic a solved the voltňage drop problem but in that case i cant made an reference voltage for the OP Amp beacuse i want to made it to cut off the power only when a voltage in battery reaches 14.2 V.

    P.S
    Ow and please exuse me from my terrible grammar...
     
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