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Thread: which battery?

  1. #1

    Default which battery?

    hi friends,
    i am having motors that at max load pulls 9 amp each or else around 1 amp....
    and d batteries which i have is only 1.2 Ah so how much current is drawn max from it??
    and m nt happy with its performance may be because of the battery...
    which battery should i go for?

  2. #2

    Default

    Why not use mini lead acid batteries?

  3. #3

    Default Batteries

    Hi
    I guess you are using 6 V 1.2AH lead acid batteries.
    The current rating 1.2AH means when fully charged it can maintain the voltage of 6V if you draw a current of 1.2 A for an hr.

    You can as well drive a 2.4 A load with it but according to the ratings the battery can maintain the voltage for 1/2 an hr.

    So in your case where the maximum current rating is 9A , if you driving your motor at peak load , the battery will last for 7 mins approx according to calculations . But practically it wont even last that much.
    If it is 1A otherwise it should last for atleast 45mins..Remember the battery never lasts as the rating promises. !!

    YOu could go for higher rating Lead Acid batteries. The one found inside the UPS lasts very long. Its 12V 7 AH.
    Robonics Systems
    Buy quality Robotics Kits for the cheapest rates in India.
    Visit http://robonics.co.in for more details

    My Robotics Blog
    http://roboticsforyou.blogspot.com

  4. #4

    Default

    i am using 12 V but dont know why it is not giving that much satisfaction

    here are the 2 motors that i am using:
    http://robokits.co.in/shop/index.php...i1tgin9p8s1s74


    but it doesnt seem to be giving that torque..........it cant move even 3-4 kgs!!!
    m using differential drive on the track system....

    please help me..

  5. #5

    Default

    You are using 12V what batteries ?
    Lead acid or NIMH or Liion .. make sure you have charged it properly..
    If you are using Lead acid battery you can charge by directly rigging it to the 12v adapter .. It will work fine ..
    Robonics Systems
    Buy quality Robotics Kits for the cheapest rates in India.
    Visit http://robonics.co.in for more details

    My Robotics Blog
    http://roboticsforyou.blogspot.com

  6. #6

    Default

    yes i am using lead acid batteries...

  7. #7

    Default

    Then I guess it must supply the demand ...
    Test the amount of current your motor draws and then choose the battery .. You can also test it by hooking up your motor to your DC adapter..

    If it draws more current go for a battery of higher rating..
    Robonics Systems
    Buy quality Robotics Kits for the cheapest rates in India.
    Visit http://robonics.co.in for more details

    My Robotics Blog
    http://roboticsforyou.blogspot.com

  8. #8

    Default try these things

    Hi hardikcool,

    You can try using a battery eliminator. If they dont work with that, then there is something wrong with the motors. If you can get an SMPS, that will be awsome (maybe get it on rent before buying it). two motors with that kind of torque should be easily able to carry ATLEAST 16KG of weight.

    Also, which motor driver are you using? it could be that the driver is not high current. You would need a driver that can handle 9.5- 10Amps for each of the motors.

    Were you able to get the torque from the motors? i too wanted to buy those motors but after reading your post, i dont know if it would be a good choice. Please let me know your results so far and the motor driver that you are using

    Pranav

  9. #9

    Default

    actually i am not getting the powerful battery so cant say whether it will give that much torque or not and other prob is 1 of the motor seems to be a little slower than the other so bot constantly takes left turn although m pushing it straight.........

    and also i am not using any motor driver coz its wired one right nw......

  10. #10

    Default try this

    Quote Originally Posted by hardikcool
    1 of the motor seems to be a little slower than the other so bot constantly takes left turn although m pushing it straight.........

    and also i am not using any motor driver coz its wired one right nw......
    split the power distribution into two parts.
    attach more batteries to the slower motor and see the combination that gives you a nearly straight trajectory . Also, consider starting with a smaller robot and then move to a bigger project..... i am just curious, what are you trying to build? :roll:


    there may also be a safety issue here (but i am not sure). plz research the maximum current draw that your battery supports.

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