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How to connect 35-40 white colour LED's to 12V, 7Ah Battery

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Discussion in 'LEDs and Optoelectronics' started by Just_New, Nov 18, 2012.

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  1. Nov 18, 2012 #1
    Just_New

    Just_New

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    Nov 18, 2012
    :confused:

    I am a newbie to this forum. I know to assemble circuits by referring to circuit diagrams. a commerce graduate with very basic theoretical knowledge of electronics . That's me.

    I want to light up my house (3 rooms + 2 halls + kitchen + some exterior area) using 35-40 LED's when the power fails. I'll do the switching of the circuit manually (to begin with) but can someone help me with how to wire the LED's. (Parallel or serial, with / without resistors, I don't know what's best) I can certainly assemble / wire them up if someone can show me circuit. :)

    I have a 12V 7Ah battery to light up the LED's. Can someone help me ?
     
  2. Nov 18, 2012 #2
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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  3. Nov 18, 2012 #3
    Just_New

    Just_New

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    Nov 18, 2012
    Hi Steve,

    I did notice it and thanks for your reply as well.

    The link to the wizard at http://led.linear1.org/led.wiz was helpful

    Just a thought. Wouldn't the 7Ah do any harm to the LED's ?:confused:
     
  4. Nov 18, 2012 #4
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Not if they're connected properly.

    7Ah is a measure of capacity. (Would a large tank of fuel damage your car?)
     
  5. Nov 18, 2012 #5
    Just_New

    Just_New

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    Nov 18, 2012
    Hi Steve

    Good one. I liked your analogy of comparing 7Ah to a big fuel tank :)

    Now this one is a manually operated circuit, Isn't it ?

    To take it a step further - How would i modify the circuit to switch on automatically when the power fails ?
     
  6. Nov 18, 2012 #6
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    A simple way is to have a relay that is energised by the mains. When the mains fails, the relay drops out and the NC contacts make the circuit which turns on the lights.
     
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