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I need help from a Genius

Discussion in 'General Electronics Discussion' started by exhale666, Nov 9, 2012.

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  1. exhale666


    Nov 9, 2012
    So! I got a relay from Radioshack which requires a 9v 500ma to function. I'm using a 9v battery but it only lasts around 24 hours and I need it to last 5x that long on a battery. So I'm guessing I need a bigger battery but how would I not overload the relay? It goes without saying I don't know much about electronics

    Is there a genius here that could help me with this? a shopping list would be awesome
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Get a relay that requires 9V at 100mA (or less).

    One option is a solid state relay (you don't say what you're switching) which will require a far smaller current.
  3. CocaCola


    Apr 7, 2012
    Depending upon the off cycle it might be best to simply use a NC relay, and then you only need to power it when the relay is 'off' during the 'on' cycle it needs no current... For long on times with short off times this will save a ton of power...
  4. galaxy


    Nov 3, 2012
    Maybe a latching relay?
    Probably be good to tell us what the relay is used for. An energised time of 5 days plus is a long time, there may be better ways to do it than with a relay.
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