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What type of battery would this required?

Discussion in 'Electronics Homework Help' started by Nick90, Dec 1, 2012.

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  1. Nick90

    Nick90

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    Dec 1, 2012
    Hey there,

    Ok so I'm a total beginner when it comes to electronics, as I'm a product designer at university, but in one of my projects I have an air pump and have to be able to justify if my product will be mains powered or battery powered.

    So if someone could basically explain to be how I would calculate what size of batteries it would require and how long they would last it would be greatly appreciated.

    I bought a generic pump online and one of those electronic readers and it seems to be averaging about 5-6W, 0.025A and 240V.


    Sorry if that doesn't make sense, I'm not very experienced as i said.
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,322
    2,239
    Nov 17, 2011
    That sounds like the pump is driven by AC. A battery delivers DC. You can use a DC/AC inverter to generate the necessary AC from a battery. But unless using a battery is mandatory (e.g. for portability) I would not recommend that venue.

    Be careful when handling 240 V. If in doubt, get expert help from someone who knows how to deal with that stuff.
     
  3. Nick90

    Nick90

    7
    0
    Dec 1, 2012
    Thanks for the reply, yes I'm almost certain that I think be running the product from the mains, not battery, I just need to put this into my project to show I've taken into consideration every possible option.

    Ok say i got my hands on a DC air pump instead, what would the equation be to calculate how long the battery would last at a constant drain?

    Thanks
     
  4. davenn

    davenn Moderator

    13,647
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    Sep 5, 2009
    Hi there Nick
    welcome :)

    well we cant answer that till you actually get a pump and tell us what its spec's are ;)

    cheers
    Dave
     
  5. davenn

    davenn Moderator

    13,647
    1,884
    Sep 5, 2009
    Hi there Nick
    welcome :)

    if the pump is say 12V and requires 1Amp, then you need to consider how long you want it to run for 2 hrs, 10 hrs etc etc and get a battery with the Amp-hour rating to suit with a bit extra
    An example a 12V battery with a 7A/H rating and if it was 100% efficient ( it wont be) you could get a 7 Amp drain for 1 Hr or 7 hours at 1Amp / hour.
    In practice that doesnt happen, as with time the battery voltage drops off and it looses its ability to continue to supply the required current. I would expect somewhere around 5 hours of life from a 7A/H battery contineously drawing 1 Amp

    that will give you a reasonable approximation... it will also be determined by things like the quality and type of battery of the battery. eg sealed lead-acid, NiMH, LiPO etc


    cheers
    Dave
     
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