Multiple loads

Reply to Thread

Discussion in 'General Electronics Chat' started by Benbonell, May 10, 2013.

Reply to Thread
  1. May 10, 2013 #1
    Benbonell

    Thread Starter New Member

    May 10, 2013
    2
    0
    Hi,

    This may seem a daft question but I have 3x 24 vdc pumps that all require new power supply's.

    Each one draws 24w at max chat, could I use a 70w 24v dc power supply to run all 3? Or what could I use instead.
     
    #1 Reply
  2. May 10, 2013 #2
    MrChips

    Moderator

    Oct 2, 2009
    16,861
    5,174
    Yes, using one 70W 24V supply is ok.
     
    #2 Reply
  3. May 10, 2013 #3
    #12

    Expert

    Nov 30, 2010
    18,078
    9,617
    Umm...almost. 3 X 24 = 72 watts.
    If the pumps only occasionally use the whole 24 watts each, you might get away with it.
     
    #3 Reply
  4. May 10, 2013 #4
    MrChips

    Moderator

    Oct 2, 2009
    16,861
    5,174
    My guess would be that they only draw the max 24W on startup.
     
    #4 Reply
  5. May 10, 2013 #5
    #12

    Expert

    Nov 30, 2010
    18,078
    9,617
    Good point. It would only be a problem if they all started at the same time.
     
    #5 Reply
  6. May 11, 2013 #6
    Benbonell

    Thread Starter New Member

    May 10, 2013
    2
    0
    How much of a problem? They are water circulation pumps but they are variable. They don't really get to 100 percent very often. Would it mean they just run lite?
     
    #6 Reply
  7. May 11, 2013 #7
    MrChips

    Moderator

    Oct 2, 2009
    16,861
    5,174
    We are only talking about all pumps starting up simultaneously.

    If you had three pumps connected to the same power supply and the power was turned on with all pumps on, if the power supply is unable to supply the full current then the voltage will sag. The pumps may drag a bit while starting up or may fail to start.

    Once all pumps are up and running the current required will be lower and should not be a problem as long as the power supply is properly rated.
     
    #7 Reply
  8. May 11, 2013 #8
    #12

    Expert

    Nov 30, 2010
    18,078
    9,617
    These being DC pumps, if you want to start them all at once and they won't, a nice, fat capacitor might fix it by supplying a bit of starting power. Let's play with the math. Three amps, half a second, 1 volt of loss...that's 1.5 farads. That's a huge capacitor. Better to not start them all at once.
     
    #8 Reply
Loading...
Related Forum Posts:
  1. RogerMc

    Impedance matching w/ multiple secondary loads

    Posted by RogerMc in forum: Homework Help
    Replies:
    8
    Views:
    729
  2. gregthegeek

    Voltage regulator, multiple loads?

    Posted by gregthegeek in forum: General Electronics Chat
    Replies:
    28
    Views:
    3,538
  3. hse

    DC loads.....

    Posted by hse in forum: Electronics Resources
    Replies:
    10
    Views:
    2,723
  4. Wendy

    Electronic Loads

    Posted by Wendy in forum: The Projects Forum
    Replies:
    48
    Views:
    11,811
  5. masa6614

    Capacitive loads

    Posted by masa6614 in forum: General Electronics Chat
    Replies:
    2
    Views:
    1,045
You May Also Like:

  1. Considerations for FPGA Implementation of Linear-Phase FIR Filters

  2. An FPGA in an Arduino? New MKR Vidor 4000 Board Brings FPGA Complexity to Non-EEs

  3. Zentri's “Silicon-to-Cloud” is Changing the IoT and M2M Game


Load More Articles