Calculation for power consumption

Discussion in 'The Projects Forum' started by j3r, Nov 3, 2011.

  1. j3r

    Thread Starter New Member

    Jan 9, 2011
    15
    0
    I want to power a device using solar panel. The device's manual stated
    Recommended power supply 24 W, 24 VDC
    Power consumption 15 W maximum

    Obviously i need a 24W solar panel. However i'm kinda of confuse as with Ampere Hour.

    For example, i want to let me device run for 1 day 24 hours on 24Volts @ 1A.

    How do i calculate the required power?

    P = V*I

    I'm missing the duration. Hmmmmm.
     
  2. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    Power is instanteneous. Energy is based on time x power.
    So over 24 hours your device consumes 24x24x1 Wh = 0.576kWh.
     
  3. j3r

    Thread Starter New Member

    Jan 9, 2011
    15
    0
    Thanks for the reply. Sorry, i missed out some information.

    Between the device and the panel lies a battery management system. Connected to the battery management system are 2 batteries total having 28.8V (14.4V each)

    I wanted to have the solar panel which can be connected to the battery management system so that it can charge the batteries. However i'm confuse which to choose.

    There's a 32Watt one, 60 watt one...........


    Many thanks!
     
  4. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    It shouldn´t matter, it will only take longer to charge the batteries with smaller-wattage panel. Also the Ah rating of the batteries is another factor in how long will it take to charge them.
     
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