Power usage

Discussion in 'Tech/Mech General' started by Darren, Aug 30, 2016.

  1. Darren

    Darren Funster

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    i have a two 125amp batteries joined together making a ban k of 250. I also have an inverter connected to these batteries, how long could I safety run a 30 watt fan for roughly with this set up ?
     
  2. WillH

    WillH Funster

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    Quick calculation indicates 50 hours provided nothing else on, no charge, batteries fully charged at start and in new condition.
     
  3. Darren

    Darren Funster

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    Thank you
     
  4. scotjimland

    scotjimland Funster Life Member

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    As @WillH said.. and for future reference.. how that answer is worked out

    Fan draws 30w /12v = 2.5 Amps

    To protect the batteries, good practice is not to go below 50% capacity..

    So, you have 125Ah capacity ( 50% of 250ah ) 125/2.5 = 50hrs
     
  5. Darren

    Darren Funster

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    Thank you scotjimlad I will keep a note now on how to work it out
     
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