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kwh usage

Discussion in 'General Yachting Discussion' started by directorbman, Feb 1, 2012.

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  1. directorbman, Feb 1, 2012
    #1
    directorbman

    directorbman New Member

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    average household used in 2008 30 something kwh per day.

    What about yachts. Say 150, 200 footer?
  2. C4ENG, Feb 1, 2012
    #2
    C4ENG

    C4ENG Senior Member

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    I do not know the KWH but if you walked on a typical modern 150 ft yacht while on charter at the dock and you went and looked at the KW meter in the ER you would probably find it reading in between 70 and 100 KW during the peak day. Then at night it would probably be reading 50 to 60 KW or so.
    Frequency converters on board sometimes tell you the KW hour usage but I never watched it as I never had to know KWH. In theory you should be able to keep the marina honest with the shore power usage for payment but I never had a problem.
  3. directorbman, Feb 1, 2012
    #3
    directorbman

    directorbman New Member

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    Over a 24 hour period if we count for 16 hours of day and 8 hours as night average of 75kw.

    75kw that's 75,000watts x 24hours = 1,800,000 watt hours which then you would convert this to KWH, 1,800,000 / 1000 = 1800kwh at a rate of $0.10/KWH that would cost 1800 x $0.10 = $180 per day x 30 day month $5,400

    Which sounds high, or my math is off? Can someone who knows their power, and math chime in?

    EDIT: Perhaps I forgot a decimal point on the 1800 supposed to be 180.0kwh? which would be $18 dollars a day or $540 a month??


  4. K1W1, Feb 2, 2012
    #4
    K1W1

    K1W1 Senior Member

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    Hi,

    Recent experience with an 80m Yacht.

    Avg load is 250 Kw which works out to 6000 kwh a day

    Shore Power in yard was 08c Euro ( USD 0,104) a Kwh or 480 Euro a day or 14,400 a month.

    Gensets get through it at around 1950 lt F.O. a Day works out to around 39c Euro (USD, 0,51)a Kwh or 2340 Euro (USD 3,065) a day with tax paid fuel or 70,200 Euro (USD 91,962)a month plus Oil, Filters, Anodes, SOS Costs.
  5. Capt J, Feb 2, 2012
    #5
    Capt J

    Capt J Senior Member

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    Yowzers..........$17k a month in electricity.......
  6. K1W1, Feb 2, 2012
    #6
    K1W1

    K1W1 Senior Member

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    Hi,

    And that was sitting at the dock plugged in, closer to 100k a mo on the hook
  7. Ken Bracewell, Feb 2, 2012
    #7
    Ken Bracewell

    Ken Bracewell Senior Member

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    Since the owner pays that bill I don't have a bill to check the kwh, but we have a dedicated meter at the boss' house and our electric bills are generally around $3000/mo. I always smile a little bit when I am at a marina and they charge between $50-$80/day.
  8. C4ENG, Feb 2, 2012
    #8
    C4ENG

    C4ENG Senior Member

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    That sounds spot on from my experiences, but of course there is always exceptions as some charge more, but $200-250 dollars a day at a nice marina for a 150+ yacht is a normal power charge.
    Thanks for displaying your formula as they are so easily forgotten