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Hot H20 electricity consumtion metering

Discussion in 'Electronic Basics' started by rob, Oct 16, 2004.

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  1. rob

    rob Guest

    Hi...I need to determing how much electricity a solar water heater is
    replacing. The solar heater preheats the water before it enters the
    electric heater...I need a cheap solution to measuring the electrical
    usage over a months time period....I am thinking an hours meter
    somehow wired might work....Any suggestions?????

    Thanks Rob
     
  2. Bob Masta

    Bob Masta Guest

    This should be pretty simple since in theory you could
    just put an electric (not electronic) clock across the element.
    But the element runs on 220 in most installations, so
    you'd need a transformer or something. And in most
    electric water heaters there are actually 2 separate
    elements, one at the bottom that does most of the
    heavy lifting, and one at the top that kicks in if the
    cold-water line in the tank reaches that high under
    heavy use. So you'd need two separate clocks and
    transformers.

    In my own case many years ago, I wanted to see the
    effect of super-insulating the tank. I just hooked
    little NE2 neon bulbs across the elements, each with a
    CdS photocell next to it and wrapped in electrical
    tape to block stray light. Used a chart recorder I
    happened to have on hand to monitor activity.
    If you have some sort of recording device, this
    approach may work for you as well.

    Best regards,


    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
     
  3. You can purchase a watt hour meter and meter base for that purpose
    from the local electric utility. Or call a local electrician.... try
    ebay...
     
  4. BobGardner

    BobGardner Guest

    I need to determing how much electricity a solar water heater is
    The water heater is either on or off. If you could get a 220V clock, you could
    gator clip that onto the heating element and see how many hrs a dat its
    running. Quick... how many BTUs in a KWHR? ans: 3412
     
  5. rob

    rob Guest

    Yup...that seems to be simplist\cheapest....Thanks all
     
  6. Nick Hull

    Nick Hull Guest

    The water heater is either on or off. If you could get a 220V clock, you could
    gator clip that onto the heating element and see how many hrs a dat its
    running. Quick... how many BTUs in a KWHR? ans: 3412[/QUOTE]

    Since 220 volts uses 2 110 volt legs a 110 volt clock can be made to
    work. Use analog not digital.
     
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