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cheaper power by low tariff battery charging?

Discussion in 'Hobby Electronics' started by MisterE, May 22, 2008.

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  1. MisterE

    MisterE Guest

    So I heard about a guy who has a fake water heater that was actually a bank
    of lead-acid batteries with an inverter. The idea being he gets power for 8
    hours a day to charge the batteries and then powers his home from the
    inverter, so he gets all his energy at at the cheap 6c tarriff instead of
    15c. Apparently he recons it isn't even illegal, since it actually says that
    any "Electric Storage Water" device can be connected, and you could argue
    the batteries are just that.

    Apparently this is very commonly done in buisnesses. Legally they can hook
    up anything they want to tarriff 22, because its the same line, they just
    pay 7cents instead of 21c/15c by drawing power between 9pm and 7am. Now I
    know why some many places have those huge 6kw UPS systems with shelves of
    batteries that they can run of for days.
  2. terryc

    terryc Guest

    lol, fool, you should have stayed awake during basic maths then you would
    have realised how insignificant that amount is.
  3. fritz

    fritz Guest

    Sounds like the kind of Einstein who has an energy polariser in his cold-water
    fusion powered car.

    The losses involved in charging batteries and then discharging them through
    an inverter would wipe out any potential savings. Plus, Einstein would have
    to buy and maintain/replace the batteries and buy the inverter.

    Doesn't make sense to save money on off-peak, they are probably just standby
    power systems for emergencies.
  4. Mr.T

    Mr.T Guest

    Why? Off peak is cheaper mostly because it utilises unused capacity. That
    doesn't change no matter what you do with it.

  5. Dan

    Dan Guest

    Its because they don't have to pull the generators off and on. Companies are
    also given huge discounts if they can get their load factor (maximum current
    divided by average current) down to a minimum. In same cases companies can
    deliberatly waste power to get the average up, and its still cheaper,
    because they get a discount factor for having a low load factor! i bet the
    greens love that one. You can get charged more for less overall power
    because it you are inconsistent in the use and the generators have to come
    on and off, which is the real cost. I read a report that said if 50% of our
    power came from solar, the remaining power would be charged at nearly 8
    times what it is today, just from the exessive cost of having to switch
    generators in and out at sunset/sunrise etc. I wonder why it is so
    expensive? The power companies were trying to use it as a reason to pay
    people less for power they pump into the grid than power they draw out.
  6. terryc

    terryc Guest

    Lol. can you give your reference for that?
    Sounds like bullshit from some one who doesn't understand what is going
    on. Aka generator says you actually draw so much power because of your
    bad PF, so we'll charge you that much. Improve it and you'll save money.
  7. Mr.T

    Mr.T Guest


    Well not quite a "bonus" when you are burning coal or gas, (even water
    reserves for hydro are finite) but yes many turbines are essentially idle,
    and therefore as I already stated, underutilised at those times.
    OP nuclear of course would be at almost no additional cost, (just
    supervision & maintenance costs) if we had any that is.
    Not to mention wind is generally stronger during the day too.

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