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Inverter

Discussion in 'Electrical Engineering' started by Russell, Dec 14, 2003.

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  1. Russell

    Russell Guest

    I just purchased an "inverter". Specifically, a Motomaster Nautilus 450W
    Power
    Inverter.

    The instructions include the following caution :
    Output non-sinusoidal. Do not use with following equipment:
    -small battery operated products such as rechargeable flashlights, some
    rechargeable
    shavers, and night lights that are plugged directly into an ac receptacle
    to charge.
    -certain battery charges for battery packs with power tools. These chargers
    will have
    warning labels stating that dangerous voltages are present at the chargers
    battery
    terminals.

    Primarily I wish to know if this invertor can be used to charge my 14.4V
    batteries
    for my mastercraft drill. I have the 1 hour charger. The charger does not
    have the
    warning mentioned above printed on it, but I no longer have the instructions
    that came
    with it. The charger is quite heavy and therefore I assume it contains
    transformer,
    rectifier, etc..

    I'd also like to know what it is about the power supply design of some
    equipment that
    makes it incompatible with a non-sinusoidal power source.

    Thanks,
    Russell Wardman
     
  2. Jerry G.

    Jerry G. Guest

    These low cost inverters are not sinewave output as like your power from the
    electricity supplier in your home. Any device that uses a power transformer
    can be damaged. Power transformers unless designed to use other types of
    waveform drives require sinewave drive.

    You can only use devices that employ a switching supply, and or do not have
    any power transformer driven off the mains AC. Some types of electric
    drills (not the chargeable type that have a power transformer), A computer,
    some types of monitors, some types of printers, motor with brushes only,
    and other similar devices with work. Most audio amplifiers, CD players, and
    older models of VCR's use a power transformer. These cannot be used with
    this inverter.

    These are very good for incandescent lighting, and other simple things. What
    you really need is a sinewave type inverter. This is going to be a bit
    expensive.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    =========================================


    I just purchased an "inverter". Specifically, a Motomaster Nautilus 450W
    Power
    Inverter.

    The instructions include the following caution :
    Output non-sinusoidal. Do not use with following equipment:
    -small battery operated products such as rechargeable flashlights, some
    rechargeable
    shavers, and night lights that are plugged directly into an ac receptacle
    to charge.
    -certain battery charges for battery packs with power tools. These chargers
    will have
    warning labels stating that dangerous voltages are present at the chargers
    battery
    terminals.

    Primarily I wish to know if this invertor can be used to charge my 14.4V
    batteries
    for my mastercraft drill. I have the 1 hour charger. The charger does not
    have the
    warning mentioned above printed on it, but I no longer have the instructions
    that came
    with it. The charger is quite heavy and therefore I assume it contains
    transformer,
    rectifier, etc..

    I'd also like to know what it is about the power supply design of some
    equipment that
    makes it incompatible with a non-sinusoidal power source.

    Thanks,
    Russell Wardman
     
  3. You should not use it with anything which might have transformer on the
    input, working at the frequency of the mains. Transformers do not take
    kindly to being connected to the square wave type output of an
    inverter. This includes anything with a wall wart.

    --
    Regards,
    Harry (M1BYT)...

    Remove the 'NOSPAM' in my email address to reply.

    Free Amateur Radio Courses:-
    http://www.ukradioamateur.org
     
  4. Russell

    Russell Guest

    Is it correct to say that the transformer does not "take kindly" to the
    square
    wave because it passes the 60 hz component but the higher frequency
    energy is turned into heat by the core and the heat is then the destructive
    force?
    This seems logical, but does not explain the manufacturers warning not to
    use the inverter with chargers that warn of dangerous voltages at the
    the chargers battery terminals.
    Russell
     
  5. On 14/12/2003 "Russell" opined:-
    I cannot think of a suitable explanation for this, so I will pass on
    that one.
     
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