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1750 watt inverter

Discussion in 'Home Power and Microgeneration' started by Ross Mattson, Nov 21, 2003.

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  1. Ross Mattson

    Ross Mattson Guest

    Canadian tire has been selling these inverters for about a year now for
    about $300.00 plus tax. My question is, Has anyone
    out there tried one yet? I am sure the sine wave is not the greatest. But
    all I want is something reliable, to run a fridge, furnace, lights and
    television on (of course not all at the same time). I know this unit will
    discharge a bank of batteries
    quite fast.
    thanks.
    rm.
     
  2. Glenn Miller

    Glenn Miller Guest

    Hi Ross just to give you some info.

    I have a 400 watt unit. It is a modified sine wave unit.

    Here are some interesting specs about it.

    Name 175W 400W 700W

    Continuous Power 150 300 500
    5 Minutes 175 400 700
    Surge 300 600 1000
    AC Frequenvy --------60 +/- 4Hz----------
    Efficency ------------ 90%------------

    As can be seen in the above table what they advertise as the power rating is
    not
    what it actually is. Buyer beware.

    Overall it is a good unit for the price but the power discrepancy is a let
    down.
     
  3. Danno

    Danno Guest

    Hi there, I am also using the 400W "Eliminator". So far it has powered my
    meagre electrical needs without fanfare. This laptop, cell phone, portable
    DVD player, AA battery charger, razor charger. I haven't actually tried running
    a pump with it though (like a refridgerator). One thing that was pointed out to
    me when I was first looking: although they are marketted as a "modified sine"
    wave, they are actually modified square waves. Either way, they are kinda-sine
    waves, I guess the distinction is technnical, but there it is. Additionally, I
    was advised that, while these will probably work well enough to power most
    things, a pure sine inverter would be a wiser choice for larger draws, or
    devices (like, for instance, pumps or motors) that favour a clean sine wave,
    as they will run more efficiently, using less power in the long run.
    HTH,
    Dan.
     
  4. Brent Eamer

    Brent Eamer Guest

    Although I don't have the canadian tire brand I have a 1500 watt inverter
    that runs a 10 cu ft freezer fine, but not a 16.5 cu fridge, seems the surge
    is to great, as always, buy more than you need.
     
  5. Roger_Nickel

    Roger_Nickel Guest

    Be careful running electric motors off a cheap inverter. Most of them
    use a two step squarewave which means that the harmonic content is
    around 10%. These harmonics generate rotating magnetic feild components
    in the motor which the rotor cannot follow and so the energy in the
    harmonic components is lost as heat. If the motor is normally 85%
    efficient, the thermal dissipation could almost double when running from
    the inverter. Get some specifications for harmonic content of the output
    waveform first. If unavailable, run away.
     
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