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Eliminator MotoMaster 3000 watt modified sine wave digital inverter not producing enough power

I bought a brand new inverter and battery charged it and I am confident I connected it correctly but when I plugged in a hair dryer in only cold air comes out and when I used an induction stove there is barely any heat produced. I am wondering what the issue is that I have enough power to start the appliances but I don't have the power to continue operating it?

Posted by Jeff Wang on

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ADMIN Eric

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  • Electronics ... Master
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Measure the true RMS output voltage and act upon your findings.

Posted on Dec 23, 2021

  • 8 more comments 
  • Jeff Wang
    Jeff Wang Dec 23, 2021

    can you elaborate on "act upon your finding". After doing 30 min of google youtube research I have a vague understanding on what true RMS voltage is and why modified sine wave may not produce the indicated voltage. I am not sure if I have the right equipment to measure true RMS voltage so lets just assume that it produces a lower voltage so what are my options after that then? get a new inverter?

  • ADMIN Eric
    ADMIN Eric Dec 24, 2021

    If the output voltage is too low, RMS is ideal but a standard multimeter will give a good idea, and the battery voltage is around 12.6volts, the invertor is under powered or faulty. If the battery voltage is low, the output may be low because of that. The lower the battery voltage, on load, the more currect the inverter will draw to try and produce the required power output.

  • Jeff Wang
    Jeff Wang Dec 24, 2021

    ok the inverter is producing 12.6 volt so that means i need to connect more batteries in series to increase input voltage? I thought there is a limitation on how much volt you are suppose to provide as input? do I connect the batteries in series instead?

    I have some basic understanding in physics but I have no idea what the specification and standards on how the set up works. If I connected the batteries in series then wouldn't the voltage be doubled as input into the inverter? But I am pretty sure there is only a small window for desired input voltage as specified on the manual. If I connect the batteries in parallel i would be increasing the current and therefore increase the input power right?

  • ADMIN Eric
    ADMIN Eric Dec 24, 2021

    Do you mean the battery voltage is 12.6 volts when the inverter is running?

  • ADMIN Eric
    ADMIN Eric Dec 24, 2021

    It is a 12volt 3kW inverter that is rated at 12volts input and an output of 120volts. Never increase the input voltage to more than the rated voltage of 12volt lead acid; 13,6volts fully charged.

  • ADMIN Eric
    ADMIN Eric Dec 24, 2021

    I will reitterate; if the battery voltage is 12.6volts when the inverter is running, go no higher. The output voltage should be 120volts +-10%.

  • Jeff Wang
    Jeff Wang Dec 24, 2021

    yes you are right the battery voltage input is 12.6v- 12.5v as indicated on the invertor. For a sec I thought it was the output voltage. I don't know how to measure the output voltage. Do I just stick the voltmeter in the output socket? and yes I understand that I should not be connecting the batteries in series. so lets assume the output voltage is lower than what I needed then what are my options?

  • ADMIN Eric
    ADMIN Eric Dec 25, 2021

    If the output voltage is not as described on the specification label for the inverter, time for one that works.
    To measure the output voltage, a good place to start is use a light bulb and your appliance that is not working properly with a two way adaptor. Plug them both in and the light should be at full strength, when you switch the appliance on, if the light dims/goes out and the appliance draws less power than the specified loading of your invertor, then the invertor is probably faulty.

  • ADMIN Eric
    ADMIN Eric Dec 25, 2021

    If it is a 3kW invertor, it will be good for 1kW. 3kW is the peak power, not constant drain.

  • Jeff Wang
    Jeff Wang Dec 25, 2021

    The specification written on the side of the box said 6k watt peak and 3k watt continuous powerhttps://www.canadiantire.ca/en/pdp/motom...
    this also says 3kw continuous and 6kw peak

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