Inverters, difference between modified sine wave & pure sine wave

Discussion in 'Trucking Electronics, Gadgets and Software Forum' started by onebadsnoopydog, Jan 3, 2019.

  1. onebadsnoopydog

    onebadsnoopydog Bobtail Member

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    Ok, so I'm not new but if it isn't dc powered im lost. I recently bought a Frigidaire mini frig/freezer combo. I keep burning out my 5k inverter. I tried using a induction table top burner and it powers on the unit. But it won't cook. I am running the new harbor freight Jupiter 5k modified sine wave inverter. First question, what's the difference between modified sine wave and pure sine wave? Second, why won't the induction burner work? 3rd, for some reason i keep getting low voltage warnings when nothing but the fridge is on. I have 3 month old batteries, my truck volt gauge reads 14v, my amp meter it just a hair above 0. Any help would be greatly appreciated.
     
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  3. x1Heavy

    x1Heavy Road Train Member

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    The table top cookers either induction or resistance coil uses ENORMOUS amounts of power. Your piddly inverter aint got the beef to feed those things much less be able to vent itself trying to while it quietly burns up.

    Even if you did get the table top going strong cooking or frying etc, I hate to think of the plastics all around you plus flammable sheets in your bunk and vapors from your dirty side box with all the grease, oils fluids etc.

    Find yourself a nice set of 12 volt cooking pan, dutch oven etc. Put together something that dont take much to cook on those little things. even if the Dutch Ovens take a few hours. You are not in a hurry.

    Maybe I got it all wrong on my end, words are difficult to imagine what exactly you are using without pictures.

    the sine has to do with the ability of computers to enjoy good smooth power. They have to have it a certain way. Im too sick to properly lecture about sine this morning. But I'll leave it to someone else to get into it.

    I hope you have a better day.
     
  4. tnevin225

    tnevin225 Road Train Member

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    Sounds like you have a problem somewhere. That Inverter should handle the fridge with no problem, Like X-Heavy said the table top burner takes a huge amount of juice, you will probably need to leave the truck running while your using it. Remember that your batteries are not made to have huge draws of power off of them unless you have something like a deep cycle batteries installed. Might make sure your cables to the batteries are big enough to handle the load your putting on them, I would use something around 12 gauge wire, as far as the fridge goes what do you mean by it keeps burning out the Inverter? Is the Fridge New or used?
     
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  5. onebadsnoopydog

    onebadsnoopydog Bobtail Member

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    So the fridge is about 3 months old and the battery cables are to the inverter are the same gauge as the truck battery cables. As for the truck running I don't turn it off
     
  6. tnevin225

    tnevin225 Road Train Member

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    I wonder if maybe you just got a bad Inverter, it does happen once in a while.
     
  7. flood

    flood Road Train Member

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    by burning out you mean you have to keep replacing the invertor...? or is it blowing out the fuse....?
    you do know that INDUCTION COOKERS REQUIRE special pan's right.....you can't use standard pot's and pan's.. you MUST USE pot's and pan's made for INDUCTION COOKING...
    pure sine wave is what you have in your house (clean power) modified sine wave (dirty power). the wave is not the same and some things REQUIRE clean power like TV, some COMPUTERS, PRINTER
    sound like the wiring to the invertor is to small. standard wire's for a 1,500 watt invertor would be way to small for a 5,000 watt invertor as would be the fuses... most invertors over 2,000 watt need TWO sets of wires and the wires should be BIGGER than your truck battery wires... I use O gauge wire..
     
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  8. onebadsnoopydog

    onebadsnoopydog Bobtail Member

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    Ok burning the inverter out not the fuse. Battery cables are guage "0". And yes I do have induction pans. I am going to get all of my truck batteries checked tonight
     
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  9. x1Heavy

    x1Heavy Road Train Member

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    Not just checked but pulled individually and challenged for load, voltage and so on. Most mechanics in heavy trucks are aware of the necessary process of testing them to reveal if they are dying, dead or playing possum. Or strong and healthy.

    Winter is the one season that kills batteries. In my own vehicle I am on my forth one in 5 years due to our winters. Dehydration is the main issue. I am getting ready to replace it with a sealed one.
     
  10. uncleal13

    uncleal13 Road Train Member

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    I had a modified sine wave 1,800 watt inverter that did everything I ever wanted, but when I bought an induction cooktop, it would not run. The electronics in it are not compatible with a modified sine wave inverter.
    I installed a 2,500 watt pure sine wave inverter and everything worked great after that. Even the microwave worked quieter. Your 0 gauge wires are probably large enough.
    A pure sine wave is like the waves in the ocean, the voltage gradually goes up, then gradually goes down. Nice and smooth.
    A modified sine wave is a crude digital representation that is very choppy.
    modified-sine-wave-vs-pure-sine-wave.jpg
     
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  11. onebadsnoopydog

    onebadsnoopydog Bobtail Member

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    X1Heavy, thanks for the advice, last night I did pull out all the batteries and had them checked. Turns out one of the 4 was bad, and the one my inverter was connected to read to "charge and retest ". They are all 4 months old so I got them replaced. That has solved the inverter sounding the low voltage buzzer.
     
    uncleal13 Thanks this.
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