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  1. #1
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    Feb 2010
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    Question Inverter not working for some appliances?

    I have a Freedom 20 system (now owned by Xantrex). It has a 2kw inverter which feeds all my AC sockets. It works fine and I can control it via a Link 2000 control panel.

    It works for a 1kw kettle, power tools and laptops fine. However I can't get it to engage when I use an 1700w induction hob that I just bought even on lower powers like 500w - 1kw. I have also found that it didn't work when I tried to use an electric blanket, more out of curiosity than anything haha!!!

    What in the induction hob or electric blanket is preventing the inverter outputting the necessary power and is there anything I can do?
    www.Chasing-Contours.com - A circumnavigation by boat, bikes, climbing & paragliding

  2. #2
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    Default Re: Inverter not working for some appliances?


  3. #3
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    Default Re: Inverter not working for some appliances?

    Quote Originally Posted by northcave View Post
    I have a Freedom 20 system (now owned by Xantrex). It has a 2kw inverter which feeds all my AC sockets. It works fine and I can control it via a Link 2000 control panel.

    It works for a 1kw kettle, power tools and laptops fine. However I can't get it to engage when I use an 1700w induction hob that I just bought even on lower powers like 500w - 1kw. I have also found that it didn't work when I tried to use an electric blanket, more out of curiosity than anything haha!!!

    What in the induction hob or electric blanket is preventing the inverter outputting the necessary power and is there anything I can do?
    Your inverter has a modified sine wave output and an idle circuit cut out feature.
    I suggest that the hob and electric blanket when fed with a modified sine wave appear as no load and trigger the power saving idle cut out.
    To test this try powering an item that it does work with as wells the one that It doesn't.
    Just call me Dougal, Sir Dougal to you.

  4. #4
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    Default Re: Inverter not working for some appliances?

    Quote Originally Posted by Lon nan Gruagach View Post
    Your inverter has a modified sine wave output and an idle circuit cut out feature.
    I suggest that the hob and electric blanket when fed with a modified sine wave appear as no load and trigger the power saving idle cut out.
    To test this try powering an item that it does work with as wells the one that It doesn't.
    Yeah I thought that too but idle is set to only 4w. The induction hob does turn on and the fan draws 15amps from the batteries. The 240v meter comes to life when the hob is powered but when I turn in any heat setting it just doesn't they hot. Same as the electric blanket. It lights up and shows it as "on" but nothing heats.
    www.Chasing-Contours.com - A circumnavigation by boat, bikes, climbing & paragliding

  5. #5
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    Default Re: Inverter not working for some appliances?

    Quote Originally Posted by Murv View Post
    Thanks. Yes so it appears as my modified sine wave inverter is not compatible then with the induction hob. Either I need to find a job that does work with a modified sine wave (which could be difficult), or I need to test the max output of my high power 12v kitchen sockets to see if I can plug in a portable 2kw intverter capable of giving a pure wine wave.
    www.Chasing-Contours.com - A circumnavigation by boat, bikes, climbing & paragliding

  6. #6
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    Default Re: Inverter not working for some appliances?

    Quote Originally Posted by northcave View Post
    Yeah I thought that too but idle is set to only 4w. The induction hob does turn on and the fan draws 15amps from the batteries. The 240v meter comes to life when the hob is powered but when I turn in any heat setting it just doesn't they hot. Same as the electric blanket. It lights up and shows it as "on" but nothing heats.
    Ah, I misunderstood your post, by "can't get it to engage" I thought you meant no output.
    So, let's go for the second option.
    Many devices with power control rely on timing from the zero crossing point of a sine wave (thyristor/triac) dimming. A modified sine wave does not have a zero crossing point and ad such the power control circuits that rely on one won't get the trigger they require.
    The hob fan doesn't use a power control and so runs, the heating part does.. Is there a temperature control on the blanket?
    As an experiment try blanket and hob set to low power (just over 1/4) of maximum. If my guess in the not quite dark of the electronics in those devices is right, that will give full power in both cases.
    Just call me Dougal, Sir Dougal to you.

  7. #7
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    Default Re: Inverter not working for some appliances?

    Quote Originally Posted by Lon nan Gruagach View Post
    As an experiment try blanket and hob set to low power (just over 1/4) of maximum. If my guess in the not quite dark of the electronics in those devices is right, that will give full power in both cases.
    Sorry could you explain what you mean by "blanket"?

    Edit: electric blanket of course sorry.
    Last edited by northcave; 29-06-18 at 15:04.
    www.Chasing-Contours.com - A circumnavigation by boat, bikes, climbing & paragliding

  8. #8
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    Default Re: Inverter not working for some appliances?

    Quote Originally Posted by northcave View Post
    Thanks. Yes so it appears as my modified sine wave inverter is not compatible then with the induction hob. Either I need to find a job that does work with a modified sine wave (which could be difficult), or I need to test the max output of my high power 12v kitchen sockets to see if I can plug in a portable 2kw intverter capable of giving a pure wine wave.
    I suspect you might struggle, at full load the cables will be delivering the best part of 200 amps, that needs a hefty piece of wire!

    If it's of interest, I did resolve my problems by buying a rather fancy pure sine wave inverter (2nd hand) off somebody on here. It worked faultlessly, then burned out one day a few months later.
    A new replacement simply wasn't worth the cost, so I fitted a Chinese one from ebay which was a fraction of the price. Not had it that long, but it's been absolutely fine so far and powers everything without issue.
    I did, however, wire an isolator switch inline, just in case I do want to shut it down in a hurry!

    EDIT: I'm assuming he's referring to your electric blanket?

  9. #9
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    Default Re: Inverter not working for some appliances?

    I wonder if anyone has tried or uses a standard electric hob? Pretty cheap and within the Wattage range:

    http://www.argos.co.uk/product/3328600

    IMG_9848.jpg
    www.Chasing-Contours.com - A circumnavigation by boat, bikes, climbing & paragliding

  10. #10
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    Jan 2016
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    Default Re: Inverter not working for some appliances?

    Wave form and frequency I’m afraid. My Nespresso machine doesn’t work on the modified sine wave inverter but on the pure sine I have installed, now functions fine.

    If you hadn’t mentioned the electric blanket, I’d have said check the pans as when I bought my house, it had an induction 6 burner job in which I couldn’t get to heat up...... wrong type of pans
    Electrician In Ipswich & Southwold Yard
    Custom Panels, Eberspacher/Webasto, ECU Remapping

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