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Using an induction Hob from a modified sine wave inverter

Discussion in 'Technical Discussion' started by david_japp, Nov 10, 2011.

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  1. david_japp, Nov 10, 2011
    #1
    david_japp

    david_japp Senior Member

    Joined:
    Feb 7, 2005
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    Location:
    london
    we have a 10 year old 3500W Mastervolt "modified sine wave" inverter on board that works fine but we are replacing it with a new "pure sine wave" inverter, as Im told that many modern sensitive systems such as plasmas and laptops need a pure sine wave. We are considering retaining the old inverter as dedicated inverter to power an induction hob (Gaggenau) for when we are at anchor at night and dont want to run the generator. One issue of concern is that the hob can use as much 7500 watts at start up when all rings are on full, so a careless cook could overload the inverter. The other more important issue is whether or not the induction hob needs a pure sine wave. Gaggenau are (needless to say) non-committal to the point of being unhelpful, as they say Hobs are domestic products not designed for boat use, so will not comment except to refer me to the user manual which doesn't really help answer my questions.

    Has anyone any experience of using an induction hob from an inverter and if so was it was a modified sine wave inverter ?
  2. jhall767, Nov 10, 2011
    #2
    jhall767

    jhall767 Senior Member

    Joined:
    Jan 14, 2010
    Messages:
    331
    Location:
    Middle River MD
    That's a tough one. Generally induction heaters rectify A/C voltage into DC and rapidly switch the DC to create the induction. I would say if there is no step up/down transformer before the rectifier it will probably work just fine. Might even be more efficient.

    Perhaps you tell them you have solar/wind powered "house" and want to know if it is ok to use the induction stove off of the inverter/batteries at night.

    That is a residential application after all. Better yet tell them you are building the house and want to specify an induction stove for it.

    As to overload the inverter is probably already protected but you could add in a breaker or fuse just in case.