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Discussion in 'Power Electronics' started by homesman, Feb 11, 2018.

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  1. homesman


    Feb 11, 2018
    I have bought a 1/2hp 90vac 1ph motor on ebay. My need is to convert 12vdc to the 90vac, but am having trouble fining a inverter that will invert to 90. Will a inverter that does invert to 110vac work with this 90vac, or do I need to send this motor back?
    Last edited by a moderator: Feb 11, 2018
  2. Hopup


    Jul 5, 2015
    You can reduce the voltage using variac. They are widely available on Ebay and other sites.
  3. duke37


    Jan 9, 2011
    A 20V transformer can be used to subtract 20V from the invertor output.
    The motor may not like a non sine supply. What does your invertor supply?
  4. flippineck


    Sep 8, 2013
    Watch out as well for the cheaper inverters that claim a certain power rating but fail to deliver it for a number of reasons.

    I bought one from a Chinese Ebay supplier that claimed '3000W / 6000W peak' but in practise it only seems to be able to reliably cope with much less. Connecting a 2400W kettle causes it to go into instant overload protection. I only use it to run the LED lighting in my caravan now. I resorted to a diesel generator for the kettle etc.

    I understand many types of load classed as 'inductive' (some motors, fluorescent tube ballasts etc) take a much higher current than normal for a few seconds on start-up, such that you might need an inverter with a rating much, much higher than the appliance's normal constant running rating in order to get it started reliably.

    I might be wrong but I think there's a technology called 'soft start' on some inverters that tries to cope with inductive loads by slowly ramping up the output on load connection, so there isn't so bad of a sudden current rush
  5. JWHassler


    Dec 22, 2014
    Where did you get a 90 volt AC motor?
    Ninety volts DC is very common
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