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Size of inverter to start a refrigerator?

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Posted by Roger Moss on April 20, 2006, 3:47 pm

I want to get an inverter to run my refrigerator.  It is a normal size
(850*600*600mm), "A" efficiency refrigerator.  The running power is pretty
small - 70W I think - but I'm not sure how much current is needed to start
up the induction motor in it.

Will a 250W inverter get it started, or do I need something bigger?



Posted by John Smith on April 22, 2006, 9:43 pm

Once you get it started off an inverter check the servo motor for the defrost
timer. They are power picky and it may not run at all.

Roger Moss wrote:

Posted by JoeSP on April 23, 2006, 1:37 pm

This and many other similar postings points to the necessity for a
demand-surge capacitor bank.  A very common problem with alternate power is
the need for a much higher load for a brief period of time for things like
starting motors.

I'm not aware of any such devices on the market, but I'm sure a good
engineer could enlighten us.

Posted by Dave Nay on April 23, 2006, 3:17 pm

JoeSP wrote:

The problem there is that capacitors are a DC device, and actually will
filter AC.  For a capacitor bank to be of any use, it needs to be on the
DC side of an inverter, and therefore still limited by the capacity of
the inverter.

Posted by JoeSP on April 23, 2006, 4:57 pm

And therein lies the engineering challenge.

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