UPS as a stand alone inverter? [RE-wrenches]

[Hugh Piggott]

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At 4:05 AM -0400 7/9/03, Bill Loesch, Saint Louis Solar wrote:
>Warren,
>
>Thanks for the explanation of how an online UPS can also be a non phantom
>load. Sounds like some energy efficient design went into these boxes.

Strange.  I came to the exact opposite conclusion.  If the 
ferro-resonant transformer is energised all the time then that will 
be a big phantom load.  They are nice things to work with because 
they are so robust but hopeless for 24 hour power supplies with 
variable power loading.

At 4:58 AM +0000 7/9/03, Robert Warren wrote:
>for a PV-UPS, you have about a 10 to 12% loss due to heat and magnetic
>saturation of the ferro transformer. If you can live with that, it is
>worth looking into. However, this efficiency is if you are at 70 to 90%
>of capacity with your load. If you have a load rated at a lot less than
>this, the efficiency goes to hell, as you are on the low end of the
>output efficiency curve.


-- 
Hugh

http://www.scoraigwind.co.uk/

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