Loss in a transformer winding?

techntrek
techntrek Solar Expert Posts: 1,372 ✭✭✭
in Off Grid Solar & Battery Systems #1
Has anyone measured the loss in a generic 1-to-2 transformer winding (any size)? I know some use a 120-to-240 transformer to handle a specific load when all other loads are 120 volts, and I may have this need in the future. I'm trying to figure out how efficient they are. For some reason up to 10% loss sticks in my head.
4.5 kw APC UPS powered by a Prius, 12 kw Generac, Honda EU3000is
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Comments

  • nsaspook
    nsaspook Solar Expert Posts: 396 ✭✭✭
    #2
    Re: Loss in a transformer winding?

    From 90% to 98% typical with grid AC power devices, with Toroidal Transformers on the top end of the scale in price and efficiency.

    http://www.powertronix.com/high_efficiency.php
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  • techntrek
    techntrek Solar Expert Posts: 1,372 ✭✭✭
    #3
    Re: Loss in a transformer winding?

    Exactly what I'm looking for, thanks.
    4.5 kw APC UPS powered by a Prius, 12 kw Generac, Honda EU3000is
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  • RCinFLA
    RCinFLA Solar Expert Posts: 1,485 ✭✭✭✭
    #4
    Re: Loss in a transformer winding?

    Any reasonable transformer used for power transformation should be in the 98% range. This does not include your average 'wall wart' transformer that can throw away a couple of watts unloaded.

    Efficiency does drop off at very low (<2%) rating loading where the primary magnetizing core losses dominate.

    Losses are VA based, not true power watts.
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