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DOES NOT OVERHEAT, RUNS MY WIFE'S SINGER SWING MACHINE SHE BROUGHT FROM HONG KONG YEARS AGO..... SHE HAS MADE NUMEROUS HEAVY SOFA CUSHIONS AND ALTERED SEVERAL PANTS AND JACKETS ...
SEEMS FINE AFTER ABOUT 20 HOURS USING IT OVER TWO MONTHS...
Just remember, as with any "residential quality" transformer, buy 40-70% more output than your normal wattage load, and the transformer life expectancy will increase by double... (I'm retired electrician).
UPDATE 9-6-2012 : Yes, the instructions are next to useless, but now two friends of mine also have these, with no problems either. Transformers are darn near bullet proof or defective one or the other. But if you hook them up incorrectly, they will burn out quite quickly, depending on what you did wrong, and what load was on the transformer.
I just wonder if users are asking qualified people how to hook up, or just winging it.... BTW, I had pretty good luck with their customer service in North Carolina. You might call them if you are unsure of your installation ability.
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First, be aware that when this transformer steps up the voltage, it simply doubles it and that is all it does. Since in the USA voltage is 120 Volts (it has not been 110 volts for a very long time) it outputs 240 volts not 220. It does not change the Hz so the output is 240V 60Hz. You should check whatever you are plugging into the "220V" outlet to make sure that it can operate at 240V 60Hz. The second problem is that the "Universal" outlet does not ground the widely used "Schuko" plug, so saying it is "Universal" is highly misleading. Also, be sure to get a much larger wattage than the nominal wattage of whatever you are plugging into it. I tried a 500 watt version with my 165 watt gelato machine but it kept blowing the fuse when the compressor cycled on. Which brings me to the third weakness which is the fuse sure they give you two spare ones, but a circuit breaker would be much better.That said, this unit is inexpensive compared to what you would have to pay for one with a circuit breaker and a Schuko plug in addition to the "Universal" plug. So it might serve your purposes, just make sure whatever you are going to plug into it will work on 240V 60hz, doesn't use a Schuko plug and doesn't have wattage spikes that are many times their nominal wattage.
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