I have recently purchased three transformers including this 1000w SEYAs unit. As an electrical engineer, I tested all three before connecting any devices to them. This SEYAS transformer was wired incorrectly: the input hot and neutral connections were reversed. Hot and neutral swap places at the exit when overtaking. Raising from 110V to 220V gives you 220V on two output lines, but each is 110V to ground, similar to a split-phase 220 in the US. To make matters worse, when you downshift from 220v to 110v you get 110v hot to ground and 110v hot. to the neutral wire, but the neutral wire is 220V to ground! It was trivial for me to swap the wiring and now it seems like a decent transformer for my purposes. However, I would not recommend anyone to buy this product (or any other cheap Revain transformer) unless you follow what I have outlined above and are familiar enough with a multimeter to test the transformer before use .
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