110V 800W coffee machine should use 220V, what, how many watts of transformers?
About 60 hertz and 50 hertz, this does not have much influence, can not consider,The main thing is power, your machine's original power is 800 watts, this will not change, or 800 watts.You just need a 220 volt transformer into 110 volts, the power transformer should be 900 to 1000 watts can, should not choose too large, it will increase the loss, no less than 800 watts, this transformer may have a fever, a long time may damage,
5A1000 watt transformer, than the power of the machine larger, 220 change 110V
(240-110) /220 = 50%, usually with 5 to 10% voltage tolerance, obviously this difference is too large.What you need is an AC converter for 220V to 110V. The effective power of the converter is usually between 70%-80% of the nominal power, that is, if the total power of your coffee maker is 800W, then 800/70%=1142W or 800X1.414=1131 W is selected.
