My espresso machine is: 220-240V~50 Hz, it is having internal pump and grinder, my home AC is 220V~60 Hz, can I operate it with APC 1500V: 980W with an output of: 220-240~50/60 Hz instead of connecting it directly to the wall to avoid damaging its internal system over time. The concept is just to use the APC unit as an inverter for Hz only.
To the best of my knowledge, no 1500VA or smaller APC Back-UPS or Smart-UPS model has the ability to perform frequency conversion when operating from the AC line. (I am not sure about the "on line" APC UPS products. I've never seen one.)
Before we even get to that point, though, the APC UPS would already be majorly overloaded even when running on normal AC utility power. You could exceed the safe operating limits of its internal wiring and other circuits.
Operating your espresso machine on 60 Hz power is really rather unlikely to harm it. Anything that uses the line frequency as a timing reference will run slightly faster than normal.
You would probably be better off replacing the espresso machine if something about it does require a 50 Hz line frequency. Any kind of frequency converter with sufficient capacity to run your machine properly will not be cheap.
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