I believe that in general the optimum VAC is 120 vac here in the good old U.S,A. The accepted variance would be plus or minus 10%. 108 vac minimum, 132 vac maximum. Voltages will vary under load.
However each of the appliances (refrigerator, air conditioner, microwave, heater. etc.) all have listed perimeters of operation. Check each to verify what voltages will be safe for your application.
Anything with an electric motor will suffer and potentially reducing the lifespan of that motor, i.e. Referigerators, air-conditioners.
-Dennis
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