Why 108 Volts for Watts Ratings?
The specs for various brand converters use 108 volts for their input ratings. If a converter is rated as having a max input draw of 15 amps at 108v, for 1620w, what would be its draw using a Honda ...
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2oldman wrote:JesLookin wrote:That's the obvious answer, but OP must be getting at something else.
1620 watts / 124 volts = 13.06 amps
for a pure resistive load yes. but not much is a pure resistive load. your toaster, your water heater element etc.
But NOT your ac unit, your microwave, your converter. For them watts may go up, may go down,may stay the same. It all depends on what kind of switch supply is used and what kind of load the supply is hooked to.
it all goes back to UL and NEC and the 120V "nominal" input that basically expects those devices to operate from 108V to around 130.
in many cases max current is at min voltage for reactive load devices. and induction motors also draw higher current as the input voltage goes down partially due to the reduced back emf generated by the motor.
