“What is the reason for the large difference between the Volt -ampere (VA) rating and the Wattage? 900 watts from a 1500 VA device assumes a power factor of only 0.6. This p.f. seems low for typical household equipment.”
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You are right, this power factor is lower than the p.f. for typical household equipment. I am not sure why, but I think that it is related to the fact that the power is received through a battery. Apparently the chemical interaction brings about some power loss.
Sorry, there was a problem. Please try again later.As, electrically "Watts equals Volts times Amps", I would guess that one of these numbers is the power output (from the battery) while the other is the power input (amount of power used to charge the battery); could be that the difference (600 VA / watts) Is dedicated to keeping the battery charged. This particular model has a display that can be set to show how long the battery will last - based on the "load" currently being drawn by what is plugged into the unit; very useful for estimating current power loads of "energy saving devices" - that usually do NOT draw the full amount of their rated loads.
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