But, nothing changes the fact that 1VA = 1 watt. So if the OP is using a 1000 watts step down, he is using a 1 kVA step down. Cheers
1VA is not equal to 1Watt in this case since the load is not resistive.
Citing your example, if the OP is using a 1000VA step down and assuming the PF of the receiver is 0.85 (just an arbitrary number below the ideal value of 1), the transformer will be capable of providing only VA x PF = 1000 x 0.85 = 850Watts and not 1000W.
You may recollect the same number jugglery used to manufacturers advantage in case of rating UPS's, Stabilizers...
Likewise a 500VA UPS can never support a PC drawing 500Watts of actual power since the PF of the PC SMPS is never unity.
Side Note: Active PFC (Power factor correction) is used in good SMPS's but it can only make the PF closer to unity(Ex:0.98) but never exactly unity but that's the subject of another discussion.
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