[QUOTE=rickst29;157446]
[T]he AC waveform generation gets done and provided at the outputs. All the control circuits are active.[QUOTE]
In addition to Rick's points, all inverters start by generating a stairstep approximation to a sine wave. The more stairsteps, the closer the approximation, but don’t let the hype about “pure sine wave” fool you - it isn’t quite true. There are still steps. Then at the output, there is a filter circuit that smooths the steps by passing the current associated with their edges directly from the hot side to the ground side. This “edge current” is wasted, but it gets the approximation still closer to “pure”. And the filtering happens even when there is no load on the inverter output. I would bet that this “edge current” is part of the static load.
Engineers and audiophiles will recognize the term “harmonic distortion”.
Bill
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