Yes but the initial firmware was drawing around 550 watts at the wall, so you have an entire 300 watts grace.
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Fair enough.

What does this version .98.1 cause the unit to draw?

Have you measured or are you guessing? That's all I want to know.

Edit: Another point -- the large units have more capacity (pun intended) to handle "dropouts" of a part cycle. The more expensive higher capacity units also tend to have better characteristics for filtering out spikes.