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I think using p= IxV is correct and you'd have to hope you didn't blow the hub when drawing the required amps.
I made up a dew strip by stripping down a hair drier and slipping the required length of straightened resistance wire into some silicon sheathing.
I wrapped that round the end of the ota and that was it. I fed it from a 12v deep cycle battery. It only took an amp.
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