Powermeter won't send power if it doesn't think it's moving - no cadence=no power.
Otherwise it'd display 300 watts whilst trackstanding, as there is torque (aka weight) on the pedal.
Building on this however...could it be some weirdness caused by using a GSC10 speed / cadence sensor?
I'm not using the gsc10 cadence magnet, so it won't be reporting cadence as far as I know.
@Dammit started
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Powermeter won't send power if it doesn't think it's moving - no cadence=no power.
Otherwise it'd display 300 watts whilst trackstanding, as there is torque (aka weight) on the pedal.