dc input power measurement of inverter

what is the accurate method for measuring dc input power of a square wave inverter,with variable duty cycle?how does the current fed back to battery(through reverse diodes of mosfets) when the two mosfets are OFF is accounted(considering push-pull operation). Will the RMS power be equal to the average power if we consider near

50% operation? there is no active clamp circuit and consider 50hz operation(no hf dc-dc link) with iron core transformer
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