Creating A Virtual Channel Using Time Offset Arrays

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I'm sampling a solar installation inverter where one of the channels is the cumulative kWh energy production.  This register is updated approx every 5 minutes by the inverter  and I'm trying to create a virtual channel to show the delta kW every five minutes produced but I't not generating an array.

I created a virtual channel with expression = (power[0]-power[4]) where the power[] table is created by sampling the inverter kWH channel every minute.....but this expression only generates a single value rather than creating a timed value array

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