An electricity bill does not isolate freezer use by itself. Energy per cycle needs a measurement for the freezer and a clearly defined cycle denominator for the same period.
Set the measurement source
Take kWh from a meter or sub-meter dedicated to the freezer. If the meter is shared, do not assign the whole bill to the freezer without a validated way to measure its use.
Define the denominator
Define a cycle as one completed plate-preparation batch and keep that counting rule across periods. The energy numerator must cover the same start and end dates.
Calculation
Measured freezer kWh ÷ completed preparation batches = kWh per batch. For cost, calculate the relevant period's charge over that same denominator separately.
Separate tariff effects
If the bill changes but kWh per cycle does not, review tariff or billing-period effects. With time-of-use pricing, record which tariff bands overlap the measurement period.
State the denominator's limits
If melting-point groups differ, keep cycle counts separate by group. A total kWh measurement does not make them one use group; if energy is allocated, state the measurement method and assumptions.
Dividing a bill by cycle count does not replace measured energy use.
Make a comparable decision. Compare months using the same freezer, measurement method, period length and cycle definition. Do not treat a unit change alone as proof of a fault or inefficiency; first verify the measurement and activity scope.
Add load and run context
Record the plate group and plates per batch alongside the result. Batch size may change even if cycle count is stable; these fields help interpret the comparison.
