A change to plate-freezing hours can be assessed only against actual tariff and consumption data. First protect the equipment's readiness time and dispatch schedule.

Put three records side by side

Mark bill tariff periods, freezer meter consumption and shift loading plans on one timeline. Record cycle duration for the actual load and operating conditions; do not assume a fixed time from a catalogue.

Make the trial comparable. When changing the schedule, note batch quantity and operating pattern. Compare energy, bill cost and plates ready at loading on similar days. A tariff benefit should not hide preparation delays or extra waiting.