Which groups do I keep always on in the meter cabinet?

Of the four circuits that the metering module controls, you may switch off three once the guest's credit runs out. One circuit remains always on, typically with the refrigerator, freezer, wifi router and any emergency lighting connected to it, supplemented with property-specific equipment such as an aquarium pump or boiler. Heating and air conditioning should be on a switched circuit instead, as that is consumption the guest pays for. Which appliances go on which circuit exactly is determined once by you together with the installer, depending on the layout of the property.