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An electricity meter is a device that measures electricity consumption in a household, building or facility. In a photovoltaic system, an electricity meter is used to measure the flow of electricity from the system to the grid and to manage the electricity generated. There are different types of electricity meters, including electronic and digital meters, which allow more accurate measurements and better monitoring. By accurately monitoring the power consumption of your PV system, you can ensure that you are maximising the output of your system and improving its efficiency.