Gross metering is a type of metering for grid-connected systems.
The total production of the PV array is metered and then fed directly into the grid. On-site loads are fed by consuming power directly from the grid. The installation includes two meters: one meter to measure the power generated by the PV system and sold to the grid, and one meter to measure power consumed from the grid. The system owner receives a payment (or a credit) for the PV power generated and a normal bill for the grid electricity consumed.
Meters for gross metering. There are two meters. All the electricity produced by the PV modules is exported. Other configurations are possible.
The payment rate (called a feed-in tariff or FiT) per kWh sold needs to be higher than the cost of consuming a kWh from the grid in order for the system to be attractive to the system owner. If the cost of consuming a kWh were higher than the feed-in tariff per kWh, it would make more sense to directly use the electricity generated and save on the electricity bill.