ON-GRID SOLAR POWER SYSTEMS
A grid-connected photovoltaic power system, or grid-connected PV power system is an electricity generating solar PV power system that is connected to the utility grid
Net-Metering In this system, you have a single new bi-directional meter. When you consume electricity from the grid (or your electricity supply), the meter readings will move forward; but, when you produce electricity and send it to the grid, the meter readings shall move backward. Suppose you use 10 units of electricity in a day and produce 8 units, your meter will show a reading of 2 units. And if you use 10 units of electricity and produce 12 units, then your meter will show -2 units. Your bill at the end of month will be based on net units consumed/produced. If you generate extra electricity in any month, the surplus is carried over to the next month and netted. At the end of a year, if your total production is more that what you consumed, then you will get paid for the next surplus electricity produced at the cost decided by your state’s electricity regulatory commission.
GROSS METERING In this system, there are two meters: one measures your electricity consumption and the other measures your electricity production. Consequently, you get two different bills: one for consumption and other for production. There is no change in the way your consumption is billed (as it happens today), but you get paid separately for the electricity you produce. Again, the cost of electricity that you are paid is decided by the state’s electricity regulatory commission.
- Grid-connected PV systems are comparatively easier to install as they do not require a battery system.
- Grid interconnection of photovoltaic (PV) power generation systems has the advantage of effective utilization of generated power because there are no storage losses involved.
- A photovoltaic power system is carbon negative over its lifespan, as any energy produced over and above that to build the panel initially offsets the need for burning fossil fuels. Even though the sun doesn't always shine, any installation gives a reasonably predictable average reduction in carbon consumption.