On Grid Solar PV System

Solar On-Grid rooftop system:

The On-grid system is connected with a utility grid (like BESCOM in Bangalore) and this system would work only if the grid is available. In case of a power cut, the system will not work and hence the On-grid system is also termed a Grid-tied system. A grid is required since the inverter needs to be provided a reference voltage and the inverter needs to sync with the grid in order to export energy back into the grid.

On-grid systems make sense for locations with no daytime power cut or with less than 2 hrs of a daytime power cut. This type of system is apt for reducing your electricity bills since it is cheaper than a battery-based system and there is no recurring cost of replacement of components.

Solar PV system generation

In general, solar peak generation is between 9:00 AM to 3:00 PM and is typically called the solar window. However, based on the type of system installed, surroundings, shadow, and all other design specifications, generation can be anywhere between 7:00 AM till 5:00 PM too.

Working On-Grid Solar PV System:

Once solar generation starts, the generated energy is first consumed by the loads. Once the load requirement is satisfied, the remaining energy will be exported to the grid. Grid by itself acts as a virtual battery taking in all the excess energy that has been exported. This is known as the banking of energy.

During the night, when there is no solar, the loads can import the banked energy. Similarly, when there is less generation from solar due to cloudy conditions, the required energy is imported from the grid. At the end of every billing cycle, the export and import billing will be calculated and this net will be calculated with the help of a Bi-directional meter.

Working of a Bi-directional meter

The difference between the traditional Unidirectional meter and the Bi-directional meter is that the unidirectional meter only displays the total energy imported from the grid. However, the Bi-directional meter records 3 readings – the total amount of energy Exported (in kWh), the total amount of energy Imported, and the Net energy difference between the export and import.

Know more about the 1-phase bi-directional meter and 3-phase bi-directional meter.

Types of On-Grid Solar PV systems

Solar technology in the rooftop sector has improved drastically over the past few years and has catered to the growing demands of the discerning public. There are many types of rooftops and each one of them has varying conditions like different roofs, different orientations, shadow issues, etc. Within on-grid solar PV systems, there are mainly three different types of systems:

  • String Inverter
  • Micro Inverter
  • Power Optimizers

General working of Solar On-Grid Solar PV System

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