What is Solar On Grid System ?
Updated: Dec 5, 2022
Solar On Grid system is a system that works on reference voltage alongside the grid. It means it will work only when grid power is available & there are no batteries involved in this system. Solar On Grid System is also known as Solar Grid Connected System or Solar On Grid Rooftop Power Plant.
It means: If grid is available than during day time, solar on grid system will sync with grid & will generate power to run loads connected to the building. In this case, initially the load will run on Solar power and balance on the grid. Let us understand with a pictorial photograph below:
Let us understand with an example: Consider a residence with a connected load of 15 KW and a solar power plant of 10 KW.
Case 1: During day time at at point of time, when grid is available, solar is generating 10 KW and running load is 15 KW, it means at that time, import from grid is only for 5 KW.
Case 2: During day time at at point of time, when grid is available, solar is generating 10 KW and running load is 10 KW, it means at that time, import from grid is Nil. Meter is not running.
Case 3: During day time at at point of time, when grid is available, solar is generating 10 KW and running load is 4 KW, it means at that time, import from grid is Nil. In this case, balance excess 6 KW is flowing back to the grid, which can be noted by local electricity department only when net metering is done.
This means that any excess or deficiency of power can be fed to the grid through net metering i.e. bi-directional meter which saves the record for both incoming & outgoing of power.
Today, many residential & industrial users are opting for an On-grid solar system as they get a chance to enjoy credit for the excess power their system produces and save on their electricity bills.
How solar on grid system works ?
On-grid solar systems produce power during the daytime. Without a backup power source, this power can either be used instantly or exported to the grid. At any time, the system draws power from the grid if it runs out of power. As a result, the user will never run out of power. Additionally, any excess energy produced by the system is fed into the grid.
With an on-grid system, the user will receive a credit for the extra power he sends to the grid in his electricity bill. As a result, his electricity bills will also be reduced. Before installing an on-grid solar system, always determine your home's energy consumption, solar potential, and solar electricity needs.
The sun's light falls on the solar panels, which generate electricity. Inverters convert DC from the sun into AC, which can then be used by consumers in their homes or businesses. Solar systems operate the same way up to this point. Beyond this point, there is a major difference. After we consume electricity, the extra energy generated can be used in two ways:
1. The solar energy can either be stored in batteries for later use (off-grid solar system) OR
2. Fed to the grid (on-grid solar system).
Key components of Solar On Grid System
1. Solar PV Modules - Solar PV Modules or Solar Panels are the main components of the Solar on-grid solar system. They comprise more than 55% of the total cost of a solar system and are used to capture solar energy and convert solar energy into electrical energy. This form of energy is in the form of DC Power.
2. Solar Inverter - Solar Inverters are brain & heart of Solar On grid system. They comprise only 20% of the total cost of a solar system but they play a vital role in system performance. They help in converting the DC power output produced from the solar panel into AC Power.
3. Solar Module Mounting Structure - Solar Module Mounting structure or Solar PV Panel stands are also a major component of the entire solar system. This stand will support the Solar PV Panels and if the stand is not sturdy than solar panels could just fall resulting in a heavy loss. It is the skeletal structure holding the panel in the proper position at proper angle. Right angle of inclination on which Solar PV Panels will be installed also result in higher power generation from same Solar On Grid System. These stands are generally made of aluminum or galvanized iron. Aluminum structure is generally used for industrial / tin shed but Galvanized Iron structure is used for RCC / concrete roof or Ground mounted application.
4. Wire & Cable - There are two types of Wire & Cable i.e. AC Cable & DC Cable. For interconnection in between Solar Panels and inverter, DC Cable should be used, whereas for connection in between Inverter to ACDB to LT Panel, AC Cable should be used. Selection of right size & make of Wire & Cable should be done considering long term system life.
5. DCDB & ACDB - DCDBs connect solar panels to inverters, while ACDBs distribute electricity from solar inverters to AC loads via an energy meter.
6. Earthing Kit - Earthing kits protect on-grid solar systems against thunder.
7. Lighting Arrestor - The Lightning Arrestor protects the on-grid solar system from lightning
8. Net Metering - Net meter is a bi-directional meter, which will be installed in place of existing single phase / three phase LT or HT meter installed at site. Net metering is possible depends upon individual state policy e.g. Haryana is offering Net metering for Solar On Grid System for capacity upto 500 KW and Maharashtra is offering Net metering for Solar On Grid System for capacity upto 1 MW.
Key Benefits of Solar On Grid System
Fast project Installation
Maintenance free solar system
ROI in 3-5 years, life 25-30 years.
No battery bank, no recurring cost.
Helps in Saving electricity bill up to 100%.
Utilities the 100% solar power produced by solar panel.
Lower system cost compare to battery based solar system.
No limitation of load, run all connected load with grid sharing.
Excess power produced by Solar System can be sent back to grid
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