Solar On-Grid -

Shaping the Future with Sustainable Power

On Grid Solar System

Overview

Grid-Tie RTS Solutions

When sunlight falls on the photovoltaic (PV) solar panels, DC electricity is generated. DC is then converted into AC by the solar inverter. The on-grid rooftop solar system (also known as grid-tie) is connected to the main utility power lines (KEB grid) and produces electricity during the day when grid is up.

This power is available for instant use OR exported to the grid, if unused. If at any time due to low sunlight, if system doesn’t generate enough power, it draws the power from the grid to make up the shortfall. Surplus power generated from panels that is not used is fed into the grid.

The bidirectional meters measure the solar generated electricity going into grid AND units drawn from the grid. At the end of each month, they are reconciled. The ‘net-consumption-units’ arrived at, are charged at grid tariff.

For the surplus ‘net-units-exported-to-grid’ CESCOM pays the consumer as per buy-back tariff agreed in the Power Purchase Agreement (PPA) valid for 25 years.

Many are opting for on-grid system as they get a credit for the excess power generated and save on their monthly electricity bills by captive consumption of solar power during the day.

Based on sun irradiance in the state, the guidance on power production is ~4Units/Day/KW of panels. It may generate above 5Units/Day during summer and below 4Units/day during rainy/winter season. 4Units/ KW/ Day on an average is a yardstick to measure RTS performance.

The basic premise of grid-tied system is to connect to both the grid and panels so that power from either OR both can be drawn for use.

Capitalize by exporting the surplus solar power back to grid and get paid every month

The key objective of on-grid solutions is to achieve sustained cost savings for 25 years

Advantages

Achieve long term savings on energy bills. Higher the captive consumption of solar power, more is the savings as grid-tariff is bound to increase in future.
Surplus power exported to grid will get additional revenue to offset the fixed demand charges and thereby helps to achieve zero monthly bills.
Less expensive compared to off-grid and solar hybrid systems. Lower upfront cost, since battery storage is not needed.
Good choice in urban areas with a reliable grid.
Only on-grid systems can get subsidy for residential customers.

Disadvantages

Doesn’t prevent power outages, as it relies on the grid for reference. If grid is down, RTS is also down.
As per design, as a safety measure, on-grid systems do NOT generate power when grid power is down. This is to avoid accidents from RTS system exporting power to grid while grid maintenance is going on.
On-grid systems DO NOT have batteries for power storage. They don’t function as UPS.
On-grid systems will NOT generate power efficiently during cloudy and rainy days and during night.

What components On-grid Solar installation has ?

Among RTS solutions, on-grid systems require minimal number of components. Hence, they are least expensive. Grid-tie systems have:
Standard solar equipment like PV panels, mounting structures and connectors.
Grid-tie inverters, either string inverters OR microinverter(for each panel).
Bidirectional electric meter to track electricity generated, exported to grid and power imported from grid.
Other standard BOS components like AC/DC connectors/safety disconnects, MCB etc.

Choose a Right Installer/EPC Vendor

Grid-tie RTS solutions not only requires good photovoltaic design understanding but also good knowledge of grid LT/HT electrical fundamentals. Knowledge on KEB/KREDL/Govt agencies’ procedural formalities for sanctions/approvals/policies is essential to guide customers w.r.t taking up right decision. Go with an EPC vendor who is knowledgeable, provides the un-biased value-for-money solution to meet your exact requirements and NOT force-fit any standard solution to you. Look for value-added services vendor offers, like liaison support with CESCOM /OEMs/Banks and NBFCs etc. so that going solar is made easy for you.

Get Ready to Save the Environment and your Energy Bills !!

Get in touch with us and we will be very happy to study your requirement and come up with cost effective Energy saving solutions, that are both environment friendly and budget conscious.

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