There are 3 types of Solar PV Power System depending upon their connections:

• ON Grid – In this type the system is connected to the Grid. The generated power is used by appliances load in the building (Captive Load) and any extra Power is sent to the Grid. This system is most common in areas with good power Supply availability.
• Off Grid – In this system the batteries are used for storage. The power generated from the Solar panels is stored in the battery and used when required.
• Hybrid System – This type of system is connected to the Grid and also uses battery for storage. This system is common in areas where Power supply is available but with frequent failures and long duration outages.

Net metering is a concept under which any extra power produced by the Solar Panels is sent back to the grid and it is offset against the power used from the Grid. The billing of the user is done based on Net of units imported from Grid and exported to Grid.

The inverter provides information about how much Solar Power Units are generated by the system. It is also possible to remotely monitor the power generation in latest inverters.

Solar Panels (generates Power), Inverters (Converts DC power to AC power), Module Mounting Structure (For installation of Panels), Batteries (for OFF Grid and hybrid Systems) Earthing, Lightening Arrestor, Cables and accessories are the main components of the Solar PV Power Plant System.

Mainly there are 2 types of panels Polycrystalline and Monocrystalline. Monocrystalline panels are made from single continuous crystal whereas Polycrystalline are made of a mixture of silicon crystal. Normally Mono are more efficient than Polycrystalline especially in low light conditions and they also have higher capacity for same size of Panel. Monocrystalline are also 10-15% more expensive than Polycrystalline Panels. Currently Polycrystalline Panels have a much higher market share in the Residential and smaller sized projects. There are also thin wafer Amorphous Panels which are used for specific purposes.

There is a subsidy of 30% from the Central Government for Residential, private schools, hospitals and institutes.

Commercial buildings, businesses and Industries can claim accelerated depreciation as a benefit for going Solar.

ROI (Return on Investment) measures the gain or loss generated on an investment relative to the amount of money invested. ROI is usually expressed as a percentage and is typically used for personal financial decisions, to compare a company's profitability or to compare the efficiency of different investments.

The Solar Power Systems can be installed in CAPEX or OPEX model. In CAPEX model the system is owned by the customer. The Customer is also responsible for basic system maintenance. This model is common for smaller size systems.

In OPEX/RESCO model the entire system is owned by the Developer and the customers pays for the energy used based on pre agreed tariff model. These agreements are for a long period of time and this model is more common for bigger size projects.

Normally the ROI of the investments considering the subsidy is around 4-5 years which depends upon the local EB rates, State Government Subsidies and the system cost. Many States are also providing credits for the units generated by the plant which expedites the ROI.

The system installation for a Residential Rooftop system shall take around 7days time. Getting the full system operational and connected to Grid can depend on some external factors like Netmeter approval and connecting of system to Netmeter.

Typically 1 KW system requires around 10 sqm or 110 sqft of shadow free space for Installation.

The Installation requires fixing the structure to the Roof which requires small amount of Civil Work. Except the Civil work and Earthing the process is noise less. The civil work can take up around 2 days of time.

The shade on the panel, Direction and tilt of the panels (Should be facing in South), Cleanliness of the Panels are the few important factors which can affect the Power Generation.

We can install Elevated Structure on the roof in which the customer can walk below the Solar Panels. The Elevated Structure costs a bit more and the Tilt angle is reduced but it allows the usage of roof and can also provide heat protection to Room below and water Tanks.

The Panels and Structure can be dismantled and installed again on the new floor. You will only need some space to store them while work in ongoing.

There are customized designs which will allow you to continue using your roof.

There are different types of Loans and Financing available to reduce the impact of 1 time payment. Considering the ROI (Return on Investments) of 4-5 years for domestic projects, the positive impact on environment and inflation free power for over 25 years its worthwhile to make this investment.

The system requires very less maintenance. Basically the Panels should be kept clean from Dust by periodic washing to have high efficiency output.

With Net metering concept any extra power generated by the Solar Power System shall be sent to the Grid and it will offset any power taken from grid in the evening. The accounting cycle is done monthly and final settlement is done at end of financial year.