TEchnology
Grid Tied Roof Top Solar Power Generating Systems
In the grid interactive rooftop or small SPV systems, the DC power generated from SPV panels is converted to AC power using power conditioning unit and is fed to the grid.
The generated power during the daytime can be utilized fully by powering captive loads and excess power can be fed to the grid if grid is available. In cases where Solar Power is not sufficient due to cloud cover or during the night hours, the captive loads are served by drawing power from the grid. The grid interactive roof top solar system can work on a net metering basis wherein the beneficiary pays to the utility on net meter reading basis only.
The quantity of the Energy so generated by each individual household or industrial Building or commercial building or any other type of building can be used to partly fulfil the requirement of the building occupants and surplus, if any, can be fed into the grid. The distribution companies will allow power to feed into the grid and extend net metering facilities to the consumers.
Advantages:
- Utilization of vacant rooftop for own power generation.
- Can generate power for self-consumption and feed excess power to the Grid.
- Provision for settlement of registered surplus energy fed to the grid on a half yearly basis.
- Surplus energy injected shall be considered for payment by the DISCOM at pooled cost decided by the SEB.
- Generation of environmentally friendly green energy.
- Reduction in diesel consumption where DG back-up is provided.
- Capital subsidies from Govt. of India, where applicable.
- Accelerated Depreciation: For a Solar Plant operational for over 180 days in a fiscal year, it qualifies for a 40% depreciation in the first year, followed by an additional 20 percent. Solar Power Generators can consequently claim upto 60 percent depreciation in the initial year itself by the Industries and any other Commercial establishments.
Examples and ROI:
Domestic consumers by setting up a 3 Kwp Solar Power plant on their roof tops, the Return on Investment would be of the order of 3 to 3.2 years by availing the subsidy provided under PM Surya Ghar Scheme currently in operation. For Commercial and Industrial Consumers, the ROI would be of the order of 3 – 4 years depending on the capacity of the Installation.
C. Key Components of the Solar Power Generator. a. Solar PV Modules
a. Solar PV Modules
The proposed system is in series and parallel combination of multi crystalline silicon solar cells, individual SPV module rating is 600 Wp + modules to make up 108 KWp/200 KWp at Gunturu and Nizamabad respectively. The modules so selected are from reputed manufacturers that meet the stringent requirement as per IEC, UL and TUV standards.
b. On-Grid or Grid - Tie Solar Inverter
Solar On-grid string inverters with MPPT technology are qualified as per applicable national & international standards and the requirements of MNRE. The Solar Inverters, so selected are from reputed manufacturers that meet the stringent requirement as per IEC, UL and TUV standards.
C. Solar Hybrid Inverter:
Solar On-grid Hybrid Inverter with MPPT technology are qualified as per applicable national & international standards and the requirements of MNRE. The Solar Hybrid Inverters, so selected are from reputed manufacturers that meet the stringent requirement as per IEC, UL and TUV standards. Low maintenance, deep discharge batteries coupled with Solar Hybrid Inverters Store the energy generated through Solar and support the critical loads in the absence of the grid supply provided by SEB.