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A solar PV power plant converts sunlight into electricity. It does so without any moving parts (unless it has a tracking system) and without generating either noise or pollution. A solar PV system can be installed at any un-shaded location such as on rooftops of buildings, car parking sheds, empty land, or even on top of canals and roads. Typical system sizes range from 240 watts to 100 MW. There is very little difference in the technical design between
small kW-sized plants (typically de-centralized, off-grid) and large, MW-sized plants (typically centralized, grid-connected). Solar plants can easily be scaled using independent, modular components such as PV modules, inverters and batteries. The rooftops of buildings would be ideal for the installation of solar PV in City A typical rooftop solar
PV system for a household is between 1-10kW. For larger buildings, such as offices or malls, it can reach 100 kW or more. Given Gujarat’s average irradiation of 5-5.5 kWh/m2/day, a kW of installed solar PV can generate 4-4.5 kWh of power during daylight hours, equivalent to the amount of power needed for a refrigerator to run for a day. A solar PV system consists of the following key components
The PV array consists of solar modules interconnected with each other. The modules convert the energy from unlight, are held on structures made of galvanized iron, mild steel or aluminum and are inclined at a horizontal tilt,
facing either south or east-west.
Types of rooftop solar PV systems
Rooftop solar PV systems are of 3 types:
The difference between the systems lies in the kind of inverter used, and the inclusion of batteries. As various vendors use different terminology for these systems we urge you to verify the functions of the offered system rather than going by the name alone
A rooftop solar PV system costs approximately Rs. 1,00,000 per kWp (kilowatt peak) including installation charges but without batteries and without considering incentives
Rooftop and high efficiency solar modules
High efficiency solar panels are coming in to their own at the moment. Many of the most efficient solar modules have a copper foundation, which makes them especially resistant to corrosion. Solar cell manufacturers are also swapping the weak connections in their cells with sturdier, thicker connectors. In the past, with these weak connections, if just one connection failed then that would mean that the whole cell was out of action. Present day solar cell connectors are much more resistant to failure, and also the loss of one connector does not have such a drastic effect on the rest of the cell. These new connectors are also designed to expand and contract in line with changes in temperature and sunlight levels throughout the day.
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