Solar Homes

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The system cost for about 1KWP is about Rs 1.4 lacs. This varies according to the state you live in as the solar constant varies from state to state.

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What you need: Roof or open space of about 100 to 120 square feet to place the panels on metal frames.

How much power can it produce? About eight points of light loads such as lights and fans, including a television, but not air-conditioners.

What are the components of the system? Solar photovoltaic panels on the roof, an inverter that supports 3KW, suitable battery for solar charging. A solar battery costs about Rs. 11,000.

How long will the system work? The manufacturers warranty the panels for five years, and their life is estimated to be at least twenty five years, with a power production ability of 85 per cent from the 20th year, output being higher in the earlier period.

Is there a subsidy? The Centre provides a 30 per cent subsidy through the manufacturer, while Tamil Nadu has announced a 20 per cent subsidy over that.

How much does it cost? The range for a 1 KW system quoted at the expo by various solutions providers is between Rs. 1.20 lakhs to Rs. 1.8 lakhs.

Small solar systems of Rs. 45,000 promise to run three lights, a couple of fans and a TV. Newer products in the sub Rs.25,000 range and an intermediate system at Rs. 75,000 are soon to be announced.