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The biggest complaint we hear from homeowners who are considering rooftop solar systems is the lack of information: How much will it cost; how long until it pays off; who’s the best local installer? A new site that launched this morning, is looking to help answer all of those queries using satellite data and a hands-on web site — RoofRay.com.

Here’s how it works: enter an address, pull up the satellite image of the chosen building’s rooftop and then using the RoofRay tool based on Google maps, draw your solar arrays (see image below and YouTube video below the jump). Data on square footage of the system, slope of the roof, power per square foot and total peak power all show up in a chart, and the info displayed depends on how big you’ve drawn your system.

The project, tagged as one of the largest foreign direct investment (FDI) into the state, will also be a landmark project as the cost of power generation is likely to be 70 per cent less — around Rs 20,000 crore — than the conventional cost of generation, say sources close to the development.

 

The project envisages an integrated solar city wherein all the raw materials including glass and panels will be produced by them, bringing down the cost substantially, said a senior government official.

 

The cost of generation for thermal energy is about Rs 10-11 per unit. However, according to estimates of Clinton Foundation, the power produced in the solar city will cost around Rs 4 per unit, going by the scale of the project and technology advancement they have on hand.

The advanced industrialized economies were lucky to have had their development fuelled by cheap fossil energy. Today’s developing economies have a much tougher challenge. It was a very short window of opportunity which opened just about 150 years ago and is likely to close in the next 40 years, by when the known reserves will be depleted at current levels of consumption.

 

All told, 200 years is a very brief interlude considering thousands of years of human civilization and hopefully hundreds of thousands of years yet to come. At some time in the distant future, they will look back and remark that the age of fossil fuel was a short inflection point, a point at which humanity passed through the bottleneck of dependency on oil from the ground. Before that point, humanity’s primary source of energy was the sun, and so it will be after that point.

A new era for solar power is approaching. Long derided as uneconomic, it is gaining ground as technologies improve and the cost of traditional energy sources rises. Within three to seven years, unsubsidized solar power could cost no more to end customers in many markets, such as California and Italy, than electricity generated by fossil fuels or by renewable alternatives to solar. By 2020, global installed solar capacity could be 20 to 40 times its level today.

Solar insolation is the rate of solar radiation (kilowatt-hours per square meter) over an area.The world map shows the amount of solar energy in hours, received each day on an optimally tilted surface during the worst month of the year. This is used as an indicator of solar energy potential.