Henry Dover answers:

Annual insolation

With about 200 clear sunny days in a year, India’s theoretical solar power reception, just on its land area, is about 5 EWh/year (i.e. = 5000 trillion kWh/yr ~ 600 TW).[1] [2] The daily average solar energy incident over India varies from 4 to 7 kWh/m2 with about 2300 – 3200 sunshine hours per year, depending upon location.[1] This is far more than current total energy consumption. For example, even assuming 10% conversion efficiency for PV modules, it will still be thousand times greater than the likely electricity demand in India by the year 2015. [1]

[edit] Present Status

[edit] Installed capacity

The amount of solar energy produced in India is merely 0.5 % compared to other energy resources.[3] The Grid-interactive solar power as on Jun, 2007 was merely 2.12 MW.[4] Government-funded solar energy in India only accounted for approximately 6.4 megawatt-years of power as of 2005.[3]

[edit] Still unaffordable

Solar power is currently prohibitive due to high initial costs of deployment. For spawning a thriving solar market, the technology needs to be competitively cheaper – i.e. Attaining cost parity with fossil or nuclear energy. India is heavily dependent on coal and foreign oil – a phenomenon likely to continue until non-fossil / renewable energy technology become economically viable in the country. [5] [6] The cost of production ranges from Rs 15 to Rs 30 per unit compared to around Rs 2 to Rs 6 per unit for conventional thermal energy. [7]

[edit] Government policy

The Ministry of New and Renewable Energy (MNRE) [8] have initiated schemes and incentives – like subsidy, soft loan, confessional duty on raw material imports, excise duty exemption on certain devices/systems etc – to boost the production and use of solar energy systems. The Indian Renewable Energy Development Agency (IREDA) [9] provides revolving fund to financing and leasing companies offering affordable credit for the purchase of PV systems. An Expert Committee constituted by the Planning Commission has prepared an Integrated Energy Policy which envisions a 10 million square meter solar collector area, to be set up by 2022, and capable of conserving electricity equivalent to that generated from a 500 MW power plant.[3] The state of West Bengal has intitiated to make the use of solar power mandatory in new multi-storeyed buildings.[10] However the Indian government support is insignificant compared to the support solar enery receives by governments in Europe and East Asia.

[edit] Solar Funds and Investments

With high deployment price as the main hurdle before a solar market, various organisations have developed innovative funding schemes to catalyse solar’s attractiveness. [11] [12] One of the most successful example is the solar loan programme in India, sponsored by UNEP [11] in partnership with two of India’s major banking groups – Canara Bank and Syndicate Bank, and their sponsored Grameen Banks. It was a four-year $7.6 million effort, launched in April 2003 to help accelerate the market for financing solar home systems in southern India. Foreign Direct Investment up to 100 percent is permitted in non-conventional energy sector through the automatic route. The Multilateral Development Banks like World Bank and Asian Development Bank are also helping India but, the funding from MDBs on solar energy enhancement is negligible compare to other clean energy support in India.[3] Investment by private companies is a trend that has just started. [7] (Examples include Signet Solar, U.S.-based Cypress Semiconductor, SunTechnics Energy, etc.)

[edit] Thar desert

In 1996 Amoco/Enron Solar Power Development planned to build a 50 MW solar photovoltaic plant in the Thar desert near Jaisalmer in Rajasthan state.[13] Two other projects were proposed, one a 50 MW photovoltaics plant and the other a 200 MW solar chimney. None of these have been completed. The Rajashtan government, however, has set aside a 35,000 km² area of the Thar desert for solar power.[14]

[edit] PV manufacture in India

Current PV manufacturing in India includes:

* BP-Tata joint venture [15]
* Moser-Baer signed up for a thin film Si plant provided by Applied Materials [16]
* Solar Semiconductor Pvt in Hyderabad, AP [17]

[edit] Solar engineering training

The Australian government has awarded UNSW A$5.2 million to train next-generation solar energy engineers from Asia-Pacific nations, specifically India and China, as part of the Asia-Pacific Partnership on Clean Development and Climate (APP).[18] Certain programmes are designed to target for rural solar usage development. [19]

[edit] Applications

[edit] Rural electrification

Lack of electricity infrastructure is one of the main hurdles in the development of rural India. India’s grid system is considerably under-developed, with major sections of its populace still surviving off-grid. As on 2004 there are about 80,000 unelectrified villages in the country. Of these villages, 18,000 could not be electrified through extension of the conventional grid. A target for electrifying 5000 such villages was fixed for the Tenth National Five Year Plan (2002-2007). As on 2004, more than 2700 villages and hamlets had been electrified mainly using SPV systems.[1] Developments on cheap solar technology is considered as a potential alternative that allows an electricity infrastructure comprising of a network of local-grid clusters with distributed electricity generation.[3] That could allow bypassing, or at least relieving the need of installing expensive, and lossy, long-distance centralised power delivery systems and yet bring cheap electricity to the masses.

[edit] Agricultural support

[edit] Water pumping

Solar PV water pumping systems are used for irrigation and drinking water. The majority of the pumps are fitted with a 200 watt – 3,000 watt motor that are powered with 1,800 Wp PV array which can deliver about 140,000 liters of water/day from a total head of 10 meters. By 30th September, 2006, a total of 7,068 solar PV water pumping systems have been installed. [3]

[edit] Harvest processing

Solar driers are used to dry harvests before storage. [20]

[edit] Cooling

Another e.g. Is the cost of energy expended on temperature control – a factor squarely influencing regional energy intensity. With cooling load demands being roughly in phase with the sun’s intensity, cooling from intense solar radiation could be an attractive energy-economic option in the subcontinent. [21] [22] [23]

[edit] Challenges and Constraints

[edit] Land scarcity

Per capita land availabiity is a scarce resource in India. Dedication of land area for exclusive installation of solar cells might have to compete with other necessities that require land. The amount of land required for utility-scale solar power plants – currently approximately 1 sq km for every 20-60 megawatts (MW) generated [3] – could pose a strain on India’s available land resource. The architecture more suitable for most of India would be a highly distributed, individual rooftop power generation systems, all connected via a local grid. [3] However, erecting such an infrastructure – which doesn’t enjoy the economies of scale possible in mass utility-scale solar panel deployment – needs the market price of solar technology deployment to substantially decline so that it attracts the individual and average family size household consumer. That might be possible in the future, since PV is projected to continue its current cost reductions for the next decades and be able to compete with fossil fuel.[1]

[edit] Slow progress

While the world has progressed substantially in production of basic silicon mono-crystalline photovoltaic cells, India has fallen short to achieve the worldwide momentum. India has now on the 7th place worldwide in Solar Photovoltaic (PV) Cell production and 9th place in Solar Thermal Systems with nations like Japan, Europe, China, and the US currently ranked far ahead. Globally, solar is the fastest growing source of energy (though from a small base) with an annual average growth of 35%, as seen during the past few years.[24]

[edit] Latent potential

Major think-tanks have designed blueprints for India’s transition to renewable energy – that rein on its carbon emissions, without compromising its economic growth. [1] [25] [26] For example, in one of the envisioned scenarios, renewable resources like solar could become the backbone of India’s economy by 2050.[26] Being a densely populated region [27] in the sunny tropical belt,[28] India’s very long-term solar potential has been observed to be unparalleled in the world, since the subcontinent has the ideal combination of both high solar insolation [28] and a big potential consumer base density.[

Henry Dover answers:

To figure our how many you need, take a look at your power bill. It will tell you how many kilowatt/hours you used during the month. My bill says I use about 2000 kilowatt/hours per month, or about 2000 kwh /30 days=67 kw/h hours per day. That is 67,000 watt hours. To supply that with solar panels, you have to generate at least 67,000 watt hours, but you don’t have a full day to do it, since you have to do it while the sun is up. So you put the energy into batteries during the day, so you can use it at night.

A 125 watt panel generates about 125 watts when fully illuminated by the sun. If you fully illuminate it for an hour, you get 125 watt hours. If you get 12 hours of sunlight a day, that would seem to imply that I need 67000 watt hours/125 watts /12 hours=45 panels.

But for most of the day, the sun isn’t hitting the panel fully, so it isn’t going to generate the full 125 watts. When the sun is 45 degrees to the side, you only get about 70%. When the sun is 60 deg to the side, you only get 50%. And what do you do on cloudy days? And the shorter days in the winter? To make up for this, you have to increase the number of panels to make up for the loss. So in reality, I might need double this number of panels, for realiable solar power throughout the year. That works out to about 90 panels, or 11,250 watts worth for my house.

Henry Dover answers:

No it can’t be done.

Henry Dover answers:

How cheap can you make Solar power Generation.

Your question is upside down.

Why should anyone use Solar power, it is too expensive. If the cost of Solar power reduces, then the uptake will increase. Only when it is worth the cost will Solar power be used.

Henry Dover answers:

Are you extremely rich solar is bunk and requires massive amounts of square footage not to mention the batteries. Great dream though! Nuclear is the cleanest and most productive source we have for some time to come!