Projects for states are to be prepared based on matrices of the state. As for power generation planning can be based on 'energy deficit'. Planning should aim energy security. Kerala’s annual energy deficit is 10000 MU. This much energy has to be generated in due course, may be in 10 - 20 years from solar source. I feel grid connected rooftop solar plant is the right solution for Kerala. I assessed the rooftop potential of Kerala as 10000 MW at the present efficiency of 16.5%. This potential could go up as efficiency of solar module increases which is sure to come. Government of Kerala is in the process of finalizing Solar Policy.

Promote solar: It is not advisable to depend on depleting resources. This is the case for all fossil fuels and Uranium. Potential of every renewable resource is to be assessed and decide the road map. It could be seen that wind and solar own the larger share. It has been postulated by scientists, that renewables can meet India's energy needs. Comparing the potential I find that solar is the best choice for India. Almost all nations do turn to solar for their energy needs. France derives over 75% of its electricity from nuclear energy. Now they are moving towards solar for their energy needs. Let India also move towards solar for energy needs. We can not switch over to solar overnight. It took Germany 15 years to attain exponential growth of solar harvesting. Reason for their fast growth is due to the simple technology and method they applied for solar harvesting (SPV)

Grid Connected industry roof top solar PV system (or in some special cases Off Grid) must be made mandatory with necessary design validation, net metering due to falling PV prices. This will reduce the transmission losses and release the grid power to other places during the day time. Net metering shall be necessary with smart metering for the transparency. Japan is already ahead of us in using the Industry roof top solar PV system, so, why not in INDIA and why extract more money from Poor rural people, in the name of Remote area etc, instead have a holistic approach and them provide them low cost energy with Mini Grid, which shall in turn get hooked up to main grid in the decade to come (due to fund restrictions or time for implementation of new lines etc)

Note that 80% of solar generation in Germany is from Rooftop plants. India should take advantage of number of residences/commercial buildings in the country. Provide a conducive atmosphere for the growth of solar harvesting. As such the terms and conditions of loan tenure etc is to be moderated to the advantage of small producers-residential rooftop solar power producers.

It is suggested that the policy should encourage intelligent entrepreneurs to come out with various business models in line with the Law of the Land. Once the policy is adopted the government should sit back and watch CAREFULLY the progress or regress of the programme that is versioned in the policy and to get involved, if necessary, for corrections.

Our coal reserve as on April 2012 is 114 Billion tons. India's annual coal consumption is 600 Million average. Coal consumption doubles (approx) in every ten years because of growth in installed capacity. We can imagine the crisis waiting after say about 30 years from now. Shortage of coal will create chaos in power sector. Importing coal from abroad is not recommended as the cost of coal from abroad will be costly. THEY decide price according to the market vagaries and political compulsions. I see, India's choice for energy is solar source. Let us think deeper to find way outs to harvest solar energy in a big way. Our present share is just 1000 MW plus out of world solar capacity of 102000 MW. We need not do much research for fast progress. There are success stories of various countries. Just learn from them and adopt it with modifications to suit Indian conditions.

The platform is set for roof PV take off. The only thing needed is bringing down the cost which seems to be on cards in near future. Actually in a country like India...stand alone decentralized power generation and distribution is more required. Solar PV suits this parameter. I pay the utility in the State of Madhya Pradesh about Rs. 6.50/Kwh as tariff (tariff based on the consumption slab). Now if the cost of power generated from solar PV system (solar panel+ battery + inverter etc.) can come down to this level there should not be a problem. In Tamil Nadu the grid connected solar PV tariff (without battery etc). has already been offered at Rs. 5.93 / Kwh.

"Net Energy Metering" allows electric meters to spin backward when customers produce more energy than their home or business is using at that moment. It also allows customers to essentially use the electric grid as a battery for free, storing excess energy they don't need now to offset their usage at other times when they draw power from the grid. Some customers have even produced more energy in a year than they use, and net metering provides for financial payments for that.

The intentions are there, people try to get a good branded product but none is available. To fill in the gap, local technicians create a jugged of low cost solar panels, Diode as an excuse for a charger, wet type batteries that leak and create a mess, non sine wave inverters that buzz and lead to damaged electronics. This whole thing works for a few months before one thing or the other giving up.

If a packaged solution is proposed, there are takers. They do not mind the minimal maintenance of cleaning panels. Use of maintenance free batteries is mandatory for home use to avoid the mess and hazard of acid leaking.

It is a myth that technology is useful only for the well endowed and prosperous. Consider the deft use of your computers and smart phones by small kids in your families who are in school and hardly get some pocket money. Also consider the Dhaba walla who runs his jazzy lights on a Battery. Yes the well endowed is more likely to invest in a traditional system but the other two are more likely to find newer applications.

Let an application be put on solar - with or without batteries, with or without inverters. Let the architect, developer, lighting consultant and any other relevant person discuss it thread bare. This will make all the guys stakeholders.

All said and done, the solar actors and the players have to live up to another challenge: The conversion efficiency of solar modules and inverters has been stagnant for, at least, two decades. We have to pull up our sleeves to increase the power generation from 1.6 million units/MW to, at least, 2 million units/MW whether at the module level or in the system integration level (by increasing the system efficiency through maximum power transfer theorem and so on. I believe it's possible to work on capitalizing on reducing the impedances at various levels).

Micro inverters add 40% more cost over standard inverters. All micro inverters are limited and are only single phase. Micro inverters take more time to install plus it would be very hard to synchronize each little inverter. I think it is better to stay with the true and tried pure sine inverters for grid tied applications. I am not sure that they can handle India's voltage problems nor are they a good solution for starting inductive loads.

The question here is a grid tied inverter which generates and synchronizes power to grid without any storage. This will work fine as long as the grid is stable and available. When the grid fails, the grid tied inverters go for a stand-by mode for anti-islanding protection. During this condition it is possible to trick an inverter to follow a DG generated out put in an isolated grid, but we would require a higher DG power to avoid any reverse current into DG. The ratio between solar PV and DG production is not clearly established.

On grid solar plant requires synchronization with the frequency and phase of the grid, which is not a problem, can be achieved as part of inversion equipment. In the absence of Grid synchronization can be avoided to save cost. For any design, consider the parameters of Load characteristics, Voltages and maximum currents, other calculations can be derived. A grid-tied inverter just needs to pick up voltage and frequency from the grid, these parameters can also be picked from an external UPS or a generator. You will need to design the system as per the usage and know more about grid-tied inverters before designing such a system.