Monthly Archives: May 2012

Micro-Inverters gaining an edge over the traditional String Inverters

The National Renewable Energy Laboratory of US Department of Energy has created a test protocol which can create a real shade condition and can tell with a great accuracy the effect shading has on the solar array. The good thing is that the test protocol can simulate any type of shading condition.

The use of the system shows that in typical shading conditions that micro-inverters can increase the performance of the system by upto 12% as compared to the traditional string inverters. The research was carried out by senior engineers of NREL which was funded by DOE.

As a known fact that shading can seriously hamper the performance of a photovoltaic system. The effect of performance depends on various factors such as the configuration of the PV module as well as the shading on the system. Currently there is a lack of test protocols in the market which can calculate the average shading per year on various shading conditions. The report of NREL describes a test protocol which can analyse the yearly data and the measurements can be used to calculate annual performance.

The parameters for measurements taken for the shading analysis for the report consisted of 60 residential properties and shading was classified into three categories “light”, “moderate” and “heavy”. The data collected from these systems along with the annual shade loss and  inverter CEC efficiency will allow software such as PV Watts and system advisor model will allow for an accurate performance analysis.

Under the normal conditions for a 8-KW system it was found that micro-inverters increased the production by 3.7% under light shading, 7.8% under moderate shading and 12.3% under heavy shading as compared to string inverters.

This research will provide a major step in establishing new PV systems providing a better performance considering the shading effect.


(Author: Mohd. Arif)


A very good piece of information which i found on the Natural Group’s Blog, so thought of sharing it will the readers

Now generate electricity with a strike of paint!!!!

I was just going through some latest inventions and this is what i found in one of the websites. Prof. Paul Dastoor has invented this new SOLAR PAINT”, which makes it so convenient to utilize that power of sun without much investment. The link to the technology about the Solar Paint which shows the video of how it is done has been embedded in the post.

Solar Paint is an environmentally friendly solar cell technology that will allow every household in Australia to generate their own electricity, affordably and sustainably.
The invention involves the development of a completely printable organic solar cell based on semiconducting polymer nano particles dispersed in water. Essentially these tiny particles in suspension are a water-based paint, which can be printed or coated over large areas. In the first instance these coatings will be put onto plastic sheets that can be placed on the roof of a house. However, in the longer term it will be possible to directly paint a roof or building surface.

(Author: Suman Srivastava)

(Source: ABC,


Solar to Help the Blind – A New Breakthrough

Using tiny solar-panel-like cells surgically placed underneath the retina, scientists at the Stanford University School of Medicine have devised a system that may someday restore sight to people who have lost vision because of certain types of degenerative eye diseases.

This device — a new type of retinal prosthesis — involves a specially designed pair of goggles, which are equipped with a miniature camera and a pocket PC that is designed to process the visual data stream. The resulting images would be displayed on a liquid crystal micro display embedded in the goggles, similar to what’s used in video goggles for gaming. Unlike the regular video goggles, though, the images would be beamed from the LCD using laser pulses of near-infrared light to a photovoltaic silicon chip — one-third as thin as a strand of hair — implanted beneath the retina.

Electric currents from the photodiodes on the chip would then trigger signals in the retina, which then flow to the brain, enabling a patient to regain vision. “It works like the solar panels on your roof, converting light into electric current,” said Daniel Palanker, PhD, associate professor of ophthalmology and one of the paper’s senior authors. “But instead of the current flowing to your refrigerator, it flows into your retina.”


(Author: Mohd. Arif)

(Source: Science Daily)

Delhi Electricity Regulatory Commission towards Renewable technology for electricity generation

Finally the bells are ringing in the Delhi Electricity Regulatory Commission to alert them about the Renewable Sources of Energies available abundantly. According to an article in Times Of India  the DERC will be announcing a 2% renewable energy obligation (RPO) for Delhi discoms (Source: Times of India). This move will make it mandatory for the discoms to provide 2% power through renewable energy resources including wind, solar, municipal waste etc.

Solar Energy seems to grab the attention of the authorities now as the new regulation will mandate at least 0.1% solar power among various other sources. Delhi government will be in line with other state governments such as Gujarat, Maharashtra and Rajasthan who are already producing a good amount of renewable energy. However there seems to be some doubts among the consumers relating to the costly proposition of solar market but with the drastic decrease in the per unit rates of solar energy from Rs. 18 per unit to current Rs. 8-9 per unit the stakeholders can find some relief following the national solar mission of the country. The execution can be divided into several phases and also can be done through Roof-top policy which has to be decided by the decision makers. The people just have to wait and see when and how is the policy implemented for a cleaner, greener society.

(Source: Times of India)