Archive for April, 2013

Clicking noise from HDD??

April 22nd, 2013 No comments

Have you wondered replaced your hard drives (HDD), when there is “clicking” noise from the HDD?  When you hear that noise, it means the drive is performing a “hard-reset” internally.   I have always thought that the disk is a goner, when there is too much clicking noise from the HDD.

Lately, it was found that when the gave the HDD the 5 pin power cord, the clicking noise is gone.  In general, 4 pin power has <+12v, 0v, 0v, +5> and the 5 pin power cord has an additional 3.3v orange line.  Another discovery recently is that, the clicking noise is gone when I changed the SMPS.  When the SMPS is over loaded or so, I think it is not able to supply the current that the HDDs want, which in turn makes the HDDs to perform a hard reset internally.

So, before applying for a replacement HDD, please do try changing the power cord to a 5pin cord and when you cannot try replacing the SMPS.  Typically, when you have lot of devices in your machine, ensure you use a reasonably powerful SMPS to avoid outages.


1.5KWp Solar Power Plant

April 22nd, 2013 3 comments

Another Solar Power Plant project @Mogappair, Chennai

This time, I have helped a friend of mine to setup up the power plant for his home.  He had given a requirement to run everything in his home except the heavy duty equipment like A/C, Microwave Oven, Water heater & Washing machine. While measuring the load requirements, he had a peak load of about 1.5KW and an average load of ~600W and at nights the load was <200W average.

This time, I wanted to get a simplified inverter solution that does not require and interaction per se for the end user. So, we have procured a 2KW ESU inverter from Emerson, which was priced as Rs 55000/-.This inverter model comes with an inbuilt 48V/35A MPPT controller and a unity PF 2KW power inverter.  So, for these models of Emerson 2KVA is 2KW as the PF is 1.

Although Emerson has a good track record of quality products, their service customer care is outsourced, who do not function very well. Also the delivery time for the inverter is 5-6 weeks, but on paper they say 4 weeks. For the Mogappair area, the service is handled by Sri Nandees Technologies, who technicians on call are pretty good and responsive.

As usual, we procured the batteries (4x180Ah) from Sharana batteries for Rs 54000. Since my last installation, the price of batteries went up by ~5% for all the battery brands.  And the panels (24v/250Wp x 6) were procured from Akshaya Solar @42/watt for Rs 63000 and the structures for planting the panels were also got from Akshaya Solar for additional ~Rs 10000. And for the electrical works and civil works, we spent another Rs 18000.  Overall, we have finished the entire project for Rs 200,000 all inclusive.

Thanks to our electrician Mr. Raja  & vendors (Mr. Raju @Akshaya Solar, Mr. Aruldass @Sharana batteries, Mr. Karthik @Sreenandees, Mr. Jayaraj @Emerson) who helped us see this project through.  Incidently, this is the only domestic installation in the 1.5KWp range in the entire Ambattur, Avadi, Mogappair, Padi, Anna Nagar range AFAIK. 🙂


பாடல்கள் கேட்கும்போது காதலுணர்வு வருமா?

April 16th, 2013 No comments
புறத்தே புலனால் அரும்பும் காமம்;
அகத்தே ஆழத்தே ஊறும் அன்பு;
காமத்தோடு இசைந்த அன்பு காதலாகிவிட,
செவியோடு கசியும் இனிய பாடல் ஒன்று
அக்காதலை தூண்டுவது நியாயம்தானே!