Why this Blog?

The purpose of creation of this new blog was to add all my work that will solely related to my DIY Solar and wind electricity generation system. I will also add here the adventure of my DIY micro-hydro turbine (PAT) unit that has been planned to be implemented in the beautiful Kalam valley. In the recent past i unintentionally got attraction toward the green energy and studied a lot about.

My last visit to Karachi home was the turning point to divert all my intentions and resources toward getting into hybrid solar+wind electricity system. The 12 hours shedding at Karachi was really a mental shock to me. The 2Hours alternate load shedding scheme was so pathetic that for three nights i had only 6 hours of sleep in total. The Starting/Stopping the generator (located at the third floor) was a real muscular exercise especially the last part of the night.

The ready made solution requires a handsome amount of money. Here i will post my DIY approach to get the job done considering the advantage of being low cost, worth of experience and as per my requirement and quality. I intend to work on both Solar and wind turbine simultaneously so that to give the relief to my family.

Lets see will i have success in this endeavor?

Sunday, May 13, 2012

Why Single Axis Sun Tracking?

After successful completion of the DC Motor controller , it is time to make the Heart of the control circuit. I have recently completed the AVR based Single Axis micro-controller circuit for Azimuth tracking of the sun.

Using dual axis solar tracking is a good idea but controlling the Altitude motor with respect to sun has very little benefit as compare to Azimuth control.Let us see the following figures for explanation:

The position of the Sun in the sky relative to an observer on Earth is defined by its altitude angle α (solar elevation angle) and its azimuth angle Ψ. The sun moving from East to West and the this angle we call it Azimuth Angle. The sun daily cover this Azimuth Angle. However, The Altitude Angle of the sun is changes throughout the year (seasonal motions) with a very little increments during the year days.This altitude angle is 46 degrees north-south  over the period of a year. In winter the sun is more toward the Southern side and Altitude angle is small . Whereas in the summer the Altitude angle is on the extreme and sun is just traveling at the top of our head;)..

A recent review of actual production statistics from southern Ontario suggested the energy difference between the single-axis tracker and dual-axis tracker was about 4% in total, which was far less than the added costs of the dual-axis systems. This compares unfavorably with the 24-32% improvement between a fixed-array and single-axis tracker. This is the reason I prefer to use Azimuth control of my solar panels.

Here is the micro-controller(ATMEGA328P) based single axis Azimuth control circuit with East-West limit switches. In future i shall explain how will this work.

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