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?

Wednesday, May 23, 2012

Calculating Energy efficient Tilt Angle for Solar Panel

As I have already discussed in the previous post that i am adding single axis tracking to my solar panel and the Altitude angle (Tilt angle) shall be adjusted in Summer and Winter to get the maximum efficiency out of the solar panels. Here are the Rule of thumb for best tilt angle.


Winter    --------------------  (Latitude x 0.89) + 24 degrees
Summer  -------------------  (Latitude x  1.05) - 24.3 degrees
Spring & falls --------------   (Latitude x0.98) - 2.3 degrees

Pakistan resides in Northern hemisphere so the Solar panel should be toward the TRUE NORTH. The Tilt angle is calculated from the Horizon.


Latitude (from google) : 28.1700 N  
Tilt Angle for Winter= (28.17 x 0.89) +24 degree  = 49.07 
                               = Say 49 degree  from horizon or   (90- 49 = 41 degree) from the vertical
Tilt Angle for Summer= (28.17 x 1.05) -24.3 degree  = 5.27 
                                = Say 5 degree from horizon or (90-5 = 85 degree) from the vertical
Tilt Angle for Spring & Fall=  (28.17 x 0.98)-2.3 = 25.306
                                 =  Say 25 degree   from horizon or (90- 25 = 65 degree) from the vertical

As these solar panels i intend to install in Karachi so:

Latitude (from google) : 24.8508 N  
Tilt Angle for Winter= (24.8508 x 0.89) +24 degree  = 46.11  = Say 46 degree  (90-46 = 44 degree )
Tilt Angle for Summer= (24.8508 x 1.05) -24.3 degree  = 1.79  = Say 1.8 degree (90-1.8=88.2 degree)
Tilt Angle for Spring & Fall=  (24.8508 x 0.98)-2.3 =  Say 23 degree


  1. I will be sure to bookmark your blog and will come back sometime soon. I want to encourage you to ultimately continue your great job, have a nice day!... Solar Panel

  2. Are these tilt angle correct.
    I am getting completely different figures from this web site.


    1. This comment has been removed by the author.

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  7. correction: True South not North in the northern Hemisphere!

    1. I believe you are correct, should face South, not North.

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