Comments on Instructions

Comments

Submitted by basheer mhd on Sat, 02/14/2015 - 15:03

how I can save this CD

Submitted by stuart on Sat, 02/14/2015 - 15:28

There is no off line version at present.

Submitted by younesibrahim80 on Mon, 04/20/2015 - 02:40

HOW CAN I FIND THIS INFORMATION ON BOOKS PDF

Submitted by rajat.saraswala on Mon, 04/24/2017 - 05:41

hello sir, im electrical engineer.I need a hard copy of whole attachments.
waiting for your kind responce.
thank you.

Submitted by Asamad on Thu, 11/23/2017 - 04:02

How to see the animations on iPhone and iPad ...

Submitted by stuart on Wed, 02/14/2018 - 19:51

The animations are in flash that is not supported by the iPad. Unfortunately there are still no suitable substitutes.

Submitted by Ryousuke Ishikawa on Tue, 02/27/2018 - 02:14

Nice to meet you. I am grateful to have studied with your wonderful teaching materials.
Recently sliders and Flash animations on the web do not seem to work well.
I tried the latest FlashPlayer with Chrome, IE and Firefox but it did not work.
What should I do?

Submitted by stuart on Wed, 02/28/2018 - 16:18

As far as I know they still work. Which page is the problem?

Submitted by ganley0905 on Tue, 07/24/2018 - 10:32

This is a question, not a comment. Can I copy figures from one of your pages for use on a website I am building for my startup? I will acknowledge your site as the source. Thanks. J. T. Ganley

Submitted by stuart on Thu, 02/28/2019 - 09:59

As long as you acknowledge the source of the images you may use figures for your site. If it is a website just make sure you have at a minimum

Picture: www.pveducation.org

And a link to the website.

Submitted by PFL2020 on Mon, 03/02/2020 - 21:55

I'd love to be able to print sections instead of part by part.

Submitted by TimCHEN on Wed, 12/30/2020 - 03:42

This website supplies abundant, detailed, and reliable resources for PV learning! I've studied some parts of the section "properties of sunlight". It helps me a lot in deed. Thanks!

Submitted by holretz on Wed, 03/02/2022 - 17:15

I live in Aasiaat, latitude 68,7 degrees north. According to the curves for calculation of solar incidence, a solararray should be tilted around 55,5 degrees. It says somewhere else on one of the pages, that one should choose tilt equal to latitude.
This is clearly not the case for my latitude, so I don't quite understand this statement....is it true for some limited range of latitudes ?

Submitted by Peter W on Wed, 10/26/2022 - 07:20

I believe the formula given for solar radiation on a panel with arbitrary orientation and tilt is incorrect. I think it should be:
Smodule = Sincident .cos(Ψ-θ).[cos(α)sin(β) + sin(α)Cos(β)]

Reason: On the previous page, for a module directly facing the sun, at tilt β:
Smodule = Sincident. sin(α+ β), where
sin(α+ β) = cos(α)sin(β) + sin(α)Cos(β)
For a module at orientation θ,
Smodule = Sincident .cos(Ψ-θ). sin(α+ β), so
Smodule = Sincident .cos(Ψ-θ).[cos(α)sin(β) + sin(α)Cos(β)], not as given.

Submitted by petercl14 on Thu, 05/02/2024 - 03:36

Hi, Equations for the position of the sun,. elevation angle and azimuth. If I enter 9 for 9am in the morning being the local time in the equations I get accurate results. I compare the result with an application on the internet which gives the elevation and azimuth at my location and time. However, if I enter say the number 13 for 1pm I no longer get an accurate or comparable result.
Can you please let me know what I should enter in the equations for pm times? Should this be perhaps a negative number? I never had to put 'am' after the 9 in the equation.
I am making a computer application using the equations to simply put in the local time and days since the start of the year to give me the elevation and azimuth of the sun. These are the only variables in the equations. All the other data is fixed for my location. The application on the internet also probably uses these equations.
Please let me know the local times I should enter for the pm time to get an accurate result. Thanks.