Solar Panels anchored as per ASCE 7-10 Wind Loading Calculation
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- Опубликовано: 12 сен 2024
- This video show how you can minimize the exposure of solar panels to winds of 180 MPH. The wind load calculations were made following the ASCE 7-10 regulation.
As always, consult with a licensed engineer and observe the required precautions when climbing on the roof of your residence. Be careful, and see that there are no electrical cables that can make contact with you.
1)INTRODUCTION --- 00:54
2)DRAG COEFFICIENT -- 7:44
3)DRAG & LIFT COEFFICIENT -- 11:34
4) UPRA PHOTOVOLTAIC SYSTEM -- 19:38
5)SOLAR PANEL BUNKER STYLE INSTALLATION --25:53
6)WIND LOADING CALCULATION ASCE 7-10 -- 27:35
7)SPREADSHEET CALCULATION OF WIND LOADING -- 37:49
8)INSTALLATION OF MY SOLAR PANEL -- 48:10
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1) • Build Your Own Solar P... (Installation of a Solar System)
2) • Solar Panels anchored ... (Uses of the ASCE-7-10)
3) • CFD LIFT AND DRAG CALC... (CFD LIFT AND DRAG CALCULATIONS...)
4) • HOW TO MOUNT A SOLAR S... (HOW TO MOUNT A SOLAR SYSTEM TO SURVIVE A HURRICANE)
After 3 years, the acid batteries for this system were upgraded to LI-Fe-PO4.
1. • SAYING GOODBYE TO MY L...
SAYING GOODBYE TO MY LEAD ACID BATTERY BANK
2. • BMS CABLE ASSEMBLY FOR...
BMS CABLE ASSEMBLY FOR A 16S LI-FE-PO4 100 AH BATTERY BANK SYSTEM
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WELCOME TO MY NEW LI-FE-PO4 BATTERY BANK
4. • 100 AMP 48 VOLTS DALY ...
100 AMP 48 VOLTS DALY BMS FINAL THOUGH
5. • ASSEMBLING A LIFEPO4 5... ASSEMBLING A LIFEPO4 BATTERY 5.2 KWH SYSTEM
Sincerely,
Learning.Power96@gmail.com
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I have seen that some people get confused with Fy1 and Fy2 forces calculations... you can get a better idea watching this video ruclips.net/video/18Qy6QmuRS4/видео.html. 💪💪💪
Thank you so much for your excellent presentation (totally not boring.)! I've been "planning" a solar installation for the last couple of years, yet I used the lack of wind-load calculation knowledge as my excuse for not doing it. To the contrary, now I have no excuse!!
Let me know if there is a problem. My calculations are for the worst case ... particularly when the wind hits the back of the panels. For this case, the panels are analyzed as airplane wings.
@@learningpower9437 I'd rather use worst case numbers. Here in my region of Utah (US), winds seldom get high. We do though, have a phenomenon known as "micro-burst" which have been recorded at 120 MPH. So that is the number I'm using.
Question:Do you have a reference for designing concrete supports for the panel frame? I need to anchor into soil. I'm guessing 'shear' would not be a problem, but 'lift' would.
@@hippie-io7225 There are several alternatives ... are you thinking of a single pole? ... Personally, I don't like this type of design ... there is too much tension and vibrations through all the panels. Depending on the total area of the panel ... you can distribute the total load around several anchor points ... Again ... you can check these links for ideas: www.eliteprecast.co.uk/keeping-solar-panels-secure-2/ or this www.bluepacificsolar.com/solar-racking/dpw-top-of-pole.html ...
@@learningpower9437 Thank you very much for the links. I like the mounting style used on your roof installation.
@@hippie-io7225 Do you know the size of your photovoltaic system? My system is based on 3 solar panels that require 6 wedge screws as shown in the video. This pattern is repeated until the number of panels to be installed is completed.
Thank you so much for this video, greetings from Brazil
I have posted many videos on this series. If you like something in particular, let me know! Thanks.
Nice video! What is your source for presented CL and CD coeffcient?
In this video, they are maximum based on wing theory...However, if you want to know the exact coefficient...you have to use CFD...such as shown in this video...ruclips.net/video/fl5tYL3u5bE/видео.html and other that are in my channel.
Wow, what an excellent presentation on a very important topic! Thank you for taking the time to do this. I have a few questions. My wind speed is 140mph, my angle is 25 degrees and my panel area is 337 square feet. Using your results, I was expecting my calculations to come out about 5 to 8 times higher for FD, FL and Pressure over the solar panels. I'm off by a large factor. When I checked NASA for lift (FL) and Drag (FD) equations it seemed that they used the same parameters but grouped them differently. For example, your FD for 52.8 SqFt was 1,124 lbs, mine came out to 38,609. With your wind speed higher and my angle greater (and my larger panel area) I'd expect mine to be closer to 6,000 to 8,000 pounds, not 38,609. At 41:00 minutes into the presentation the Calculation of Wind Loading table goes into FD, FL and Pressure but the voice over doesn't really show how these numbers were calculated. If you could help with those three calculations, I would appreciate the clarification. I have my panels, the rack designed and just need to get an idea of the ballast I'd need at each of the 10 posts.
I will check your numbers...and would let you know....However ...for ballast calculation, the back of the panel....should be covered. Hence...you only have to worry about drag...If the panels does not have the backing...lifting will be huge...Are you planning to have the solar panel over a roof ? ...The backing of the panel will definitely reduce the weight of the ballast... Check this ... shorturl.at/nuQ34 as an example.
...I guess that you have already figured out what was wrong...but if not.... your numbers like the 38,609...is because you are using the density in lbs/ft3 ...and the unit should be slug/ft3 ....meaning...you have to divide that 38,609/32...to get the right force in pounds.
Great expiation! Thanks for this video.
I have added many many videos on this topics. We have to ensure that our solar panels are well anchored. I'm glad you like it 👍
Very appreciated finding this video. Could you provide me the reference of the drag and lift force theory?
Here you will find some references...Wind loads on active roofs.
1) Chris P.W. Geurts, Carine A. van Bentum
TNO Built Environment and Geosciences, Delft
2) www.solarabcs.org/about/publications/reports/wind-load/pdfs/Wind_Load_blanksstudyreport3.pdf
3)www.mdpi.com/2076-3417/9/12/2466/pdf
Noticed that the wind pressure over the solar panel was calculated as per the ASCE7-10. However, to get the lift and the drag forces, the solar panel was treated more like an airplane wing at maximum forces.
Thank you for the video
You're welcome👍
*Good afternoon friends ... Some people have requested the necessary calculations to obtain the appropriate amount of ballast to anchor solar panels ... I will be doing a presentation on this subject within two weeks. Stay tuned! Thanks!!!*
Good job!
I have a question if any of you is kind to answer: For the ''bunker'' version, I have no possibility to add barrier bricks. Rather than nothing, can I place shading net? I need though to attach the net to the aluminum structure that holds the panels. Thank you very much
Very good question. The idea of the bunger style is to protect the solar panels from the back side to avoid lift. I will use bricks as long as they are well anchored to the floor to avoid tipping. Shading net does not seems like a strong barrier. I will not use that. Have a great day.
Do not attach anything to the aluminum poles that hold the panels. You will increase the drag force. The barrier should be separate entity.
@@learningpower9437 Thank you for your time
Oh! You have to convert miles per hour to feet per second, right?!
If you are using the equation, q = 0.00256 ... This equation requires that the wind speed be input in mile/hr.
in 44:46 lets say you want to use concrete instead of bolts, what weight should you use?
This a very good question. If you are talking about ballast... you need to consider whether you are protecting the panels so that all lifting forces are converted to drag forces... In that case, the calculation involves the friction factor. If the drag force is approximately 500 pounds and the drag friction factor is approximately 0.5 (concrete on concrete), the ballast should be approximately 1000 pounds.
Nice video, thanks a lot.
I have one question, how you manage to get FL and FD. Which are the values used in the formula?
... at 1:50 ... I was saying that in the worst case it would be like having a coefficient of lift of about 1 and a drag coefficient around 2 ... then at 18:23 the equations for lift and drag forces are shown. I used maximum coef. since I want to anchor the solar panel for the worst case even for winds of around 180 MPH.
Cheers!
@@learningpower9437 thanks again, formula is: FL=CL.1/2.p.A.U2;
Where : CL=1; p=0,07491lb/ft3; A=53,79ft2; U=264ft/s (180mph). Are the values ok? I dont get the same result :(
@@user-gf1qp8oo7o What is your pressure calculation at 180 MPH? ...From the ASCE I got 40.5 lbs/ft2 ... and then you have to use the projected area...and the maximum coef. to get the forces.
@@learningpower9437 thanks for your answer. Im using the same values on your chart q=40,5 lb/ft2; area 53,79ft (which i multiple by the sen on the angle -18-) the i use the formula FL=CL.1/2.p.A.U2, but I dont get the same result
@@user-gf1qp8oo7o send me an email with your calculations at learning.power96@gmail.com
How to get sealed wind load calculations report in Florida for county permitting
Do you mean maximum wind loading calculations ? Cheers.
How Fy1 and Fy2 are calculated?
There is a second video in this series that is correcting lift and drag forces based on the area of the solar panel. However, in this video, the Fy1 and FY2 are the forces only in the vertical direction under the assumption that the solar panel structure can be flexible ... which is not the case. If the structure is rigid, then we need to calculate the moment at the anchored points. Still want to know how I calculate Fy1 and Fy2 here?
@@learningpower9437 many thanks
I am just confused what formulation u r gona using to calculate moment
@@muhammadhaseebkhan7957 uPPSSSSS...The calculation of the moments in the anchored points is very cumbersome ... it is preferred to use a software like SAP or like to get those results ... In a few days ... I would generate a video ... with these calculations made following the corrections according to video # 2.
HI can you sent me the calculations for Lift and Drag because I am not able to get your answers.
....Maybe this can clarify....... at 1:50 ... I was saying that in the worst case it would be like having a coefficient of lift of about 1 and a drag coefficient around 2 ... then at 18:23 the equations for lift and drag forces are shown. I used maximum coef. since I want to anchor the solar panel for the worst case even for winds of around 180 MPH.
Isn't the standard angle 10 degrees?
In Puerto Rico...you can get away...from 0 to 20 degrees....the lower the better to avoid winds from the north.
I can not get same result with you Pressure over solar panel is 25 lbs/ft2 multiplied by total area 52.8 ft2 is equal to 1320 lbs. But how you define on FY1 FY2 pressure
I would let you you...If you have an email I would send you the answer.
@@learningpower9437 can you send me as well. At avinashrnair1@gmail.com
@@avinashr307 Did you get my replay here as part of the comments ??? ....Somehow...I have seen that some comments were deleted from youtube....and I want to be sure that I answered your questions. Let me know.
Same confusion