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 41 
 on: July 02, 2019, 08:32:34 20:32 
Started by zac - Last post by zac
Does anyone have experience keeping snow from accumulating on roof mounted solar panels in a mountain climate with heavy snow accumulation (up to 100 pounds/sqft)?  

Since the winter wiped out my solar array and is being replaced by insurance, I'm trying to come up with a way to prevent the snow from sticking or to melt it.  One possibility was with heat tape, but the stuff is expensive and I'm uncertain if sticking on the perimeter aluminum frames of the solar panels would warm the panels enough to prevent snow accumulation.  

https://www.tempco.com/Products/Electric-Heaters-and-Elements/Flexible-Heaters/Adhesive-Backed-Heating-Tape.htm

Or electrical heating cable for radiant floors:

https://www.lowes.com/pd/schluter-systems-0-188-in-x-634-8-in-grey-120-volt-warming-wire/50201647

Another idea is to put flexible pipe underneath the panels to circulate hot water (some kind of liquid like a propylene glycol solution that won't freeze) through.  This would be something similar to the PEX flexible pipes used for plumbing and radiant floor heating and would only be run immediately before and while it is snowing.  it would need to be UV (sunlight) resistant.   I imagine melting a several foot thick accumulation would be very difficult if allowed to accumulate.  

http://www.pexheat.com/Tubing_2

1/2" PEX pipe costs about US$0.24/foot which seems pretty reasonable. With a 24 panel 7.5 kw array (roughly 34' x 13'), 1000' would be enough for 7 passes under each panel which may be more than necessary.  

https://www.amazon.com/1000ft-Tubing-Barrier-Radiant-VIVO/dp/B00HFFCL9Q

https://www.radiantcompany.com/system/closedsystem/

https://www.amazon.com/ECOTOUCH-Electric-Tankless-Digital-Efficiency/dp/B07MDZC6KG

https://www.amazon.com/Rheem-RTEX-13-Heating-Residential-Tankless/dp/B01NAUZJPE

https://www.amazon.com/Grundfos-15-58-Speed-Circulator-Cast/dp/B07DM3B8HD


 

 42 
 on: July 01, 2019, 03:53:05 15:53 
Started by pic_maniac - Last post by pic_maniac
Many times a random generator is needed but also a defined range too.

Say you need a range of 1-6 for an electronic dice.

In PicBasic this is done like this:

Code:
random my_variable
my_value=(word_variable//5)+1

my_value can be byte size while my_variable should be word size.

The random function is not really random and if you reset PIC, every time will start with exactly the same sequence, so you can predict the numbers coming.

 43 
 on: June 30, 2019, 06:06:35 18:06 
Started by hmruben - Last post by hmruben
CountryEcuador
NoteI am an electronic officer working on my personal projects

 44 
 on: June 29, 2019, 07:21:06 19:21 
Started by Cyberrat - Last post by Cyberrat
ah, I thought it was chrome - cheers.
Now to look at the training side - I found a site with some videos.

 45 
 on: June 29, 2019, 05:51:59 17:51 
Started by Cyberrat - Last post by pickit2
I thought Mega had a size limit of 800MB before using their MagaApp
I have added 420MB size files to main post.

 46 
 on: June 29, 2019, 04:13:42 16:13 
Started by Cyberrat - Last post by Cyberrat
excellent - only chrome wont let me download it Sad

 47 
 on: June 29, 2019, 12:43:19 12:43 
Started by Rohaan - Last post by Rohaan
Countryindia
NoteI am a student, studying on Micro controller base project.
through searching I came to this form.
I want to join this form to study Micro controller base system in details so that I can develop my carrier in it.

 48 
 on: June 29, 2019, 08:17:16 08:17 
Started by pickit2 - Last post by pickit2
Autodesk AutoCAD Electrical 2020 (x64)

Autodesk AutoCAD Electrical Software Features and Features:
 -Designing a variety of electrical circuits dynamically
 -There is a complete list of electrical components for drawing a plan
 -Generate reports automatically
 -Three-dimensional design of circuits
 -Ability to debug and troubleshoot circuit
 -Ability to add annotations and annotations alongside the layout
 -Ability to output schematic schema in PDF format
 -Use folders and categorize them to organize the project and support the ability to drag and drop files into folders.
 -Numbering of wires and components automatically to reduce errors
 -Support for DWG technology and format
 -Co-ordination with other AutoCAD family software

System Requirements: OS:
 -Microsoft® Windows® 7 SP1 with Update KB4019990 (64-bit only)
 -Microsoft Windows 8.1 with Update KB2919355 (64-bit only)
 -Microsoft Windows 10 (64-bit only) (version 1803 or higher)


Links below
720MB per file link: links.txt
420MB per file link: 6x420MB per file link.txt

 49 
 on: June 29, 2019, 07:14:11 07:14 
Started by Cyberrat - Last post by pickit2
Autodesk AutoCAD Electrical 2020 (x64)
link in main topic

 50 
 on: June 29, 2019, 07:03:46 07:03 
Started by Cyberrat - Last post by Cyberrat
Hello, I cannot see a recent AutoDesk Electrical version being available - is one please?

Also is any training and/or libraries available for Electrical?

Thank you. 

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