Author Topic: solar cells and water (rain)  (Read 7146 times)

0 Members and 1 Guest are viewing this topic.

Offline Simon

  • Global Moderator
  • *****
  • Posts: 13841
  • Country: gb
  • Did that just blow up? No? might work after all !!
    • Simon's Electronics
solar cells and water (rain)
« on: May 29, 2011, 02:17:59 pm »
Well as some may remember i have me a nice pack of 40 x 1.8W solar cells that yes i have still not got around to using. My main obstacle I think is what to cover them in ? I'm worried that perspex may discolour and I'm not sure i want to use glass although I suppose in the end I'll go get some perspex.

A thought did occur to me though: So what if the cells get wet ? does water damage solar cells ? I mean once the sun comes out again they'd dry off pretty nippy. I presume that as I'm the only nutter to consider this, water on solar cells is NOT a good idea ?
https://www.simonselectronics.co.uk/shop
Varied stock of test instruments and components including EEVblog gear and Wurth Elektronik Books.
Also, if you want to get ripped off: https://www.ebay.co.uk/usr/simons_electronics?_trksid=p2047675.l2559
 

Offline sacherjj

  • Frequent Contributor
  • **
  • Posts: 993
  • Country: us
Re: solar cells and water (rain)
« Reply #1 on: May 29, 2011, 03:59:00 pm »
I've not seen solar cells for mounting that didn't have a clear potting or covering.  That should have no problem with water.  I would be concerned if you put up a raw cell, due to any impurities in the rain depositing on the raw cell.  It seems like it could effect it over time.
 

Offline Simon

  • Global Moderator
  • *****
  • Posts: 13841
  • Country: gb
  • Did that just blow up? No? might work after all !!
    • Simon's Electronics
Re: solar cells and water (rain)
« Reply #2 on: May 29, 2011, 04:11:34 pm »
yes that would be one drawback - acid rain
https://www.simonselectronics.co.uk/shop
Varied stock of test instruments and components including EEVblog gear and Wurth Elektronik Books.
Also, if you want to get ripped off: https://www.ebay.co.uk/usr/simons_electronics?_trksid=p2047675.l2559
 

Offline Simon

  • Global Moderator
  • *****
  • Posts: 13841
  • Country: gb
  • Did that just blow up? No? might work after all !!
    • Simon's Electronics
Re: solar cells and water (rain)
« Reply #3 on: May 29, 2011, 06:20:59 pm »
Is there a transparent potting compound I could use ?
https://www.simonselectronics.co.uk/shop
Varied stock of test instruments and components including EEVblog gear and Wurth Elektronik Books.
Also, if you want to get ripped off: https://www.ebay.co.uk/usr/simons_electronics?_trksid=p2047675.l2559
 

Offline Zero999

  • Super Contributor
  • ***
  • Posts: 13110
  • Country: gb
  • 0999
Re: solar cells and water (rain)
« Reply #4 on: May 29, 2011, 07:35:43 pm »
Why not use a varnish or lacquer?
 

Offline Simon

  • Global Moderator
  • *****
  • Posts: 13841
  • Country: gb
  • Did that just blow up? No? might work after all !!
    • Simon's Electronics
Re: solar cells and water (rain)
« Reply #5 on: May 29, 2011, 07:40:17 pm »
well not sure about varnish, If I'm covering them I might as well go the full hog and make them mechanically protected too. After all commercial panels are potted essentially. Of course there was that plan to give them some air space and air cool them so maybe I should just get some plexiglass
https://www.simonselectronics.co.uk/shop
Varied stock of test instruments and components including EEVblog gear and Wurth Elektronik Books.
Also, if you want to get ripped off: https://www.ebay.co.uk/usr/simons_electronics?_trksid=p2047675.l2559
 

Offline Mechatrommer

  • Super Contributor
  • ***
  • Posts: 9126
  • Country: my
  • reassessing directives...
Re: solar cells and water (rain)
« Reply #6 on: May 29, 2011, 08:10:34 pm »
i vote for glass or perpex. permanent cover will make modification impossible to solar panels.
if something can select, how cant it be intelligent? if something is intelligent, how cant it exist?
 

Offline Fraser

  • Super Contributor
  • ***
  • Posts: 8633
  • Country: gb
Re: solar cells and water (rain)
« Reply #7 on: May 29, 2011, 08:31:39 pm »
Not persex. Use clear Polycarbonate sheet or even the clear (untinted) cellular polycarbonate that is used for a conservatory roof.

In manufacturing even fingerprints on the unprotected cells are a problem and cotton gloves are worn. IMHO rain in direct contact with the cells will produce contamination of the cell material destroying it, and electrolytic corrosion of the contact strip surfaces (rain is quite dirty and not pure water).

In three words....keep them dry  ;)

 
« Last Edit: May 29, 2011, 08:36:31 pm by Aurora »
 

Offline Vertigo

  • Regular Contributor
  • *
  • Posts: 78
Re: solar cells and water (rain)
« Reply #8 on: June 13, 2011, 08:52:26 am »
if they are going to be exposed to rain, also consider: snow, hail and other things falling from the sky such as bird crap.
which i believe is more acidic then acid rain.
whatever u use, it might be good if it can stand up to aggressive cleaning materials, cuz that bird crap can be hard to get off.

 

Offline bilko

  • Frequent Contributor
  • **
  • Posts: 405
  • Country: 00
Re: solar cells and water (rain)
« Reply #9 on: June 13, 2011, 12:27:11 pm »
Your local glazier should be able to supply you with toughened glass, its not that expensive and you can get it cut to exact size
 

Offline sacherjj

  • Frequent Contributor
  • **
  • Posts: 993
  • Country: us
Re: solar cells and water (rain)
« Reply #10 on: June 13, 2011, 02:15:34 pm »
And one other thing to consider if how to keep the temperature down.  I believe it is still the case that cells performance drops pretty bad with increases in temperature.  Not sure if this is done in commercial cells or not.  I guess there could be a problem with spiders and such, getting in and mucking up the works.  :)
 

Offline scrat

  • Frequent Contributor
  • **
  • Posts: 606
  • Country: it
Re: solar cells and water (rain)
« Reply #11 on: June 13, 2011, 04:23:36 pm »
And one other thing to consider if how to keep the temperature down.  I believe it is still the case that cells performance drops pretty bad with increases in temperature.  Not sure if this is done in commercial cells or not.  I guess there could be a problem with spiders and such, getting in and mucking up the works.  :)

I agree. Keep them closed. You can still take them cool by mounting on a conductive panel and making it dissipate.
One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man. - Elbert Hubbard
 

Offline hannobisschoff

  • Contributor
  • Posts: 38
  • I get high on solder fumes.
Re: solar cells and water (rain)
« Reply #12 on: June 14, 2011, 01:55:37 pm »
if they are going to be exposed to rain, also consider: snow, hail and other things falling from the sky such as bird crap.
which i believe is more acidic then acid rain.
whatever u use, it might be good if it can stand up to aggressive cleaning materials, cuz that bird crap can be hard to get off.


Nice thinking there. I would've forgotten about it.
 

Offline scrat

  • Frequent Contributor
  • **
  • Posts: 606
  • Country: it
Re: solar cells and water (rain)
« Reply #13 on: June 14, 2011, 02:22:43 pm »
if they are going to be exposed to rain, also consider: snow, hail and other things falling from the sky such as bird crap.
which i believe is more acidic then acid rain.
whatever u use, it might be good if it can stand up to aggressive cleaning materials, cuz that bird crap can be hard to get off.


Nice thinking there. I would've forgotten about it.

Maybe half of the world would've forgotten about the snow, at least!
One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man. - Elbert Hubbard
 

Offline Mechatrommer

  • Super Contributor
  • ***
  • Posts: 9126
  • Country: my
  • reassessing directives...
Re: solar cells and water (rain)
« Reply #14 on: June 14, 2011, 03:27:31 pm »
but not the bird crap, and spiders
if something can select, how cant it be intelligent? if something is intelligent, how cant it exist?
 

Offline Sionyn

  • Frequent Contributor
  • **
  • Posts: 848
  • Country: gb
Re: solar cells and water (rain)
« Reply #15 on: June 17, 2011, 02:44:11 pm »
eecs guy
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf