Support the Arctic Sea Ice Forum and Blog

Author Topic: Solar Roadways  (Read 21061 times)

logicmanPatrick

  • ASIF Citizen
  • Posts: 244
    • View Profile
    • The Chatter Box
Re: Solar Roadways
« Reply #150 on: September 21, 2017, 04:47:47 AM »
Solar roadways are most effective when not used as roadways.

The hexagons have about 50% active solar panel area.

Traffic, whether pedestrian, cyclist or vehicular throws shadows.

Shadows have greater area the further North or South from the equator.

Shadows consist of umbra and penumbra, so the shadow area is always greater than the geometrically projected area of the object casting the shadow.

Any single cell in a series which is shadowed acts as a resistance to all the other cells, rather like an aged battery in series with new ones.

Road panels are laid flat.  The further from the equator the lower the efficiency.


A better design: An open-sided shelter.

Solar panels should be placed above the road, forming a roof.
The side towards the prevailing wind should consist of open mesh or louvres.  The other side is best left open.

The panels are fixed, oriented to about 12 local time and midway between local max and min zenith angle.  This makes for a simple design with no need for motors to move the panels.

The open mesh or louvred side will actively reduce the impact of wind, rain or snow on road users.

The streetview image linked below shows how the Swale crossing and the louvres keep rain off the ground to such an extent that the soil is bare of plants.

Swale crossing

I am currently installing solar panels in my garden to power my fridge.  I can confirm by direct experiment that if a part of a panel is in shadow, then the whole panel acts as if in shadow: the power drop is significant.
si hoc legere scis nimium eruditionis habes

Rob Dekker

  • ASIF Middle Class
  • Posts: 579
    • View Profile
Re: Solar Roadways
« Reply #151 on: September 21, 2017, 08:49:16 AM »
Regarding solar roadways, I am completely with Dave @ EEVblog, and with several  posters here.

Here is another debunking by Dave on the French system, which uses some sort of polymer PV system that they get to glue to the road :


Even though this concept the cheapest solution out there, it is still 3X the cost of properly installed PV panels, at half the production. A 6X cost disadvantage. To use Dave's words : "It's just completely impractical !".

In general, from an engineering point of view, if you have X dollars to burn on a solar system, as long as you don't live at the equator, you don't put it flat on the ground, you tilt it towards the sun ! Gives a 1/cos(lat) improvement.

And even if you really want to put it flat on the ground, don't let anything drive over it !
You need all kind of enforcements to let vehicles drive over you panels, which pumps up the cost tremendously. At least put these solar panels between freeway lanes or next to railroad tracks or ANYWHERE where you have a bit of free space.

Putting them in a place where vehicles drive over them is just insane.

And regarding putting a 'snow-melt' system in the road, or some LEDs, that is just a completely separate system that has nothing to do with your solar cells in the road. After all, the LEDs are only useful at night and the snow-melting system would switch on when the road is covered in snow. Either way, you will NOT have solar power when these systems switch on.

Sigmetnow

  • ASIF Royalty
  • Posts: 9373
    • View Profile
Re: Solar Roadways
« Reply #152 on: October 06, 2017, 03:15:30 AM »
Those of you who "don't get it," please remain calm.  See what happens.

Solar Roadways posted on their Facebook page:
Exciting News: We were in Austria last week, meeting with an interested manufacturing partner there called Blue Sky Energy:
http://www.bluesky-energy.eu/?lang=en.

They currently manufacture environmentally safe saltwater batteries which would pair nicely with SR.

They have a huge, fantastic, open factory as you can see in the photos and they are interested in beginning the manufacturing of Solar Roadways panels there for the European market. We are now in talks with them regarding the details. If you are interested in getting involved in this European endeavor, feel free to email us for more info or request a personal introduction to Blue Sky Energy...
...
It’s time to get full production going around the world so we can begin to say “Yes” to the interested customers who reach out to us from all over the world every week.
https://www.facebook.com/solarroadways/posts/10154633700377126
Photos at the link.

Solar Roadways commented:  "Thank you Kaye Clark, we are blessed to have tons of interest from all 50 states. We are also in talks re manufacturing in Ohio and once we get going, we'll need manufacturing in just about every state. :) "
People who say it cannot be done should not interrupt those who are doing it.

crandles

  • ASIF Upper Class
  • Posts: 1773
    • View Profile
Re: Solar Roadways
« Reply #153 on: October 06, 2017, 11:14:32 AM »
Replies to every comment it seems. Almost as if they are more interested in getting an internet presence/following than getting on with doing things?? Or is that too harsh?

Sigmetnow

  • ASIF Royalty
  • Posts: 9373
    • View Profile
Re: Solar Roadways
« Reply #154 on: October 06, 2017, 08:06:46 PM »
Replies to every comment it seems. Almost as if they are more interested in getting an internet presence/following than getting on with doing things?? Or is that too harsh?

They've done that since the beginning.  It's a little unusual, but they are always very polite, and I think they genuinely appreciate positive comments, given all the flack they also receive!  They don't sponsor or pay for ads, so only people who follow them (or look them up) will see the comments.  No doubt they feel they should use any opportunity to correct misinformation they come across, and spread positive news.
People who say it cannot be done should not interrupt those who are doing it.