alt Hacker NewsIt seems like it would be more effective to simply put all the solar panels in a field, and construct a cheap shade over the entire canal no? The supports in the picture are massive and don't look cheap. Also I would imagine the solar array uses more copper than a similar capacity array just built in a field. You can't daisy chain multiple miles of solar panels together, so you need an extra power line to run alongside the whole thing.
Put the solar panels in a field: The solar array uses less copper. The shade supports don't have to hold up solar panels: Shade supports cost less.
The best reasoning they give is that California has insane permitting requirements, and it takes 1/6 the time to build on developed land compared to undeveloped land.
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> It seems like it would be more effective to simply put all the solar panels in a field, and construct a cheap shade over the entire canal no?
No because now you're using land that could be used for other things, which is exactly what this avoids. This takes existing land that loses water and costs money, and makes it lose less water and make money.
My understanding is that "The best reasoning they give" is the entire point. It such a huge issue that it drowns out all of the valid but smaller issues you are pointing out. And, the benefit to the water is just a bonus.
The cost of building that steel structure that will hold up against maximum in 100 year wind forces isn't cheap. Large PV panels make very good sails. The trusses look basically the same as you'd see in a large agricultural barn, horse riding arena, etc. Putting the PV panels on empty bare land at a height people can walk around and work with would be considerably less costly.
I would very much like to see a total dollar figure for the example "roof trusses over the canel" structure vs. how many panels it can hold.
It's already true that the ground mounting costs and labor to assemble the ground mount are a huge part of building a large scale PV system.
How about hanging solar panel vertically on tall buildings covering every floor except the first few to prevent vandalism
As the earth moves the sun would only hit one side and lose efficiency but right now it's "free space" not being used otherwise
They even make flexible solar panels now that can bend and move with the wind and don't need a stiff frame, slightly less efficient but volume makes up for that
Clean them the same way automated window washers work on skyscrapers
Shame they never came up with the solar paint solution, yet
What's the lifetime of a "cheap shade"? And the cost to renew it over the same lifetime? And the cost of paying for other land?
... likely less than the ~$13/W this cost to install, but that included NRE for three different styles of panel mounting. Standardizing would cut costs significantly.
There are solutions like this to most of Californias big intractable problems, and they're not done because some California laws and/or regulations make it impossible.
This is one reason I now live in Nevada, where pretty much everything is legal...
>It seems like it would be more effective to simply put all the solar panels in a field, and construct a cheap shade over the entire canal no?
Yes, absolutely. But if you try and do that kind of stuff and the regulators show up and kick you right in the dick. "You got a permit to put panels this land?" "Where's your environmental impact assessment for shading that canal?". And HN cheers.
But if you say you want to cover the canal with solar panels out comes the rubber stamp because that's what the powers that be want to "incentivize" this week.
Does the success of populists make a little more sense now?
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Power lines are made of aluminum and steel.
I seriously doubt that you can chain even 1/4 mile of panels together without destroying things. Thats already puting thousands of volts and hundreds or thousands of amps through the silicon. If you are making it all parallel you still need wiring between panels that can handle that. The cabling doesn't go away, it just moves.
Wouldn't there still be supports in a feild of solar panels? Are you sure that those supports + the supports for the shade material are going to be less material than the supports for this?
Most shade material wears out pretty quickly. Will their replacement result in more expense, more waste, etc than just putting the solar panels?
Shade material is generally pretty heavy, is it really going to need significantly less robust support? Weight aside, how much of the load those supports are rated for is due to the actual weight of the panels, and how much is for forces from things like wind?
Anecdotally speaking, I have heard of a massive California solar farm in an undeveloped area that has serious vandalism problems. Junkies will find ways through the fencing at night, strip copper and other materials from panels, and cause thousands in damages and lost energy just to extract enough scrap for a fix.
Nothing short of a face-to-face security response will deter these criminals, so there it is a challenging cost-benefit balance. At least panels in parking lots and other developed spaces have the benefit of witnesses. I'm sure a 20 foot climb up a steel beam over running water is a decent deterrent as well.