Show Time!

John was just about worn out when I talked to him, yesterday.  He’s at the big solar show in Salt Lake City.  Sun Electronics does not have a booth, there.  He’s there to hobnob and network, catching up with old friends and keeping up with the latest offerings.

All of the panel makers are there, including the Chinese, who are not selling a lot of modules owing to the tariffs.  I’m sure each maker is emphasizing that their panels are blacker, less reflective and .001% more efficient than the panels in the next booth!  Not to say that all panels are created equal…they aren’t.  That’s a good thing because there are special applications.  In the next day or so I will write about some renegade panels I have come across and how to use them.

So, there he is, shuffling down the aisles, gawking, trading business cards and peeking in on seminars.  They have modules, inverters, batteries and every conceivable gadget and gizmo related to solar and what do you think catches his eye?  A racking system.

John recently had the opportunity to buy a small solar farm.  Not just the panels, everything.  Right down to the last nut and bolt.  Even the galvanized iron posts ripped from the ground with balls of concrete around the base.  I   would love to get ahold of stuff like that, but there is a problem.  Shipping.  It costs more to ship it than it is worth.

That’s really a shame.   Rather than reuse a perfectly good item, it is cheaper for them to sell it as scrap and have it melted down to make something else.  In the meantime, I can go to the local steel supplier, cut and drill the raw materials and  get busy mounting panels on the new rack.  How can that possibly make economic sense?  How much energy is involved in all that?

Yup, shipping is a real problem for us little guys.  Roberto just sold me a pallet of panels at a super low price.  I didn’t need them, just can’t pass up such a bargain.  Then there was the reality of a $500 shipping tab.

Well, this racking product that so impressed John is completely modular, meaning it is adjustable so it fits with any module AND it fits in a package you can ship UPS.  Hooray!  We’ll see if he can work out a deal to carry that line.

Another racking product I saw in show literature is a rackless system you can use on a commercial building with standing seam metal roofing.  These little assemblies slip on the seam, you space them just so, snug them up and drop on the solar panel.  Saves materials and labor costs.  Great ideas.

New product news from my morning solar newsletters and not the Utah show has to be the worst idea ever.  In addition to the current thin film offering that last a long time and the crystalline modules that seem to last forever, there are many other ways of getting power from the sun at much greater efficiencies.  The problem with most of these is that they do not last very long.  Some last only a few weeks.

The idea is that if they can get a super efficient panel to run 10-15 years, it may be economically feasible to build these disposable panels and just swap them out every 10 years!  Now, I understand that land is expensive and if you can get more power out of an acre you can save some money.  What about the cost of labor?  What do you do with the scrap panels?  It takes a lot of energy to make a panel and a lot to melt it down and start over.  Why not just make forever panels and leave them alone?

I don’t think this idea is being promoted for rooftop, but imagine having to replace your home PV system every 10 years?  I know when I get my new roof, I am going to get the best I can find and I really don’t want anybody stomping around up there wearing it down.

Besides, what does that do to the secondary market?  You won’t be able to have such a broad choice of used panels at low prices that you have today, at least ones that actually make electricity.  My thought on PV recycling is USE IT!  Run it until it fades to nothing.

Speaking of recycling, someone has come up with a strange new idea to make it easier to recycle modules.  You grind up a tree and make a cellulosic substrate on which to apply the active material and all the silver wires.  Sounds like paper, to me, but cellulosic substrate sounds more impressive.  Anyway, a hailstone cracks the glass or some other problem arises and it is time to recycle.  Simply soak the panel in warm water and the cellulosic substrate dissolves and all of the valuable or tricky materials slide off into your waiting hands, leaving the glass and aluminum frames available for conventional recycling or even reuse.

Wait just a minute.  MY modules are out in the weather every day, not that it ever rains in September.  Do I really want a panel that dissolves when it gets wet???  I’m thinking there is a detail or two they didn’t mention in the press release.  At least they are trying.

As far as my recycling efforts go, I just ordered a pallet of those FS-270 panels John is offering so cheap.  70 watt used thin film panels for $7!  I’m bound to find something to do with them.  Heck, I bet they’d make great stocking-stuffers come Christmas, birthday presents or even something for a kid’s science fair project.  Ummm, maybe not, as they have an open circuit output of 83 volts.  It is never a good idea to electrocute the nieces and nephews.  Anyway, they look like good, cheap fun.  Check them out on the sunelec.com home page.

–Neal