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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance
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  #1181  
Old 06-21-2008
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We've talked about Nano Solar here before. Here is the latest from them.
VERY EXCITING.

Nanosolar Blog
The solar industry’s first 1GW production tool. Here it is:



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  #1182  
Old 06-21-2008
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Nice vid of the Reynold's Wrap line, Cam. (g)
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Old 06-21-2008
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Quote:
Originally Posted by camaraderie View Post
We've talked about Nano Solar here before. Here is the latest from them.
VERY EXCITING.

Nanosolar Blog
The solar industry’s first 1GW production tool. Here it is:




It is not a publicly traded company is it?
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Old 06-21-2008
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Pretty cool Cam.
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No way to buy in

Quote:
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It is not a publicly traded company is it?
No - privately held. Their website says that basically they don't need the money, since the process is so inexpensive.

I think it'll be a year or two before we see panels that can be used on a boat, more's the pity.
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Old 06-29-2008
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very cool, Cam

you would think that they wouldn't risk promulgating trade secrets in a you-tube video.
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  #1187  
Old 06-30-2008
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I don't think they are risking anything. They suggest that what they are doing is pretty conventional lithography, the kind any quik-print shop would do. Their "secret" is in the patented special "ink" and "paper" that become the solar panel as they set and cure.

What is curious from their web site is that they imply they could produce the material at 20x the speed they are doing now. And yet, their output for all of 2008 is already allocated and spoken for. With that kind of demand...I'd turn the throttle up to "11" and hire a second shift!
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Old 06-30-2008
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HS-

The production bottleneck may not be the actual "printing " of the solar panels, but the speed at which they can produce the ink necessary to print with. Upping the speed of the press only does you some good if you have enough ink to keep it running.

I used to work with Web Offset equipment. They don't do so good when they run out of ink. More wastage at higher speed too...cause if the press has a problem it goes through more material before you can correct it....so there are reasons not to go hell-bent for speed.

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Originally Posted by hellosailor View Post
I don't think they are risking anything. They suggest that what they are doing is pretty conventional lithography, the kind any quik-print shop would do. Their "secret" is in the patented special "ink" and "paper" that become the solar panel as they set and cure.

What is curious from their web site is that they imply they could produce the material at 20x the speed they are doing now. And yet, their output for all of 2008 is already allocated and spoken for. With that kind of demand...I'd turn the throttle up to "11" and hire a second shift!
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Old 06-30-2008
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I remain a skeptic. Not in their ability to print a solar panel, but in just how efficient it is.
1000 homes running off 10 acres - they don't mention the batteries to run the houses during night, but we'll skip that part.

That's 435600 square feet (10 acres), now one could assume that 1/1000 of that being 435 square feet one could simply paste a nanosolar array to the roof of an average house and power the puppy up. Of course you'd have to clean the roof daily to keep bird poop, leaves and such from turning off your Air conditioner.

If anyone could do that, they would have done it.
They cite a 14.5% cell effectiveness, IIRC the norm is close to 6%; if they are in fact twice as efficient.
Rough numbers, my 80w panel is roughly 7 sq ft, it would take 62 of them to cover 435 sq feet.
On a good day I've observed 3ah at 13.6v going into the batteries (the MPPT reduces the 16-17v down, ah up).
3ah x 62 = 186ah at 13v, rounding off in favor of them (and ignoring conversion to AC loss) we'll call that 18ah at 110v, and then we'll double that because they say their cells are more efficient.
40ah, 110v, per hour at best, curved over time (panel won't be 100 effective during all 10 hours of daylight) and let's be nice and say it makes 300 amp hours per day at 110v.

My fridge uses 13amp 13x24 = 312.

Nuff said? or is my math grossly wrong (I admit to being poor at math).

I'm not saying it's not good, just saying it's not ready, not without a whole LOT more efficiencies being applied pandemically.
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Chuckles-

You're confusing your units... panels don't put out amp-hours... they put out a certain number of amps at a given voltage. You get amp-hours by multiplying the output in amps by the number of hours it is capable of supplying that amount of current.

An 80W panel should be putting out more than 3 Amps at 13.6 volts. 13.6 x 3 = 40.8 watts. Your numbers are ignoring the fact that relatively fully charged batteries are going to draw less amps of current from the panels, and your batteries are probably close to topped off.

An 80 W panel should be putting out almost 6 amps (5.88 or so) at 13.6 V. This should give about 30 amp-hours or so to the batteries—since they average about the equivalent of five full power hours of output over the course of a day. If you had 62 panels, you'd get 372 amps or 1860 amp-hours @ 13.6 V.

If you convert to 120 V, you're going to get about 210 amp hours @ 120 V or so...ignoring voltage conversion losses and such. If we double it, you'll be getting 420 amp-hours at 120 V.
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