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Posted by Rob Dekker on September 8, 2005, 5:25 am
 


wrote "around 140 EUR/m^2", so the US is still very

Sorry. Isn't one Euro worth like $00 now ?
Just kidding.

Any way, 140 EUR / m^2 is nice.... $50 / m^2 would be better..
Do you have a link to some providers with lower cost, good quality panels ?
Here is an American provider ($59 / m^2), in full 'flashy' style folder :
http://www.solarroofs.com/pdf/10-01Customer.pdf



an aim! If one has economy in mind, it might not be

Well, I think the time has come.
Around $000 for a 4m^2 (4 persons in a home) system, there is a real market.
And we are almost there....


heating is about 70 Cts/liter. I don't know about

the same, more than 2 times than the US.

1 m^3 natural gas in Holland is now almost 50 Cts EURO retail price.


more people think twice before using the car, and


Posted by Christian Kaiser on September 8, 2005, 2:44 pm
 
Rob,


I don't think it will be useful for you, concerning the costs of transport
or - as the internet shop I bought it from do - you might have to fetch it
yourself ;-)

Very interesting that here in Germany (www.ebay.de), a lot of the offers are
thermal collectors or systems (or other parts thereof), I did not find and
in the US eBay (www.ebay.com), which very much reflects what we read here!

http://cgi.ebay.de/Aufdach-Solar-Kollektoren-fuer-Solaranlage-0-EUR_W0QQitemZ5997851809QQcategoryZ83800QQrdZ1QQcmdZViewItem

http://cgi.ebay.de/Marken-Solarkollektor-ECOSTAR-III-mit-315-EUR-Foerderung_W0QQitemZ5996933596QQcategoryZ83800QQrdZ1QQcmdZViewItem

http://cgi.ebay.de/Solaranlage-4-6m-300L-Wolf-Heiztechnik-TopSon-F3-Neu_W0QQitemZ5997264368QQcategoryZ30567QQrdZ1QQcmdZViewItem

and others. Maybe you find a way to translate the info (babelfish or such)?

There MUST be a market in the US...


... with only 0.866 m^2 for $59!
... with very little information about the insulation on the back (which is
6 cm rock wool or such usually), or did I overlook it? I guess there's none,
so usable only in the southern part of the US or during summer time.
... no glass, but polyacrylic surface (I myself prefer glass, but I have no
experience for a real comparison)

The ones I have are (I have the "Q" version for horizontal placement, but
the technical data is the same):

http://www.sunfiction.de/pdf/Kollektoren/Kollektor_SFK270A.pdf
(from: http://www.sunfiction.de/Datenblaetter.htm )

(see the maximum temp of 220 deg C "Stillstandstemperatur"="stagnation
temperature" compared to 120 deg C of the one mentioned by the US firm- I
guess that's due to the missing isolation? But at least the "absorbtivity"
is the same (95%))

The manufacturer of my panels has English information:
http://www.sun-master.at/

Christian



Posted by Rob Dekker on September 13, 2005, 7:16 pm
 Thanks again Christian,
The "stagnation temperature" indeed says something about the quality.
At least about the heat losses.
You have good quality collectors there.

I found one California supplier that is in the ballpark of these prices
(or actually a bit below), and also has a much more 'down-to-earth' website :
Sun Ray http://www.sunraysolar.com  has collectors which look to be pretty decent
quality :
Aluminum frame, all-copper absorbers/tubing and tempered glass covers.
A 4'x10' (3.5 m^2) collector goes for $26, which is about $50/m^2.
We are getting close (for my target $000 system)...

I wonder if anyone made a web-site with all (US) commercial solar heating system
providers.



- as the internet shop I bought it from do - you

thermal collectors or systems (or other parts

reflects what we read here!

http://cgi.ebay.de/Aufdach-Solar-Kollektoren-fuer-Solaranlage-0-EUR_W0QQitemZ5997851809QQcategoryZ83800QQrdZ1QQcmdZViewItem

http://cgi.ebay.de/Marken-Solarkollektor-ECOSTAR-III-mit-315-EUR-Foerderung_W0QQitemZ5996933596QQcategoryZ83800QQrdZ1QQcmdZViewItem

http://cgi.ebay.de/Solaranlage-4-6m-300L-Wolf-Heiztechnik-TopSon-F3-Neu_W0QQitemZ5997264368QQcategoryZ30567QQrdZ1QQcmdZViewItem

cm rock wool or such usually), or did I overlook it?

summer time.

experience for a real comparison)

technical data is the same):

temperature" compared to 120 deg C of the one mentioned by

"absorbtivity" is the same (95%))

http://www.sun-master.at/


Posted by nicksanspam on September 13, 2005, 9:53 pm
 

...$3/ft^2, which doesn't include pipes, pipe insulation, pumps,
antifreeze, heat exchangers, controls, and a big storage tank
with a limited lifetime.

A solar pond heater might cost less than $/ft^2, with fewer accessories:
$ for 2" of foamboard below and above, 3 layers of 5 cent poly film, 30
cents for an EPDM layer, and $ for a 1" plastic pipe heat exchanger.

Nick


Posted by Christian Kaiser on September 14, 2005, 8:51 am
 Rob,

Better, but still only 1" insulation. ;-) And: does a Poly-Isocyanurate
persist two decades of the temperatures that the collectors have? The max
temperature of that insulation material is about 300 deg F (150 deg C) -
pretty near to the stagnation temperature, or even below it for good
collectors.

Christian





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