Sanyo 190 shading [RE-wrenches]

[Randy Sadewic]

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Kelly,
I saw a shading demonstration comparing this product to a multi-crystal
module at an eco-products fair in Japan during the time I lived there.
The relationship between shading and output of the Sanyo Heterojunction
module was linear ie 10% shading caused about 10% drop in output which
was substantially better than multi-crystal.

I asked Sanyo directly about this and received the following response:
"Here's the answer based on the exhibit model at Eco-Products Exhibit.
When we create partial shading on cells, polycrystal's motor activity
stops right away while HIT's doesn't stop. That is because HIT's
transforming efficiency is high. Transforming efficiency of mass
products are: HIT is 17% and polycrystal is 13%. It means the light that
can't move the motor of polycrystal could move HIT. However, if we shade
HIT cell completely, the motor would stop."    
Solar System Planning Section, Systen Dept. 
Masahiro Hosoda

In addition, the operating performance of the Sanyo module is superior
due to the lower coefficient of temperature to power.  I have attached a
spreadsheet analysis I did a while ago comparing the different modules.
The prices are fairly recent but out-of-date.

Have fun,

Randy
Positive Energy



-----Original Message-----
From: Kelly Keilwitz [mailto:kelly at whidbeysunwind.com] 
Sent: Friday, January 21, 2005 5:22 PM
To: RE Wrenches listserve
Subject: Sanyo 190 shading [RE-wrenches]


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Wrenches,
Is the Sanyo 190 module more tolerant of shading, because of the
thin-film layer, than single crystaline modules? We can't find any info
from the manufacturer on this.

We have a marine application where the customer wants to maximize energy
density on a pilot house. However, there will be soft shading from
antennaes, and a little hard shading from the superstructure. I'm trying
to weigh the output of the higher density, big modules, vs. a smaller
array of more, smaller modules in parallel given the shading issues.

Thanks,
-Kelly

Kelly Keilwitz, P.E.
Whidbey Sun & Wind
Renewable Energy Systems
986 Wanamaker Rd, Coupeville, WA 98239
ph & fax: 360-678-7131
sunwind at whidbeysunwind.com
www.whidbeysunwind.com
Renewable Energy Now!

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