Sanyo 190 shading [RE-wrenches]

Kelly Keilwitz kelly at whidbeysunwind.com
Wed Jan 26 17:24:57 PST 2005


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Hi Randy,
It sounds like what they are saying is that partial "soft" shading on the
HIT cell/module doesn't affect it as much as multi-xl. However, if a
complete cell is shaded it will still shut down the series string output,
same as single xl. Am I interpreting the techno-speak correctly? I seem to
have misplaced the book that covers "transforming efficiency of
mass"........:)

The spreadsheet was stripped from your email by Topica. Would you
please send the spreadsheet to me off-list?
Thanks,
-Kelly


----- Original Message -----
From: "Randy Sadewic" <randy at positiveenergysolar.com>
To: <RE-wrenches at topica.com>
Sent: Tuesday, January 25, 2005 9:00 AM
Subject: RE: Sanyo 190 shading [RE-wrenches]
> 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 The prices are fairly recent but out-of-date.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-----
> 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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