Kaneka GSA? [RE-wrenches]

Travis Creswell, Ozark Solar ozsolar at ipa.net
Mon Aug 21 15:22:38 PDT 2006


Is that what you do?

Travis Creswell
Ozark Energy Services

-----Original Message-----
From: Damian de Caires [mailto:damian at thesolarcenter.com] 
Sent: Monday, August 21, 2006 10:39 AM
To: RE-wrenches at topica.com
Subject: RE: Kaneka GSA? [RE-wrenches]


Why not save on the combi switches and just use y connectors

-----Original Message-----
From: Travis Creswell, Ozark Solar [mailto:ozsolar at ipa.net] 
Sent: Monday, August 21, 2006 11:14 AM
To: RE-wrenches at topica.com
Subject: RE: Kaneka GSA? [RE-wrenches]


Thanks for all dialogue about these modules.  I really appreciate it.
I'm
learning a lot.

Let's see if I'm getting this so far.

There is not an appropriate sized fuse available so you can't parallel
the
modules without a combiner box.  SMA's website says the Combi-Switch can
do
4 strings.  Assuming your local climate will allow 5 in series that's
300
watts per string x 4 strings for a total of 1200 watts.  If the inverter
allows two inputs you could use two Combi-Switches and double that. Now
you've got over $1k retail just in Combi-Switches for 2.4 kW system.  I
see
they also have Sunny Central Combiner boxes but with that product won't
you
need a disco in between the combiner box and the inverter (some string
inverters have one built in).  Any ideas what a 20 string Sunny Central
Combiner costs?  What size of fuse is required in the combiner box if
you
aren't paralleling?  There seems to be some disagreement on the actual
rating of the module.

After one buys some sort of combiner and does the extra labor to fiddle
with
all the strings the Kaneka's lower price per watt likely loose their
attractiveness for grid tied systems.  Since they are thin film type
product
your racking cost is going to be approximately double.  ~2x the ft2
required
for the same wattage array as crystalline. 

For less then 150vdc systems there is a solution.  But there is still a
fair
amount of labor involved to get to a sizeable array.

Thanks,

Travis Creswell


-----Original Message-----
From: Jeffery Wolfe, Global Resource Options
[mailto:jeff at globalresourceoptions.com] 
Sent: Monday, August 21, 2006 6:09 AM
To: RE-wrenches at topica.com
Cc: Travis Creswell, Ozark Solar
Subject: RE: Kaneka GSA? [RE-wrenches]


We worked with Outback awhile ago to get some 3A circuit breakers for
their stuff for use with Kaneka. They now have them, 150VDC, 100% rated.
So if you're using Kaneka with batteries (lots of wiring) you can string
in 2 parallel strings at least though one CB. No similar solution for
the higher voltage of grid-tied.

Jeff

Jeffery D. Wolfe, P.E.
Global Resource Options, Inc., Solar Energy Solutions
-----Original Message-----
From: Bill Brooks [mailto:bill at brooksolar.com] 
Sent: Wednesday, August 16, 2006 5:04 PM
To: RE-wrenches at topica.com
Cc: 'Travis Creswell, Ozark Solar'
Subject: RE: Kaneka GSA? [RE-wrenches]


So Matt,

What would the appropriate fuse rating be for two series strings in
parallel? 

Assuming the Isc is 1 amp, then Imax = 1 amp x 1.25 = 1.25 amp
[690.8(A)].

Therefore you must subtract the 1.25 amps from the 5 amp rating so the
max fuse rating is 3.75 amps

Two strings in parallel have a max current of 2.5 amps (1.25 x 2), and
the minimum series fuse rating is 2.5 amps x 1.25 = 3.1 amps [690.8(B)].
So the correct number is 3.5 amps.

The only fuse allowable for this arrangement of two strings in parallel
is a
3.5 amp fuse. I'd be interested to see if they have this in their
literature.

Bill.


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