Great! Source? NREL redbook? RE: Number of EC-110's in Series? [RE-wrenches]

[kanzer at evergreensolar.com]

Great, John, thanks.  You answer was clear and fine and no need for apology.
Do you suggest any other source than the NREL redbook?  Please reply to the
list AND me.  Thanks!

-Bill

-----Original Message-----
From: John Berdner [mailto:jberdner at sma-america.com]
Sent: Monday, June 09, 2003 1:08 PM
To: RE-wrenches at topica.com
Subject: Re: Number of EC-110's in Series? [RE-wrenches]


Bill:

Several things here and I am swamped.
Please forgive my brevity.

1) Only working email address is jberdner at sma-america.com.  No more
earthlink.
2) I suggest using the historical low to calculate max Voc.  Remember
we are talking about 30 plus year system life.  You can see full Voc
long before the modules have enough sun to heat them.
3) High ambient use average high.  Hot modules only effect power
production and do not cause an inverter failure. If the system falls off
the MPP point or even shuts down once or twice a year it is no big deal.


Regards,

John Berdner

>>> kanzer at evergreensolar.com 6/9/2003 09:24:21 AM >>>

NOTE: Please don't reply to the Wrenches list unless you're on it
(you'll
know).  If you're on it, please DO reply to me as well as the list.
Thanks!

John,
(For your reply, please reply to all.)

How do you pick the low ambient temperature for design?

I just spoke with Jeffrey Wolfe, who in turn had spoken with Paul
Lyons,
about the right number of Evergreen EC-110 modules in series for an
SMA-2500U 240.  In going to your website, I see that it's a maximum
of 24 in
Series if the low ambient temp is chosen as -4F (-15C), max 23 in
series
if -13F (-25C) is chosen, and max 22 in series if
-31F (-35C) is chosen.  I also remember you saying that you would
damage the
unit by going over the VOC and therefore the low ambient limits in
your
sizing program are HARD limits, not to be violated.  What temperature
do you
recommend for various locations and in what source do you find them?
For
example, the NREL 'redbook' shows the lowest average minimum daily
temperature of the year in Boston as 21.6F (-5.8C) something we'd
probably
consider ordinary.  The same source shows the record minimum
temperature
as -11.9F (-24.4C), something we'd consider extraordinarily cold.

The same questions about source would apply to the high ambient
temperature
for design, but there you said that all that would happen is you'd
move off
the max power point, right?  How much instantaneous power loss would
that
cause?

I look forward to your reply.

Thanks!

-Bill

William M. Kanzer
Marketing & Sales Manager
Evergreen Solar, Inc.
kanzer at evergreensolar.com
www.evergreensolar.com
259 Cedar Hill Street
Marlboro, MA 01752-3004
TL: +1.508.357.2221 x714
FX: +1.508.357.2279

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