Inverter and Modulel Spreadsheet [RE-wrenches]

[jberdner at sma-america.com]

Dear Wrenches:

I have been reading your posts on # of modules for what inverters, etc.
As luck would have it, the latest issue of Photon magazine has a pretty
comprehensive list of all the module data.
It has mechanical dimensions, Isc, Voc, Vmp, and all the coefficients all in
one big table!
This includes a bunch of European modules we can't get over here in "The
States"

I want to be sure of the accuracy of the data so I asked SWTDI to verify the
module data for me.
I am in the process of creating an Excel speadsheet that should make it a
little faster to do module calculations.
For now, it is quick and dirty based on your guesses for highest and lowest
ambient temperature.
It's a work in progress but if anyone wants a copy please let me know
offline and I'll Email it to you.
I would really appreciate any feedback to help me develop a better version.

The guys at SMA in Germany have developed a great sizing tool (Excel
spreadsheet) but it only has German weather data.
Ideally I'll find a way to import the weather data directly from the NREL
database into the SMA Speadsheet.
Now where did I put that round tuit and time stretcher.

If you have any questions or I can be of any further assistance please do
not hesitate to contact me.

Best regards,

John Berdner

SMA-America, Inc.
20830 Red Dog Road
Grass Valley, CA  95945
Tel: 530.273.4895
Fax: 530.274.7271


-----Original Message-----
From: Joel Davidson [mailto:joeldavidson at earthlink.net]
Sent: Saturday, May 05, 2001 8:27 PM
To: RE-wrenches at topica.com
Subject: Re: PV Inverters module strings (Last Call) [RE-wrenches]


Comments below.

Carl Emerson wrote:

> Joel Davidson wrote:
>
> > Last call for your input on Trace Technologies inverter rough (first
> > pass) design series string count. Any changes, additions or corrections?
>
> Hullo there...
>
> I re-read the correspondence on this issue and am not convinced we have a
> consensus regarding supplying Trace with such a list.
>
> What is the purpose of the list?

Purpose of list: For designers who want to do a system quick calc for power,
energy and price estimate.

>
> Did Trace request it?

No. From my perspective Trace likes to remain neutral to module
manufacturers
which is good (no favoritism) and bad (no design data).

>
> Will it eventually appear in Trace literature and therefore indirectly
> promote some solar panel brands and not others?

I can't speak for Trace, but the only time in recent memory I can remember
Trace listing brands is with the TCB10 and a lot of people are thankful for
the list.

>
> Why do we have a wholesale exclusion of Canon/Unisolar?

No module is excluded. Every module manufacturer who wants to do major PV
projects should chime in on this list. More choice is better. (Uni-Solar is
no
longer a part of Canon.)

>
> Will the list include product to be released next year?

What products are being released next year?

>
>
> I think it would be much better for Trace to spell out the electrical
> criteria to be met and leave the array design to the engineers.

Other people share your opinion, but I do not.
signed,
Joel Davidson, Member
Institute of Electrical and Electronics Engineers

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