Inverter and Modulel Spreadsheet [RE-wrenches]

John Berdner jberdner at sma-america.com
Mon May 7 08:55:39 PDT 2001


Joel:

Please seend me you email address and I'll send it off.

Best regards,

John Berdner

-----Original Message-----
From: Joel Davidson [mailto:joeldavidson at earthlink.net]
Sent: Monday, May 07, 2001 6:41 AM
To: RE-wrenches at topica.com
Subject: Re: Inverter and Modulel Spreadsheet [RE-wrenches]


Hi John,
Your techical info is always welcome. Spreadsheet please.
Best regards,
Joel Davidson

jberdner at sma-america.com wrote:

> 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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