[RE-wrenches] SMA Sunny Design temperature/voltage calculations

[Brian Teitelbaum]

Yep. I miss the old version too. It was very useful for evaluating system designs.

The new one is much less useful, although likely more accurate. I like that it lets you change tilt angle and azimuth. But it's very clunky when trying to see alternative designs. I also wish that it automatically brought in the location's temp specs when you add a city to the input field.

I'd like to see both of them available on the website.

Brian Teitelbaum
AEE Solar


-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Joel Davidson
Sent: Friday, December 02, 2011 7:46 AM
To: Howie at CatamountSolar.com; RE-wrenches
Subject: Re: [RE-wrenches] SMA Sunny Design temperature/voltage calculations

Howie,

Thank you for speaking up.

SMA, please bring back the old string sizing program. Please.

When John Berdner introduced the SunnyBoy and showed us the spreadsheet (I 
got version X3.13 in 2003), it answered all our temperature, voltage and 
power questions. When the string sizing program went on-line, it literally 
changed system design. You could quickly do what-ifs and try different 
inverter, module and strings to meet site and requirements.

Wrenches speak up. Hopefully SMA will do the right thing and put that 
oldie-but-goodie back on-line.

Fröhliche Weihnachten
Joel Davidson


----- Original Message ----- 
From: "Howie Michaelson" <howie at suncatchervt.com>
To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
Sent: Thursday, December 01, 2011 9:17 PM
Subject: [RE-wrenches] SMA Sunny Design temperature/voltage calculations


Apropos to the great discussion about temperature voltage calculations,
has anyone else been frustrated by the removal of output information on
the Sunny Design tool compared to the old on-line string sizing
calculator?  It was very useful to me to have the string sizer show the
temperature voltage calculations for low and high temperature - as far as
I know the only string sizing application that showed this info.

The defunct online sizer allowed me to quickly look at a variety stringing
options, see the impact on voltage, narrow down the possibilities and then
run my own voltage calculations to verify.  Sunny Design makes quickly
scanning various string options not so easy, and it buries the results
behind more obscure output info.  It is quite a sophisticated program, but
I wish they gave a way to see the calculations behind the choices it
makes.  Or am I just missing something?

Howie
-- 
Howie Michaelson
NABCEP Certified Solar PV InstallerT

Catamount Solar, LLC
Renewable Energy Systems Sales and Service
VT Solar Electric & Hot Water Incentive Partner
http://www.CatamountSolar.com
802-272-0004





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