ssage-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of boB
Gudgel
Sent: Sunday, December 28, 2008 5:07 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Inverter with two strings of different
orientation
Peter Parrish wrote:
Bill,
I
-boun...@lists.re-wrenches.org] On Behalf Of Peter
Parrish
Sent: Sunday, December 28, 2008 3:54 PM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] Inverter with two strings of different
orientation
Bill,
I looked into this several years ago, and I was able to get some digitized
I-V data. I
wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Mark Frye
Sent: Monday, December 29, 2008 10:39 AM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] Inverter with two strings of different
orientation
Peter,
What are you modelling for annualized s
Date: Mon, 29 Dec 2008 11:32:42 -0700
From: "Starlight Solar, Yuma, AZ"
I have pondered this problem often. Here's my thoughts: If you could
disconnect the two orientations and monitor them simultaneously, in
the morning the easterly array would have a higher Vmp while the
westerly array woul
erter with two strings of different
orientation
Thanks Bob, these are really great reference articles. The equation for Vmp
had four terms, three of which are temperature dependent. So I think we put
that issue to bed. The reason that this issue is so important for us is
this: if Vmp is temperature
I have pondered this problem often. Here's my thoughts: If you could
disconnect the two orientations and monitor them simultaneously, in
the morning the easterly array would have a higher Vmp while the
westerly array would necessarily be lower. This relationship would
change throughout the
-wrenches
Subject: Re: [RE-wrenches] Inverter with two strings of different
orientation
Peter Parrish wrote:
> Bill,
>
> I looked into this several years ago, and I was able to get some digitized
> I-V data. I can't find that now (but I will). The data supports my claim.
>
Peter Parrish wrote:
Bill,
I looked into this several years ago, and I was able to get some digitized
I-V data. I can't find that now (but I will). The data supports my claim.
Vmp does change with irradiance. It just changes very little. Depends
on your definition of "change" I guess.
Neg
Bill,
I looked into this several years ago, and I was able to get some digitized
I-V data. I can't find that now (but I will). The data supports my claim.
Let's take the simplest case (constant cell temperature) and what was a
fairly popular PV module: Kyocera's KC200GT. Although it is a little
Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Peter
Parrish
Sent: Friday, December 26, 2008 11:53 AM
To: k...@vtsolar.com; 'RE-wrenches'
Subject: Re: [RE-wrenches] Inverter with two strings of different
orientati
eter
Parrish
Sent: Friday, December 26, 2008 2:30 PM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] Inverter with two strings of different
orientation
I was afraid that the ultimate resolution would be another software cost
item. I'll look into PVSYST, and consider purchasing it if it is a
27;
Subject: Re: [RE-wrenches] Inverter with two strings of different
orientation
I was afraid that the ultimate resolution would be another software cost
item. I'll look into PVSYST, and consider purchasing it if it is a
professionally-developed and maintained product, with pre-and post-sales
RE-wrenches'
Subject: Re: [RE-wrenches] Inverter with two strings of different
orientation
Peter and Darryl,
The right way to do this is using a computer program PVSYST ($800). It will
calculate the operating voltage of each string and the overall performance.
Not much else out there can calc
-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Peter
Parrish
Sent: Thursday, December 25, 2008 11:04 AM
To: daryl_so...@yahoo.com; 'RE-wrenches'
Subject: Re: [RE-wrenches] Inverter with two strings of different
orientation
Thanks, Dary
-boun...@lists.re-wrenches.org] On Behalf Of Darryl
Thayer
Sent: Thursday, December 25, 2008 7:39 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Inverter with two strings of different
orientation
If each string is composed of only one orientation then there would be
little loss. There have been a couple of p
string has two
orientations then much larger losses occur.
Daryl
--- On Wed, 12/24/08, Peter Parrish wrote:
> From: Peter Parrish
> Subject: [RE-wrenches] Inverter with two strings of different orientation
> To: "'RE-wrenches'"
> Date: Wednesday, December 24, 20
I don't think this topic has been dealt with in this forum. Ocassionally we
want to use a single inverter with two or more strings, each string being
loaded by a single sub-array. A sub-array being defined as having a single
uniform tilt angle and azimuth. All modules are identical. And each
string
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