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
Hi All,
Does anyone know of a link to the old Trace 2624 inverter/Charger (the one
with the plexiglass front. I believe the model number was U2624, but I'm
not positive. I'm trying to remember what the maximum bulk voltage
setting was on it. Also wondering how sensitive to lower gennie voltage
o
Again Thanks Bill and David;
Continued excellent information.
I just jumped on Solectria'a string sizing online tool, and what are
they using for the Vmpp coefficent? just a tiny bit higher than the Voc
coefficient. SMAs new design tool just lists the Voc coeff. I think
some manus might nee
http://www.copper.org/applications/electrical/building/pdf/rooftop.pdf
³ASHRAE bases its ³warm-season temperature conditions² for each city on
annual percentiles of 0.4%, 2 %, 5% and 10%. As an example, the June 2.0%
dry-bulb design temperature for Atlanta is 91.7°F. Therefore, based on a
30-day m
Ray,
There is an explanation on the www.solarabcs.org/permitting webpage for the
interactive solar map. The 2% ASHRAE data represents 14 hours in a
month-meaning temperature will be at or above that value for 14 hours in a
typical month. This is likely to correspond to at least one 3-hour timefram
Ray, I'd use the 2% high temp. The 0.4% high temp would only be reached
a few hours out of the year. However, the 0.4% high is only a few degC
warmer than the 2% high, so that would change my fudge factor below by a
max of 1.8-2.0%.
On 2011/12/1 15:48, Ray Walters wrote:
That's more detailed
Thanks Orion,
Most of our work in the winter is in the Caribbean and Mexico and they
all use 60 hz. I appreciate it, though.
Daryl
> Daryl,
>
> We have not had any hands on experience yet with the Radian series
> inverters, and only minimal interaction with the MATE3. But since you
> mentio
ASHRAE temp data as applicable to PV can be found (with some digging) on the
Solar ABCs website.
http://solarabcs.org/about/publications/reports/expedited-permit/map/map_int
ro.html
-Glenn
-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists
Ray:
Look at Appendix F in the Expedited Permit Process for PV Systems - A
Standardized Process for the Review of Small-Scale PV Systems Prepared
by Bill Brooks, P.E. Brooks Engineering
This document provides the ASHRE temperatures for a lot of locations
around the USA.
http://www.solarabc
That's more detailed info, but I still am wondering what ambient temp to
apply (which AHSRAE #) with the temp adder. Daryl suggested using a 2%
high temp. Also, where are you all getting your weather data? I found
the NEC suggested ASHRAE manual to be close to $200. That's a bit much
just t
Daryl,
We have not had any hands on experience yet with the Radian series
inverters, and only minimal interaction with the MATE3. But since you
mentioned that your systems would be out of country I thought I would
bring up the fact that the Radian inverters only come in 60Hz models, no
50Hz outpu
Hi all,
We are looking at a busy winter season and there are several systems
I'd like to size using OutBack's Radian. These are all out of the
country jobs and I would be interested in any experiences anyone has
had so far installing and/or using these seemingly great inverters.
I would likel
At 12:16 -0700 30/11/11, Larry Crutcher,
Here's a scenario: Sun is up and voltage rises slowly to the
diversion controller set point. PWM starts and maintains the
voltage. Current continues to increase but the load is keeping the
voltage constant until the controller is overloaded.
I think th
At an SMA training last year they recommended the following temperature
adders:
Open field: +22°C
Rooftop, lots of ventilation: +28°C
Rooftop, some ventilation: +29°C
Rooftop, little ventilation: +32°C
Rooftop BIPV, no ventilation: +43°C
Façade, some ventilation: +35°C
Façade, little ventilation
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