Hi Jeff:
I am familiar with that installation you mentioned, which runs all of the
buddhist prayer wheels. We have added an additional 100 KW of PV at that site,
and at the new temple, Cintimani. Those Kyocera modules that were installed
there failed. I found that about 1/3 of the modules
Peter and Larry,
Brian's post was correct and consistent with the 2011 NEC. It is not correct
to apply both 1.25 factors on the dc side. This has been done for years, but
it is inconsistent with the rest of the code. Conditions of use are only
applied to maximum current-defined by 690.8(A) as r
Very good. Thank you Peter.
On Fri, Feb 11, 2011 at 2:44 PM, Peter Parrish <
peter.parr...@calsolareng.com> wrote:
> Short answer: DC/PV side two factors of 1.25; AC side one factor.
>
> Reasons: the common factor of 1.25 is due to the treatment of PV systems as
> continuous sources of power, the
Short answer: DC/PV side two factors of 1.25; AC side one factor.
Reasons: the common factor of 1.25 is due to the treatment of PV systems as
continuous sources of power, the second factor of 1.25 is for the "cloud
effect". It is entirely possible to get more than 1,000 W/m^2 on a PV module
if the
To add to Brian's well formulated response, the 2011 NEC is much more
detailed and accurate on this subject. Oversizing wire is not a big deal on
residential systems, but it is prohibitively expensive in megawatt jobs.
Bill.
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenche
So you pick a conductor size from 310.16 (90 deg column) and then adjust for
conditions of use. That number has to be greater than Isc x 1.25.
OCPD has to protect Isc x 1.56.
On Fri, Feb 11, 2011 at 2:18 PM, Brian Mehalic wrote:
> Maximum current is defined in 690.8(A) as Isc x 1.25.
>
> Minimum
Maximum current is defined in 690.8(A) as Isc x 1.25.
Minimum OCPD size is defined in 690.8(B) as maximum current x 1.25 (Isc x
1.56). The maximum size, for PV source circuits, is the module maximum
series fuse size.
Required conductor ampacity is the greater of Isc x 1.56 or Isc x 1.25 with
all
I recently went through the same exercise as you are about three months ago.
Our Site Surveyors had mangles the jack on the Model 100 body to the point
that there was less than a 50% chance that (1) the unit would charge up
adequately and (2) we could download the session to our computer.
The fix
In studying for NABCEP certification I am a little confused about whether you
multiply the short circuit current by 1.25 once or twice (1.56) in order to
calculate maximum circuit current in determining wire size. Same for
overcurrent protection.
I have always done it twice (1.56) for both PV s
Yes, very sensitive to nearby EMFs.
And the bugger mistakes clouds for shading!
marco
Wrenches,
I'm considering upgrading my old SunEye 100 to the model 210 this year. Even
with the trade-in credit, the 210 costs more than the original SunEye did.
I'm interested in hearing from those of yo
Wrenches,
I'm considering upgrading my old SunEye 100 to the model 210 this year. Even
with the trade-in credit, the 210 costs more than the original SunEye did.
I'm interested in hearing from those of you who have taken this step. Is it
worth it? What are the most significant benefits to you?
Whi
Jay is correct about the economics, but sometimes we must live with them as the
only way to increase daily water production. However when the tracker fails
they will not be making the daily need anymore and it is far more likely to be
left dead than even batteries. In developing communities I ha
12 matches
Mail list logo
