To my understanding the 156% on PV source and output circuits is related to
the ability of PV to deliver more than rated and be continuous.
Therefore, the wire has to be able to carry this current, so now the
temperature and fill corrections are applied to find the wire capable of the
156%.
I
Erika,
You should refer to NEC 690.8 this information. There are two issues
that contribute to the 1.56 factor. First is that the maximum current
from the PV array is considered the short circuit current multiplied by
1.25 to account for higher than standard irradiance such as cloud edge
eff
Eirka:
Although the Imp is your normal operating condition, you need to design
wire size for an abnormal occurrence (short circuit or other fault). You
do not want the wire to burst in to flame after an unplanned short circuit,
do you? Remember, you may have combiner fuses, but you have no o
Erika,
The most correct answer (which is a really funny thing to say) is to use
John Wiles' "5-step program"-that's what I call it. It is published in one
of the appendices of his latest "Suggested Practices" document. If you can
actually follow what he leads you through (that's why I call it t
Erika,
The most correct answer (which is a really funny thing to say) is to use
John Wiles' "5-step program"-that's what I call it. It is published in one
of the appendices of his latest "Suggested Practices" document. If you can
actually follow what he leads you through (that's why I call it t
I recently bought a 345.
It is a great tool - I use it on every commercial commissioning and QA
inspection I do.
I had a customer with high utility voltage and the meter recorded this very
well.
Interesting to watch the voltage and current measurements on a residential
PV install when the inverter
I believe that the breakers from CBI, Midnite and Outback are hydraulic /
magnetic and may be operated at 100% While the derating applies to all
others that are Thermal / magnetic,
Bob
On Fri, Apr 2, 2010 at 11:14 AM, Kent Osterberg wrote:
> Erika,
>
> You should refer to NEC 690.8 this informa
Yes, they are 100% duty rated. Also, a little-known fact about the CBI
breakers used by Midnite and Outback, gleaned from conversations with
Robin Gudgel: because of this hydraulic/magnetic construction, all are
capable of controlling both AC and DC, even if not listed as both.
Wrenches,
I need 5 Astropower (or GE) APX-140 or equivalent 36-cell modules to replace
customer's broken modules. Please contact me off-list. Thanks in advance.
Best regards,
Joel Davidson
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Since the new micro-inverters can be easily wired into the nearest 240 VAC circuit, odds are this will be the new do-it-yourself project for homeowners. However, odds also favor new round of outlaw solar systems that are not inspected, do not have properly sized wires and breakers, and do not have
Erika
you are correct, the solar radiance can exceed STC by about 125%, any one who
has spent any time with a pyrometer has observed this. From experience's
continuously operated circuits fail fasted than intermittent circuits. for
the temperature and conduit fill, they are valid of course
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