Friends:
I am considering the option of installing power quality monitoring equipment
at a facility. The system is three phase 120/208 Wye. I need to monitor
for voltage, frequency, sags, dips and flicker.
Can anyone recommend anything that can do this?
Thanks in advance.
William
Hi Mac, all;
Since Colorado just adopted NEC2014 July 1, I have not heard any AHJ
stories yet. But look at 690.12 (1):
"Requirements for controlled conductors shall apply only to PV system
conductors of more than 5 ft in length inside a building, OR more than 10
ft from a PV array."
(my emphasis on
Hey Mac,
1. What is a (currently listed) rapid shutdown system that will
accommodate 8 strings? I know I can do this with Midnite combiners but as
I understand these aren't listed yet.
Contacting combiners from several mfgs or Midnite combiners would work.
Everything in PV systems pretty mu
That’s correct it’s a manual disconnect and I agree it totally defeats the
purpose but some AHJ’s are accepting that it’s within 5’ of entering the
building and nowhere in the code does it say it has to be readily accessible.
We had one AHJ make us put the disconnect on the side of the house abo
Hi Don,
You might want to check with your distributors to see if they have the old
Power-One equivalent to the VSN700 data logger. I know that these are
available because I just bought one for a new project. The PN is VS701 – N0
(called Aurora Logger). We’ve installed a few of these with good re
Hi Will,
Yes I'm sure AHJ's will be all over the place for a while here in Colorado.
To clarify, is this a manual disconnect in the attic? If so, that is
really missing the whole idea of a rapid shutdown.
Thanks
On Wed, Aug 27, 2014 at 7:47 AM, Will White
wrote:
> Our experience in MA with
I wrote an open source library called solpy to explore some of these
issues. https://github.com/nrcharles/solpy It's not user friendly but you
can watch the DC power available at the array. It implements the CEC
inverter model and when I matched it up with Enphase's 5-minute data it
tracked fairly
Our experience in MA with rapid shutdown unfortunately varies with AHJ. Some
are letting us put an Eaton NEMA 4 disconnect on the roof next to the array.
Some are letting us put a disconnect in an accessible attic within 5’ of the
penetration. Some are requiring the Midnight Birdhouse remote
Hello wrenches,
I am still trying to wrap my head around how to comply with rapid shutdown
in off-grid and hybrid situations. I've got a few questions that maybe you
can help with.
1. What is a (currently listed) rapid shutdown system that will
accommodate 8 strings? I know I can do this with
Rebekah,
My understanding was that PVsyst modeled inverter nominal power not
maximum power. I believe this helps to compensate for inverter
temperature limitations. For instance, depending on inverter location and
power ratio, I would suppose that there may be instances where the
simulation coul
10 matches
Mail list logo
