We have had good luck with Snake Trayhttp://snaketray.com/solar/ from Cable
Management Solutions.
Comes in Galv and Stainless, 2 x 2 or 4 x 4
[NYLE LOGO SMALL]
Mark Richardson
mrichard...@newyorklightenergy.commailto:mrichard...@newyorklightenergy.com
From:
Fellow Wrenches,
No stones from this Missouri P.E. Perhaps if more Greybeards gave such
candid comments it might influence others toward something other than a
race to the bottom.
Bill Loesch
Solar 1 - Saint Louis Solar
314 631 1094
On 24-Mar-13 12:07 PM, Ray Walters wrote:
Hear, Hear,
Does anyone know of an efficient calculator tool to help compare diesel /gas
generator to PV + batt + small generator for an off-grid vacation house?
Regards,
Erika
___
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List Address:
Erika - HOMER (http://www.homerenergy.com/) is a hybrid power system modeling
tool for on- or off-grid applications. There is a 2 week free trial period and
then it costs $100 for a 6 month software license. I haven't used it yet but
have heard good things.
- Andrew Truitt
Sent from my
Marco,
I still challenge those who believe that “some clipping is good” to make their
case.
Well, the way you've phrased it, you've made my job pretty easy-- though
it seems to me that several folks have already done this for you.
Some power limiting at some point over the 25-year life of
Also, Windy Dankoff's old spread sheet that I adapted calculates
generator run time per week, and Maui SOlar software does a good job of
calculating generator hours per year. I've used Homer and found it to
be pretty far off from off grid reality.
Any off grid application is going to benefit
To add to Andrew's comments
There are legacy versions of Homer developed by NREL that are free but
unsupported and updated available at the same website.
Good Luck
On Mon, Mar 25, 2013 at 7:37 AM, Andrew Truitt atru...@gmail.com wrote:
Erika - HOMER (http://www.homerenergy.com/) is a hybrid
+1 for Maui Software. It is really helpful for finding the
array-to-battery-to-generator capacity sweet spot. You can also use it to model
things like the impact of various generator start/stop triggers. If you have
monthly kWh meter readings for the site, you can build a daily average load
I totally agree with Ray.
Generator scheduled maintenance is a huge issue that I have not seen
quantified monatarily.
The dire de-rate factors from every piece of software and every
spreadsheet we've tried seriously underestimate actually off grid
system performance we measure in the bush --
Forgive my senility. I recently read somewhere about development of grid-tie
inverters without batteries that offer emergency power via a single 120V
receptacle during grid outage (and sun.)
Anyone seen anything on these? The brands mentioned were SMA Mitsubishi.
Thanks in advance.
--
Nicholas
Hiya Nick,
SMA is bringing out an inverter that will do that. Not yet available, I think,
but hopefully soon. I heard about it at the NABCEP CE conference this month in
Sacramento, CA. I don't think it is specific to using the Mitsu PVs at all.
Bob-O
On Mar 25, 2013, at 8:56 AM, Nik Ponzio
http://www.smainverted.com/2013/02/21/groundbreaking-new-feature-on-sunny-boy-tl-us-emergency-power-when-the-grid-fails/
On 2013/3/25 11:56, Nik Ponzio wrote:
Forgive my senility. I recently read somewhere about development of
grid-tie inverters without batteries that offer emergency power via
SMA is hosting a webinar on this product line on April 2nd:
http://www.sma-america.com/en_US/smasolaracademy/seminar-calendar/seminar-registration/seminars/sunny_boy_tl_us_series_eps_overview_live_webinar.html
On Mar 25, 2013, at 11:11 AM, Bob-O Schultze wrote:
Hiya Nick,
SMA is bringing out
Larry,
Thanks for your reply. For some reason the schematic I received from the tech
at Atkinson did not show any wires being connected to pins 9 10 and as I'm a
literalist I did not make those connections. After I received your (and other)
feedback I connected gen power to those pins and the
when i have seen this (battery post melting) in the past it was from a faulty
(high resistance) battery connection... usually a poorly crimped lug.
todd
On Monday, March 25, 2013 9:15am, SunHarvest e...@harvesthesun.com said:
Larry,
Thanks for your reply. For some reason the
Hi Eric,
The only time I've seen battery terminals melt down was when they (the bolts
and cables) were loose, either from corrosion or not tightened in the first
place, and a fair amount of current was then drawn on the battery bank or
put into the battery bank as a charge cycle will do.
Hi Carl, Marco, and Wrenches,
As a longtime installer, I understand your point of view. Historically, I
designed my string and microinverter systems with the same consideration
for maintaining conservative DC to AC ratios. That being said, the costs
of modules have decreased significantly and
We typically bring the electrical up through the roof under the array for best
aesthetics. We have been using SLBs and plumbing style flashing for years with
good results.
However, in recent times the panel frames have been leaning towards thinner
frames. The result is that the plumbing
I believe that Zilla and Quick Mount makes flashed options for conduit entry
through the roof. You will still have to use a SLB but they are much lower
profile than the Oaty flashings used in the past and should fit under thin
framed modules.
Aaron Mandelkorn
NABCEP Certified PV Installer
Eric:
The generator-based charging may impose higher currents into the batteries
than either PV charging or inverter consumption, triggering the problem.
Melted battery terminals are not uncommon. You must have washers under
your bolt heads with lead flanges. Otherwise the bolt heads sink
Yes, Southwest Florida. You're right about the availability of modules.
People look at me like I have three heads when I tell them a 185W and a
250W module are about the same price, but that's the world we're living in.
We always need to consider price efficiency in addition the the electrical
and
I concur with William's recommendations and would add a couple of things.
Only use stainless steel hardware for all battery connections.
Wire brush connection surfaces prior to mating.
Use corrosion inhibiting grease on all fittings after making them (to seal out
air).
Lastly, It is a good idea
I think you will find it difficult to adhere to Article 392 and use a cable
tray on a rooftop with source circuit conductors, if that is your hope.
-Glenn
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Chris Mason
Sent:
What part of 392 would be a problem?
On Mon, Mar 25, 2013 at 6:12 PM, Glenn Burt glenn.b...@glbcc.com wrote:
I think you will find it difficult to adhere to Article 392 and use a
cable tray on a rooftop with source circuit conductors, if that is your
hope.
** **
-Glenn
** **
392.3(B)1
This was also pointed out in a recent article in Solar Pro talking about
Wire Management issues.
From: Chris Mason [mailto:cometenergysyst...@gmail.com]
Sent: Monday, March 25, 2013 6:17 PM
To: glenn.b...@glbcc.com; RE-wrenches
Subject: Re: [RE-wrenches] Cable tray
What part
Uses permitted. 392.10(B)(1) requires that single conductor cable in cable tray
be size 1/0 or larger.
Here's the deal, though. NEC 2014 will add Service Entrance Cable: Types SE
and USE to Table 392.10(A). It is not in that table now, which is why
inspectors turn to 392.10(B). That means that
David:
This is great news. Now, whenever I want to do something that is
prohibited by code, I can just say that the Code Making Panel is gonna
correct that pesky code section (insert your problem citation here) any day
now, so I might as well be allowed to do whatever it was I was fixin' to
Again, don't have any inspectors, so it is down to me to decide if the use
is reasonable and safe.
On Mon, Mar 25, 2013 at 6:46 PM, David Brearley
david.brear...@solarprofessional.com wrote:
Uses permitted. 392.10(B)(1) requires that single conductor cable in cable
tray be size 1/0 or larger.
Ouch. I promise I'm not advocating for anything like that. What I may be
missing is the Code reference that says no cable tray on roofs or similar.
There is so much room for improvement in wire management practices, that being
able to use cable tray seems like a step forward. I understand some
All,
Here is the language that has been accepted into the 2014 NEC:
690.31(C)(2)
(2) Cable Trays. PV source circuits and PV output circuits using
single-conductor cable listed and labeled as Photovoltaic (PV) wire of all
sizes with or without a Cable Tray marking/rating shall be
Thanks Bill. That's another welcome change to look forward to in NEC 2014.
On Mar 25, 2013, at 9:53 PM, Bill Brooks wrote:
All,
Here is the language that has been accepted into the 2014 NEC:
690.31(C)(2)
(2) Cable Trays. PV source circuits and PV output circuits using
The zilla flashing looks perfect. Thanks!
thanks,
Troy Harvey
-
Principal Engineer
Heliocentric
801-453-9434
tahar...@heliocentric.org
On Mar 25, 2013, at 1:37 PM, Aaron Mandelkorn reoso...@gmail.com wrote:
I believe that Zilla and Quick Mount makes flashed options for
David:
Of course, I understand that you are not saying we can willfully disregard
the Code in anticipation of future clarification. I was just extrapolating
on your idea.
If we want an exception based on a predicted update in the code, we are at
the mercy of the AHJ who may or may not be
William,
I would strongly disagree that conduit is tried and true on rooftops. I have
rarely seen good conduit runs on rooftops. Most electricians have no clue
how to work with expansion joints. Conduit on rooftops is a bad idea in
general. Most conduit runs in big buildings are all done
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