st do that?
>
>Dick
>
>
>
>--- You wrote:
>Dick:
>
>I too am mystifed. I sent a request for clarification but have not
>heard back. It may be some kind of power trip as we have been at odds
>over many issues. I will report back.
>
>William Miller
>Mill
An inspector can bump absolutely anything. That doesn't mean they've correctly
interpreted the code or made a decision that increases electrical safety, only
that they have the authority to call it anyway they like.
What constitutes a long DC circuit in a building? Ten feet, fifty feet? What if
it
William,
Not sure I understand how buried PV runs protected by touchsafe fuses in
combiner boxes at the array and GFCI protection at the inverters constitute a
fire hazard.
That's not saying I disagree with your disconnect here. I don't. If it was a 1kW
system, would you still install one? I would
William,
It is common in our area to install underground, unfused, transformer secondary
laterals. The utilities require 3 feet of cover and marker tape located 12"
below grade. I can't find a requirement for marker tape in the NEC. That's not a
reason not to use it. It's inexpensive & available
Lee,
The Sunny Island will shut down entirely to protect the batteries.
Dick Ratico
Solarwind Electric
--- You wrote:
Wrenches.
I have a customer with a stand-alone system with an XW inverter, XW
controller, pole mounted array of four 235-watt panels, and 4 of the
8D gel batterie
Amen.
Dick Ratico
Solarwind Electric
--- You wrote:
All,
I'm a little late on this thread, but wanted to give some contrary
experience. We have, maybe, 15 BFS watering systems out there, dating back 5
to 6 years. Although I've experienced some issues in getting watering
systems set up properly, o
Nik,
I haven't run into this myself, but...
I think what you have is not really split phase, but two phases, out of the
three available, from the three phase system in the main building. If that is
the case, those legs/phases are 120 electrical degrees apart, rather than the
180 degrees you would
Hi Ron,
One of our clients claims to be "sensitive" to exposure to EMR. I was initially
sceptical, but have come to believe that considerable variation exists in the
way individuals react.
In our case the objection was to a wireless modem.
Sensitivity to high frequency audio is likewise variable
Huh? DC Power Systems stocks "peel and stick" Unisolar in 4 lengths, from 9' to
18'. Under $3.00/W.
Great product. Performs well. Requires a standing seam metal roof.
Best look available in solar IMHO.
Dick Ratico
Solarwind Electric
Bradford, VT
--- You wrote:
The US-64's were on their site for 3
Seconded! AMEN.
Dick Ratico
Solarwind Electric
--- You wrote:
Steven,
A Line Side Tap, by nature, allows us 100% of the Service Entrance Conductor
Ampacity. This typically ~equals Main Breaker rating, but is regardless of
the Main Breaker rating or size of Loads, it's about the conductor. NEC
IMHO it seems like we're all really on the same page here.. trying to make
the the most out of the the resources we have available to work with..sun
hours, pv, copper, labor, dollars, etc. Job specifics come into play. There are
definitely times when a detailed cost/ benefit analysis is cal
Hi Dave,
Depending on the house loads, you might very well do without an additional (very
expensive) auto transfer switch. The inverters, of course, already have one.
Just leave the Sunny Islands connected 24/7. The transfer from grid to battery
is then milliseconds and flawless. The 56 amps cont
Peter,
May be mistaken, but I don't think "Tape" is mentioned specifically anywhere in
the code. What kind of splices do you have in mind? Not wirenuts I hope? One of
my pet peeves, sorry.
I don't have my 2008 Codebook handy. 2005 NEC Article 110.14(B) requires, "All
splices and joints and the fr
predicted, while resistance across connections was higher.
R. Walters
r...@solarray.com
Solar Engineer
On Apr 25, 2010, at 6:02 AM, Richard L Ratico wrote:
> Peter,
>
> May be mistaken, but I don't think "Tape" is mentioned specifically anywhere
in
> the code. Wha
0, at 6:02 AM, Richard L Ratico wrote:
> Peter,
>
> May be mistaken, but I don't think "Tape" is mentioned specifically anywhere
in
> the code. What kind of splices do you have in mind? Not wirenuts I hope? One
of
> my pet peeves, sorry.
>
> I don't hav
I second Mike's suggestion for sunglasses on startup. Wait, better go
for welding helmets. Those DC arcs are bright. And I bet they didn't use listed
electrical tape either! :-) Thanks for sharing this one.
Dick Ratico
Solarwind Electric
--- You wrote:
Typically those types of modules a
Wow, this could be a hairball. Needless to say, we've all probably already done
this, more than a few times. Butas a former carpenter though claiming no
expert truss knowledge, my sense is that the top chord of the trusses should be
in compression. Therefore, a 3/8" diameter lag, for instan
Just thinking out loud here.if we all sort of sit back and wait for the
flames, is that where we really want to be? Granted, the party responsible for
this debacle has dug their own hole, but I don't relish the thought of the waste
of a building, the danger involved in fighting a fire, the poll
My $0.02:
I like the idea of bonding all the electrodes with direct buried bare copper. I
always do it, typically with #4. I would use #2 if it were not so much more
expensive. These are residential jobs. If I had large job, like the subject of
this thread, no problem with the #2.
If you only have
Bill,
Your branch circuit breaker is pretty small.
Are you energizing both transformers simultaneously? If so, it might help to
energize them individually.
The branch breaker can be up to 250% of the step up transformer's primary
rating. 10kVA/240V=41A.
41A x 2.5=100A. (round numbers). To do this
tching I
might have better luck.
William Miller
At 06:23 PM 5/12/2010, Richard L Ratico wrote:
>Bill,
>Your branch circuit breaker is pretty small.
>Are you energizing both transformers simultaneously? If so, it might help to
>energize them individually.
>
>The branch breaker
buffering...
I wonder if I use a large solid state relay with zero crossing switching I
might have better luck.
William Miller
At 06:23 PM 5/12/2010, Richard L Ratico wrote:
>Bill,
>Your branch circuit breaker is pretty small.
>Are you energizing both transformers simultaneously?
ip in the input power result in another big surge
requirement?
Mick Abraham, Proprietor
www.abrahamsolar.com
Voice: 970-731-4675
2010/5/13 Richard L Ratico
> Sorry for the additional post here, but it includes a typo correction:
>
> Bill,
>
> Not a lot of personal experience with
Fronius 50 Hz unit with a stepdown transformer?
Dick Ratico
Solarwind Electric
Bradford, VT
--- You wrote:
Wrenches,
I need a 5 kW grid-tie inverter with 110VAC/50Hz output for a job in the
Caribbean. SMA 50Hz inverters are sold out for the rest of the year. Suggestions
please?
Best regards,
Joe
Jason,
Schott's large module series might work for you.
280W to 320W though.
Dick Ratico
Solarwind Electric
--- You wrote:
Can anyone help me find a 230W 48V module mfr/model? I am trying to meet
a firm specification for a single panel system to charge either 36V or
48V battery banks.
P.S. I'm
Does anyone have experience with the Morningstar Tristar-MPPT-60 charge
controller?
Thanks in advance.
Dick Ratico
Solarwind Electric
Bradford, VT
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William,
It's my understanding the SMA Sunny Island inverters do this as well.
Dick Ratico
Solarwind Electric
--- You wrote:
Darryl:
There is a scenario in which problems occur: If your loads exceed the
generator capacity, the Outback system will fail. The Xantrex inverters
are superior in
All,
For longer, underground, array to inverter/charge controller runs, are folks
using aluminum or copper?
Last time I compared prices, for the same ampacity, Al was 1/3 the cost of Cu.
Dick Ratico
Solarwind Electric
--- You wrote:
Hi Dana;
I'd say that's a bit overkill for today's market. Tha
Dana,
Thanks for the input. Excuse me please, "OG jobs" are?
If the wire had been copper and didn't melt, but instead continued to arc,
would the resultant heat have eventually started a fire?
What type of splice was it?
Does no one else use Al for DC? Here in rocky Vermont/NH,
we use the same
The insulation on Al cable rated for direct burial is thick and tough. But,
DON'T direct bury it. Carefully pull it into correctly installed PVC conduit.
Use marker tape above the conduit, just below grade.
If you're in an area that doesn't experience ground frost, MAYBE, VERY
CAREFULLY, plant the
Lee,
In Maryland?
Dick Ratico
Solarwind Electric
Bradford, VT
--- You wrote:
Wrenches,
Has anybody come across an analysis of the potential damage to a flat
roof from snow on solar modules melting to form an ice layer on the
roof and then forming subsequent layers as more snow melts or slid
Mick,
SMA has something:
http://www.sma.de/en/products/off-grid-inverters/smart-load.html
Dick Ratico
Solarwind Electric
Bradford, VT
--- You wrote:
Step three is most intimidating to me: We need a way to control 240 volt AC
heating elements in a fine pulse width modulated PWM fashion, to prote
Marco,
Here's a link to some info from Thomas & Betts. The table you're looking for is
at the bottom of the PDF.
http://tnblnx3.tnb.com/emAlbum/albums//us_lc_fittings/gm102_62_67_lc1.pdf
Or, call the electrical distributer you use. They may handle a different brand.
Dick Ratico
Solarwind Elect
Drake,
--- You wrote:
I called her back just now, and the voltage readings on the Mate, MX
and Trimetric all match. Humm.
The batteries are 4, 4 1/2 year old, U.S. Battery L-16s wired in 24
volt configuration. It seems that I remember postings of Wrenches
having problems with these batteries
Marco,
--- You wrote:
I looked at the Thomas and Betts spec sheet kindly supplied by Ratico on
their LB offerings and there was no notation of max conductor sizes that I
could find.
--- end of quote ---
Look again.
http://tnblnx3.tnb.com/emAlbum/albums//us_lc_fittings/gm102_62_67_lc1.pdf
It's
Marco,
If I understand your question, not sure I do, my answer is, there is no
requirement for such a relationship.
Repeat to yourself, what Darryl said:
Always check rotation either with a rotation meter or with a motor by bumping
the motor to check its rotation.
Dick says, ..Pay absolutely
Most Esteemed Wrenches,
Peak Copper?
Please read:
http://en.wikipedia.org/wiki/Peak_copper
http://en.wikipedia.org/wiki/Bauxite
http://www.guardian.co.uk/world/2010/aug/23/miners-trapped-alive-chile
There's a copper Superfund site 30 miles from my home here in VT.
Let's use our resources wise
Maybe another possibility if the generator is a non-starter:
1) Sealed Batteries (no maintainance) appropriately sized for the running load
only, no motor starting surge
2) Single Sunny Island 5048 inverter (the most reliable IMHO)
3) 6 kVA autotransformer (boosts SI output to 240V)
4) 240V single
Hi Nik,
Some questions:
Is this a 3 phase service?
Details on the UPS; brand, kVA, age?
Breaker sizes for the circuit(s) supplying the UPS and fan?
Details on the air conditioning system and fan. Are they powered through the
UPS?
Dick Ratico
Solarwind Electric
--- You wrote:
Wrenchers,
We i
Jeremy,
Not sure if this would work. but How about feeding the hydro output
into a large industrial battery charger or chargers. They are available in three
phase.
Modify the charger by eliminating the stepdown transformer. Basically what you
need is a rectifier. Then feed the resulting D
Have you called SMA directly? SMA has other neat stuff that's only available
outside the US. Apparently they don't think there's enough demand here to go
through the listing process.
Dick Ratico
Solarwind Electric
--- You wrote:
Wrenches,
A SMA CD with their 2009-2010 product guide has a Sunny B
Brian,
A GEC with no splices, or only irreversable splices, has only two ends. If you
need to find them to check their integrity, you know where to look.
No argument about acorn clamps. Exothermic welding might someday be required.
Dick Ratico
Solarwind Electric
--- You wrote:
Inspectors in Ariz
Hey Richard Dean,
Matt's post has a lot more tech in it than yours, which has zero. This list
already has a moderator, and a great one at that.
I look forward to every post of Matt's. He is exceedingly generous with his
knowledge, time, wisdom and wit.
If you don't like it, don't read it. Shs
Chris,
You've probably already considered and rejected this... Unisolar PVL modules on
standing seam roofing. Solves the structure & wind problems. Goes fast if
installed on the pans before they go on the roof. Price is pretty good per watt
now.
Can't beat the look. Made in USA. I think the only d
Chris,
You most likely recall, there was a thread here discussing special standing seam
attachment details required with the S-5 product.
With your weather, those might be critical for the roofers to follow, should you
go that route.
I was unaware of the white spotting from hail you've seen on th
Phil's post is right on.
What is the rafter spacing, 16", 24"? Is it really half inch plywood?
What does the grade stamp say? Half inch maybe works in western Washington,
maybe not in Montana or Vermont. Add point loads to 1/2 inch from the PV?
I don't think so. Block under the plywood with 2x6
If I remember correctly, we worked through this in 2008. A supply side
connection is NOT considered a separate service. And, seven disconnects is one
more than six, and is NOT code compliant.
Dick Ratico
Solarwind Electric
--- You wrote:
I've made similar observations as Matt before about adding
Hi Mark,
Having learned of Eternabond on this list, we've since used the doublestick
version on two, raised rib type metal roofs. Of course, it's way too early to
tell how it will perform over time, but we were quite impressed during
installation.
It's ferociously sticky. You'll want to place
Hi Kirk,
See 2008 NEC 225.30 thru 225.40. As I understand it, separate disconnects,
up to six for each array, located on the main building, are required and
appropriate.
Dick Ratico
Solarwind Electric
--- You wrote:
Hello,
I'm working on a system which will have 5 kw on an outbuilding and 20k
Hi Vince,
I don't know anything about Energy Recommerce, but a search of their website did
not result in finding an installation manual for their combiner box, only a
datasheet. You stated countless hours were spent on the phone with their
technicians. If it was my job, at this point, I would want
SolarEdge makes an optimizer / inverter system. We just installed one. Our
clients are happy. So are we.
Don't know if you can AC couple the inverter. Their website says they are about
to release a version of the optimizer that will work with other manufacturer's
inverters.
Dick Ratico
Solarwind
Allan,
I think most gennies bond the neutral to the chassis so the circuit breakers on
the gennie will trip in the event of a ground fault. If the neutrals weren't
bonded and the breakers didn't trip to clear it, there would be a shock hazard
on the chassis in the event of a fault. Not sure what yo
Jeff,
Here's a link to a dual lug accessory:
http://www.milbankworks.com/blog/wp-content/uploads/2013/03/NEAC.pdf
Page44
Dick Ratico
Solarwind Electric
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Ch
Jesse,
Trust your instinct. It's the best tool you've got.
Dick Ratico
Solarwind Electric
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Respectfully:
My Fluke 87 does not use this convention. Black is labeled the COMMON terminal,
the red terminal is labeled according to function, not polarity. Battery based
inverter manus. using this convention typically provide BOS enclosures with OCP
for only one inverter conductor. This require
k.
> > I have discussed this with many electricians over the years, but
> > eventually every single one sees that's its really easy, no cost, and
> > still code compliant to make things safer.
> >
> > R.Ray Walters
> > CTO, Solarray, Inc
> > Nabcep Certifie
, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 6/30/2013 9:58 AM, Richard L Ratico wrote:
> Ray,
> Conductors can be mislabled regardless of the system used. The accident you
> described had nothing to do with conductor color or labeling. I
Hi Benn,
No images but the ones in my imagination. The majority of arrays are viewed at
some distance, as in way up there on the roof. Most roofing materials are
dark colors. There's a good chance the few parts of the rails that are visible
at all, are less so than if they were silver. When gi
Bob-O,
Then again, SOME of us don't buy in Walmart either.
Just say'in. Sorry Michael. Couldn't help it.
Dick Ratico
Solarwind Electric
--- You wrote:
Then again, SOME of us don't buy Chinese goods.
On Aug 8, 2013, at 9:53 AM, Ryan wrote:
To echo Tom the XW is probably the best product for the
I've got two Hawker installs out here, a 48 Volt and a 24 Volt system. Both are
going on 6 years or so. Clients are happy, I'm happy. It does resemble work to
move and place them. We typically use "Egyptian" techniques when heavy equipment
isn't available or appropriate. Inclined plane, big pry bar
Allan,
According to Wikipedia, it is not a typo. It is, however, an excellent example
of lousy technical writing / documentation. You are correct to zero in on it
What Outback seems to have done, is switch from a four line drawing on the input
side of the circuit to a one line drawing on the outp
One out there, now about 7 years. Customers are happy. No problems.
Dick Ratico
Solarwind Electric
You Wrote:
Wrenches.
We have sold four Sundanzer chest refrigerators or freezers over the last ten
years. All have worked without a hitch. Today I got a call from a customer
asking about DC refrige
Nik,
Looks to me like there may be a major bird flyway between the dormers directly
over the bottom row of modules. A google search seems to confirm a correllation
between between bird droppings and copper roof staining. I agree with August,
this doesn't seem to be an issue caused by dissimilar me
As concerns standby loss, I can't speak to the others, but the Rinnai has a
simple on/off button on the front of the unit. A remote controller is available
which also provides the switch. It does take afew seconds for the unit to boot
up. Up to three remotes may be installed, making the on /off ope
Ron,
How do you propose to support the conduit between the poles should you run it
above grade? At what height above grade? What type of conduit? You say you are
interested in the industry best practice. Speaking as an licensed electrician
with 20 years experience, there's no question in my mind t
Thinking out loud here: Can you, 1) Use short pieces of the TC for the box entry
/exit. Butt crimp, solder, insulate / heat shrink USE-2 or PV wire to the
emerging TC tails. Or, 2) Can you modify the locknuts on the new 3/8" CGB by
grinding or cutting to reduce their diameter? Or, 3) Ditch the lock
Several years ago I was asked to troubleshoot two Fronius 3kW Inverters
installed by others on the same system. These had been orphaned by the original
dealer / installation company, which was very good at GROing and was no longer
servicing their residential work.
Fronius tech support was very hel
It would be interesting to be able to compare the failure rates of the two
systems, particularly if they will be installed in areas with challenging
environmental conditions. Boards may be lighter, but.If they add up, they
may not continue to feel that way.
Dick Ratico
Solarwind Electric
---
I watched most of the streaming video of Mike Holt and six PV industry
professionals this weekend. The most interesting aspect of it was Mr. Holt's
very dramatic build up to the Sunday discussion of Article 690.47(D) which
brings back the requirement for an auxiliary grounding electrode for PV arra
Bill,
You would do us all a great service if you would explain why, "The roof-mounted
requirement was a complete mistake--and
potentially dangerous in most cases." To the trained eye, as Doug Wells points
out, a rooftop PV array looks like one enormous air terminal. You guys are
agreeing it makes
Hi Troy,
I'm assuming this is off grid. Could you please provide details for the system
(inverters, batteries, etc.).
A single, sudden, 20 amp load is not necessarily small relative to the size of
the system. Is the load 120V or 240 V?
Dick Ratico
Solarwind Electric
--- You wrote:
On Sun, Feb
Ray,
Way back in 2002, you mentioned using Boltswitch products for battery string
fusing
immediately outside the battery box. Might one of these be a partial solution
for William?
Dick Ratico
Solarwind Electric
--- You wrote:
I'm working on something similar. I think the Flex 1000 is the only
William,
The rack in your photo appears to support modules that are not properly sized
for that particular DPW unit. They appear to be fastened to the rack at their
third points rather than their quarter points. I've never seen that before. All
the modules I've seen have been predrilled near their
It seems quite possible that a solar caused pulse could take out the grid
without affecting an off grid or battery backed grid tie solar system. In fact
it's already happened:
http://en.wikipedia.org/wiki/March_1989_geomagnetic_storm
Dick Ratico
Solarwind Electric
--- You wrote:
Good answer Wa
A client of mine suffered a mysterious shattered module on a DPW TOP rack. The
rack holds eight of these in landscape orientation. The one that broke was in
the lower, west corner of the array. The glass appears to be uniformly
shattered, with pieces approximately 1/4" in size. The glass has not st
William,
Would UL listed crimp sleeves be an acceptable substitute where you would
otherwise use wirenuts?
Dick Ratico
Solarwind Electric
--- You wrote:
Bob-O:
When you say verboten, what does that mean? Not kosher? Frowned upon?
Disallowed by law???
I am quite curious about this subje
I may be playing devil's advocate here, but I want to add a few thoughts. Jay, I
just looked at Fronius and SMA inverter data sheets. I found no spec. for an
output OCPD, only a spec for max. output current.
William, most inverters now come with integrated DC/AC discos. Dave, 2014 NEC
705.12(D)(1),
Drake,
It seems the code is providing some flexibility for the location of OCPD in
battery circuits. Placement "as close as practicable to the storage battery
terminals" is ok even if that is in an enclosed space (say a battery box) where
the possible accumulation of flammable gases may occur.
Dic
The "Skin Effect" largely explains why ampacity does not increase in a linear
fashion with increasing wire size. (http://en.wikipedia.org/wiki/Skin_effect)
Dick
Solarwind Electric
--- You wrote:
Taking Jarmo's example a step further, if you unroll the 3 wires so that
they are flat, place those
Howard,
A wye connection is BY DEFINITION grounded through the fourth wire. The wires
leaving that bar can be either grounded conductors (neutrals) colored white or
equipment grounding conductors, bare or green. Because you measure 277 V between
each line and ground, it would seem that you do have
--- You wrote:
Not to hijack the thread, but is there a company that anyone could recommend to
repair these controllers, or a source of wiring diagrams for them?
Dick Ratico
Solarwind Elecric
Hello wrenches,
Yesterday, we converted a Whisper 200 over from 24V to 48V operation. We
lowered the t
Darryl,
Check this out:
http://download.sma.de/smaprosa/dateien/4439/SL6000-11-EE2807_Internet.pdf
As far as I know, and I asked SMA directly 9 months ago, this is not presently
available in the US. I wish it was. I have two clients who could certainly use
one.
It would be great to get an update
Allan,
The timing of the problem certainly points to your high seasonal temperatures as
at least a contributing factor. What is your array voltage? If it is 24V, can
you relatively easily rewire for 36 or 48V?
Dick
Solarwind Electric
Bradford,VT
___
Bruce,
You may have already seen this on the Outback Users Forum, in the thread titled,
"How do I use every last electron?"
http://www.outbackpower.com/forum/viewtopic.php?f=29&t=2865
Most of the discussion applies to the FX60 & FX80, but I think there were some
tips for the MX60 as well.
Dick
Hi Nik,
I just ordered my first three, DS60PV-500, direct from Citel in Florida,
305-621-0022 or 800-248-3548. AEE lists them in their catalog, but when I tried
to order some, I was told they hadn't been able to get them yet.
According to the person I spoke with at Citel, they had no record of an
--- You wrote:
The post was intended to be off-list...
Peter,
I just re-read your reply and it still escapes me. ocd..._
--- end of quote ---
Obsessive-Compulsive Disorder.
Dick
Solarwind Electric
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Fellow Wrenches,
For MC cable "management", we recently used 1 1/4" Schedule 40 PVC conduit,
strapped loosely
(to allow for expansion/contraction) to the our top rack rail with SS pipe
clamps.
The conduit was drilled with a 1 1/4" hole saw every 18" or so to match the
spacing of the module pigta
:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Richard L
Ratico
Sent: Monday, December 15, 2008 10:55 PM
To: re-wrenches@lists.re-wrenches.org
Subject: Re: [RE-wrenches] SS Zip Ties
Fellow Wrenches,
For MC cable "management", we recently used 1 1/4" Schedule 40 PVC condui
Hi Drake,
Could you please elaborate?
Dick
Dick Ratico
Solarwind Electric
Bradford, VT
--- You wrote:
Hi William,
So is there no document we can read that delineates the actual
requirements? The standard methods of module bonding that we use
don't always seem logical. Engineers on a rec
Hi Drake,
Thanks for your detailed reply. Hmmm. Grounding / bonding always the most
misunderstood, confusing, controversial aspect of electrical work.
Some thoughts:
1) The NEC is a MINIMUM standard.
2) The NEC sometimes has to play "catchup" in the case of developing
Hi Drake,
I use the WEEB products whenever I can. I like the way they are an
aggressive, "toothy", stainless steel "filling",
in a nut, bolt, washer, locknut sandwich.
Having seen way too much lightning damage of late, and lots of
corroded mechanical lugs, it's great to have a bonding product
Hi Dana,
Maybe this is a place to start:
http://relays.tycoelectronics.com/datasheets/pd90x.pdf
Dick
Dick Ratico
Solarwind Electric
Bradford, VT
--- You wrote:
Hi Wrenches,
I have a quirky project where I need to toggle PV DC between grid-tie
inverters and an electrolyzer for a fuel cell syst
Hi Kirk,
I 'm pretty sure you can purchase it online in pdf format. The NFPA website
would have it.
Of course, if you have specific questions, we can try to help you out.
Dick
Solarwind Electric
--- You wrote:
Hello,
Is there anywhere on line to find the code book in pdf or other readable
f
Gentle men and women,
I don't quite understand the seemingly nearly universal aversion to FULL
DISCLOSURE of all prices: components, markup, overhead, travel, labor, whatever.
This is the good old US of A, where apparently, we're still afraid of saying the
taxpayers "own" the banks, even though w
Hi Joel,
Here's a link to utility requirements in VT as of 1/8/08.
See drawings #405 & #406 at the end of the document.
Looks like a PITA for existing structures where a backfed breaker won't work.
http://www.cvps.com/CustomerService/Book01-08.pdf
Dick
Dick Ratico
Solarwind Electric
Bradford,
Hi Allan,
There are a few listings for the SM55 on eBay right now.
Dick
Dick Ratico
Solarwind Electric
Bradford, VT
--- You wrote:
Any old 50W Solec modules laying around? I need one to replace one that has
failed on a tracker. 13" X 51", 1998 era. An Arco or Siemens M55 would
probably work ou
Hi Peter,
I have installed a lot of RMC. You may have also. It is my opinion that
a well secured run of this conduit, installed in this manner,
could take the hit you describe and still protect the enclosed conductors.
--- You wrote:
(2) They also disallow a rigid conduit run anywhere on the e
Hi Drake,
Dont know why not. Meet code as much as possible:
1) AWG of the lightning down conductor adequate?
2) Use non reversible, listed connector to splice array SGEC
to down conductor
3) Do you need an additional ground rod? Resistance to earth OK?
4) These rod/rods need to be bonded to t
Chance,
The wrenches list is also available as a searchable archive, where this subject
has been previously discussed / debated at length. Rather than chastising Bob-O,
you might thank him for bringing this to your attention and also to the
attention of anyone else reading the list, public or pro.
Bob,
I agree with Allan re. Tek screws. They are what the steel roofers use.
As concerns your rail spacing relative to the "ribs" in the roof, I think you
have a fair amount of flexibility there.
Maybe, avoid the ribs altogether by varying the rail spacing accordingly, rather
than rigidly adheri
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