All,
I've just updated the inverter firmware (to version 7.302) in an off-grid
120/240 Volt split phase Sunny Island, generator only system I installed in
2007. It's my understanding the Sunny Islands DO need an external shunt if if
there are any DC loads or charging sources. I don't have any of
Hi Folks,
Would anyone having experience with one of the new railless racking systems care
to comment?
Dick Ratico
Solarwind Electric
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Mac,
Try Boltswitch. http://www.boltswitch.com/pdf/135.pdf
Dick Ratico
Solarwind Electric
--
--- You wrote:
Hi REwrenches,
Does anyone know where I can get a UL listed battery combiner good for
1500A DC, 48V, preferably with a shunt?
Does this exist?
Thanks
--
Mac Lewis
--- end of
Wayne,
Never had an entire array fried. My experience consists of a total of less than
10 modules out of a total of maybe 50 at two different sites. One site had the
much more common (these days) modules with leads and diodes potted in an
epoxy-like material. We use a Dremel tool with a burr bit
Hi Allan,
Like you, we now design for larger arrays and smaller batteries, but have not
yet tweaked CC settings as well. Our Vermont weather is a bit different than
yours to say the least, though tweaks may still be something to consider.
Batteries do use more water. I've installed, and will
Hi Wrenches,
Can anyone recommend a commercially available, ground mount array racking system
with an adjustment range of 30 to 90 degrees. Ideally this would be easily
accomplished by one person.
Here in Vermont, in winter, the 90 degree, vertical orientation can provide
satisfactory production
-Original Message-
From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On
Behalf Of Richard L Ratico
Sent: Wednesday, May 20, 2015 1:33 PM
To: re-wrenches@lists.re-wrenches.org
Subject: Re: [RE-wrenches] Array easily adjustable from 30 to 90 degrees
Hi Wrenches,
Can anyone
Ray,
In VT and NH, at least, electrical apprenticeships are defined and regulated by
the state. Apprentices must be registered and enrolled in approved formal
coursework as well as meet specific employment requirements for paid, hands on
work in the field.
Dick Ratico
Solarwind Electric
--- You
I had a similar bad experience with Fronius. I was initially told they would cut
me a check. When it came down to it, that changed to a an offer of a credit for
future Fronius products purchased through my distributer. They owed me $500.00.
I didn't bother with their credit and have only sold /
1/2 HP, 120V SQ. Going on 20 years or so. No problems. Great pump.
Dick Ratico
--- You wrote:
How long do these stay in the hole before the need to be maintained or
replaced? Do they last as well as standard AC deep well pumps?
--- end of quote ---
___
Dan,
It's surprising the lower two rows of modules did not heat up sufficiently to
melt completely clear once most of the snow had been removed. In my experience
any remaining layer of ice starts melting immediately once the sun reaches the
cells and they begin to warm up when they start
--- 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
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
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
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.
Dick
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
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
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
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
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
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
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
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
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
---
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
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
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
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
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
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
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
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
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
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. It was caused by
a
gross violation of sound
, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 6/28/2013 2:49 PM, Richard L Ratico wrote:
Respectfully:
My Fluke 87 does not use this convention. Black is labeled the COMMON
terminal,
the red terminal is labeled according
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
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
And perhaps, size each of the conductors for the entire 95 Amps.
Dick Ratico
Solarwind Electric
--- You wrote:
Use a good pin to lock them together. Make sure they can't
disengage (lock-tite the hardware, etc.) and you're good to go.
Stay warm out there (ha!).
Dan
--- On Wed, 2/27/13, Larry
Huh? The equipment does not take or draw anything. The electrical pressure
of the source, called voltage, forces electrons through the load. Electrons per
unit time are called current. The current is only limited by the resistance of
the load, in accord with Ohms Law. The resistance of the load
The code provisions regarding conductors in parallel [2011, 310(H)(I)] are very
specific and make complete sense. When installed correctly, in larger sizes, 1/0
or greater, as permitted, there is very little likelihood of significant
difference in resistance or any other problem. This is done
Rich,
If I understand your question, I think you're missing the functioning of the
inverter. Working independently of the charge controller, it will sell to
prevent overcharging the batteries. Correctly configuring the inverter's voltage
thresholds accomplishes this.
Dick Ratico
--- You wrote:
: [RE-wrenches] Grid tie with BB
From: richard.l.rat...@valley.net (Richard L Ratico)
Date: Sun, September 02, 2012 9:16 am
To: re-wrenches@lists.re-wrenches.org
Rich,
If I understand your question, I think you're missing the functioning of the
inverter. Working independently of the charge
Could the battery SOC be the reason you see the module current at 60% STC
rating?
Dick Ratico
--- You wrote:
I've seen 1300 sustained at 6000 feet and 1800 edge of cloud too.
Brian
Typos courtesy of my iPhone.
On Aug 29, 2012, at 1:56 PM, Nathan Jones solardud...@yahoo.com wrote:
William,
The transformer creates a Separately Derived System. You need to bond the the
neutral, and the equipment ground there or at the first Disconnecting Means,
which would be the combiner panel. The chosen bonding point must also be
connected to a grounding electrode. Per2011 NEC 250.30.
It would be good to know how much energy the wind turbines have been producing,
if any, if that information is even available. Eight batteries per inverter? Two
separate banks? They installed the system? DIY? In any event, it sounds like a
situation you want to approach with caution. The crux of
Kirk,
Notaguru or a gutter, but it sounds good to me.
Dick Ratico
Solarwind Electric
--- You wrote:
Hello transformer gurus,
I am in the middle of a good sized PV job and we need to use a 75 kva
480/208 3 phase transformer (standard delta to wye) to connect the 208 3
phase output to the
Eric,
Your production numbers don't seem that unreasonable to me, comparing actual
numbers with STC. That said, there may still be a problem.
We just repaired 4 - BP SX150S modules. The owner said they were, about 10
years old. These had a 1 inch x 4 inch x 1/2 inch encapsulated / potted
Agreed, two of the four modules we repaired had orange hot spots.
Dick Ratico
Solarwind Electric
--- You wrote:
Look for burnt or hot spots near the top of the modules under the Jbox area. We
have replaced a lot of modules of that age
Ameresco solar is supposedly making the replacement modules
John,
Thanks for that clarification. One question: What is PSOC? Partial State Of
Charge?
Dick Ratico
Solarwind Electric
--- You wrote:
Jason, Wrenches,
Thank you for your patience and positive statements on Trojan Battery Company.
Last week was a busy and I was away from my desk most of the
Agreed, more clarity would be a good thing. To keep things in perspective,
you can only get so far trying to protect people from themselves. This past
Friday I found
a GE 30 Amp single pole breaker protecting #12 conductors (and not feeding a
motor). The same
panel probably contained 4 different
Yo Wrenches,
Some of you might wish to checkout:
http://spaceweather.com/
A new, very large sunspot has the potential to unleash
some powerful CMEs almost directly towards Earth.
Dick Ratico
Solarwind Electric
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spaceweather.com is an informative site. I check it daily.
Dick Ratico
Solarwind Electric
--- You wrote:
I have been following this lightly [ha] and the last time we went into this
level of solar activity in the late 1800's there were telegraph offices that
literally burst into flames. At
Wrenches,
Does anyone have experience with Helios Modules they wish to share?
Thanks,
Dick Ratico
Solarwind Electric
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Options settings:
Bob,
You must mean an Outback FM80 charge controller. There have been issues with
these. I've had to swap 4 of them for firmware updates.
Outback, (and some others), don't notify us when there are problems with their
products.
Have you checked out the Outback User's forum?
Does anyone have any experience with Kestrel Wind Turbines?
Dick Ratico
Solarwind Electric
--- You wrote:
SWWP has changed their turbines again. They are now called the the Air 30, Air
40 and Air Breeze. The 30 is like the old X land, the 40 is like the old Breeze
Land and the Breeze is like
Can someone please explain why this is a bad practice? My understanding is
the fuse will still prevent backfeeding a fault by more than one additional
string,
the one paired by the Y connector. All the other strings are downstream of
the fuse.
Dick Ratico
--- You wrote:
Wrenchers,
Has anyone
Larry,
Would it not be better to connect the Honda directly to the the Sunny Islands?
Use a manual transfer switch to choose between the grid and the Honda. Then, in
an extended outage, your client could charge the batteries with it and turn the
darn thing off once in awhile. Maybe you could
Fellow Wrenchers,
A while ago I received some greatly appreciated advice from some of the members
here. I thank you all again, as well as Michael Welch and the others who help
keep this list going.
The issue at the time was a Y2K BBGT system with an SW4048 and a dead battery of
8 Trojan L-16s.
Chris,
Perhaps you'll find this island's experience of interest:
http://www.isleofeigg.org/eigg_electric.html
Dick Ratico
Solarwind Electric
--- You wrote:
Ray,
The idea that the utility in an island is seeing an advantage to having PV
on the grid is a huge concept for me. As I am based in
Jeffrey,
On the load side of the Fused 200 Amp Service Disconnect there is a splice or
splices or distribution block in the conductors which feed the 5 subpanels. It
seems quite possible that one or more of those conductors or the distribution
block could see the sum of the current from the grid
Mac,
You have already received great advice, different strokes for different folks.
Three things I would add:
Accepting an offgrid customer is a bit like getting married. It is a long term
commitment. You want it to be a happy one. What does that mean to you?
In my experience it is prudent to
of batteries.
OK you asked,
jay
peltz power
On Nov 17, 2011, at 4:03 PM, Richard L Ratico wrote:
Hi Wrenches,
This is a repost. No replies the first time, so I'm trying one last time.
I may be adopting an eleven year old, Y2K, grid tie with battery back-up
system. It consists of 12 - Astro
Todd,
I asked Surrette about their lead calcium batteries this morning, right after
reading your post. Here's their reply:
I'm afraid our flooded calcium line is not yet available. Product testing went
very well but at this time our present high demand for our other product lines
has prevented
Hi Wrenches,
This is a repost. No replies the first time, so I'm trying one last time.
I may be adopting an eleven year old, Y2K, grid tie with battery back-up
system. It consists of 12 - Astro-Power 120 modules, installed in 2000, 12 -
Evergreen EC-110 modules installed in 2004, only one MX60,
Fellow Wrenches,
I would welcome some feedback on this one:
I may be adopting an eleven year old, Y2K, grid tie with battery back-up
system. It consists of 12 - Astro-Power 120 modules, installed in 2000, 12 -
Evergreen EC-110 modules installed in 2004, only one MX60, which controls BOTH
I may be missing something here.. but, for a manual switching solution, why
not use two standard 600V DC discos. Put the PV to the top of both, load side of
one goes to the battery inverter, load side of the other to the grid tied
inverter. Turn one off, turn the other one on. Not as elegant
Hi Joel,
I've done business with these folks. Good products and fast service. They
probably have everything you need.
http://ledsupply.com/
Dick Ratico
Solarwind Electric
Bradford, VT
--- You wrote:
Wrenches,
Who is a good supplier of low-power consuming individual LEDs. Thank you
very much
Hi Jeff,
Perhaps of some help, from the SMA German website:
http://files.sma.de/dl/5615/INSELNETZ-PL-UEN105010.pdf
Dick Ratico
Solarwind Electric
--- You wrote:
Thanks for the input! Was nice to see you at Intersolar.
WELL This is the Bahamas so it's the Canadian Code. So let's say
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
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
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
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
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
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
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.
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
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
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
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
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
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
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
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
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
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
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
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
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.
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
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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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.
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,
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 can be up to 250% of the step up
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? If so, it might help to
energize
power result in another big surge
requirement?
Mick Abraham, Proprietor
www.abrahamsolar.com
Voice: 970-731-4675
2010/5/13 Richard L Ratico richard.l.rat...@valley.net
Sorry for the additional post here, but it includes a typo correction:
Bill,
Not a lot of personal experience
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
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
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
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
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 free
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