[RE-wrenches] AFCI Solved, Wet rated wire

[William Miller]

Friends:

 

I found the problem:  There was a damaged wire immersed in water in the
conduit.  The voltage was fluctuating at the inverter end and solid at the
module end.  After testing the Isc a few times the conductor burned through
and I was able to pull one end out of the conduit.

 

So, the inverter was doing its job.  We still have some wire nut splices
which are working fine.  I will eliminate them once I replace all of the
wire, which is warranted since this is the second conductor failure.

 

The conductors are all TWHN-2 which are wet rated.  I need to upgrade to a
better conductor. I have never had this type of failure at any other
location.  I suspect I should consider USE-2.  I'd appreciate comments on
this subject.

 

My thanks to Steve Jefferson for personal attention to this problem and to
everyone who responded.

 

And lastly, I still wonder about the concept of "internally arcing" wire
nuts.  I wonder if there is any scientific basis for the claim.  I will not
be using them in PV circuits on general principles.  If I do need to splice
I will probably use a gangable tubular terminal block.  There are more parts
to this connector than a wire nut so maybe those might arc.  We will see.

 

William Miller

 

 

Gradient Cap_mini
Lic 773985
millersolar.com  
805-438-5600

 

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Re: [RE-wrenches] Combining Multiple Inverters

[Jason Szumlanski]

705.12(D) reads, "... the interconnection provisions for the
utility-interactive inverter(s) shall comply with (D)(1) through (D)(7)."
That's inverters - plural. The interconnection must be protected by
dedicated OCPD, not each inverter individually. Microinverters comply
because of this interpretation.

That said, I've never done it. An accumulator panel is pretty cost
effective when you consider the alternative cost of an enclosure and the
Polaris connectors. I guess if you are making the Polaris connections
inside the main load center or inside an inverter you can eliminate the
cost of a dedicated enclosure. There would be some material and labor
savings.

​If the inverter has a maximum OCPD rating, you will be limited by that.
​Microinverters "get around" that by the wire and inverter being
sized/rated for the entire maximum string.

Jason Szumlanski

​Fafco Solar​



On Wed, Jun 25, 2014 at 10:40 PM, Isaac Opalinsky <
david.opalin...@sunpower.com> wrote:

>  Then how do we install microinverters?  705.12(D)(1) says OCPD for each
> inverter is required at the point of interconnection with distribution
> equipment.  But as long as the conductors are sized to the OCPD, we follow
> the branch-circuit/feeder tap rules, and the inverter’s maximum OCPD limit
> is not exceeded, what is the issue?  I’m assuming the inverter’s maximum
> OCPD is usually the limiting factor, but I’ve been intrigued by the fact
> that the ABB TRIO has an option for AC OCPD in the inverter – it seems like
> there must be a cost-effective solution for tapping a trunk cable with a
> string inverter just as we do with microinverters.  Has anyone tried this?
>
>
>
> *Isaac Opalinsky *| Technical Trainer | *SunPower Corporation*
>
> Desk 443-569-3476 | Cell 443-277-6286
>
>
>
> *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On
> Behalf Of *Glenn Burt
> *Sent:* Wednesday, June 25, 2014 10:19 PM
> *To:* RE-wrenches
> *Subject:* Re: [RE-wrenches] Combining Multiple Inverters
>
>
>
> Code requires OCPD on the output of each inverter, so not sure where the
> savings would be..
>   --
>
> *From: *Corey Shalanski 
> *Sent: *‎6/‎25/‎2014 21:19
> *To: *RE-wrenches@lists.re-wrenches.org
> *Subject: *[RE-wrenches] Combining Multiple Inverters
>
> I am curious about best practices for combining the output of multiple
> inverters:
>
>- We are considering using an insulated tap "Polaris/Burndy" connector
>in lieu of a solar accumulation panel. We would then run the output of this
>tap connector through a fused disconnect and on to the interconnection.
>Does anyone else do this?
>- In the above scenario, how should we size the wire between each
>inverter's output and the tap connector? Since there is no OCPD on this
>wire, would we have to use the same wire gauge as the combined output? or
>can we get away with sizing each wire according to its associated inverter
>output rating?
>
>  --
>
> Corey Shalanski
>
> Joule Energy
>
> New Orleans, LA
>
> ᐧ
>
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Re: [RE-wrenches] Combining Multiple Inverters

[Isaac Opalinsky]

Jason, I agree completely. I'm curious which inverters you plan to use and I'm 
interested to see the cost benefit. There is so much "stuff" in a PV 
installation, and not all of it contributes directly to safety and 
serviceability. Especially now that we are seeing rooftop 1000V string 
inverters, it would be good to see solutions that simplify installation, reduce 
points of maintenance, reduce cost and maintain or increase safety.


Isaac Opalinsky | Technical Trainer | More Energy. For Life.
Desk 443-277-6286 | Cell 443-277-6286


 Original message 
From: Jason Szumlanski
Date:06/26/2014 9:10 AM (GMT-05:00)
To: RE-wrenches
Subject: Re: [RE-wrenches] Combining Multiple Inverters

705.12(D) reads, "... the interconnection provisions for the 
utility-interactive inverter(s) shall comply with (D)(1) through (D)(7)." 
That's inverters - plural. The interconnection must be protected by dedicated 
OCPD, not each inverter individually. Microinverters comply because of this 
interpretation.

That said, I've never done it. An accumulator panel is pretty cost effective 
when you consider the alternative cost of an enclosure and the Polaris 
connectors. I guess if you are making the Polaris connections inside the main 
load center or inside an inverter you can eliminate the cost of a dedicated 
enclosure. There would be some material and labor savings.

​If the inverter has a maximum OCPD rating, you will be limited by that. 
​Microinverters "get around" that by the wire and inverter being sized/rated 
for the entire maximum string.


Jason Szumlanski

​Fafco Solar​


On Wed, Jun 25, 2014 at 10:40 PM, Isaac Opalinsky 
mailto:david.opalin...@sunpower.com>> wrote:
Then how do we install microinverters?  705.12(D)(1) says OCPD for each 
inverter is required at the point of interconnection with distribution 
equipment.  But as long as the conductors are sized to the OCPD, we follow the 
branch-circuit/feeder tap rules, and the inverter’s maximum OCPD limit is not 
exceeded, what is the issue?  I’m assuming the inverter’s maximum OCPD is 
usually the limiting factor, but I’ve been intrigued by the fact that the ABB 
TRIO has an option for AC OCPD in the inverter – it seems like there must be a 
cost-effective solution for tapping a trunk cable with a string inverter just 
as we do with microinverters.  Has anyone tried this?

Isaac Opalinsky | Technical Trainer | SunPower Corporation
Desk 443-569-3476 | Cell 443-277-6286

From: RE-wrenches 
[mailto:re-wrenches-boun...@lists.re-wrenches.org]
 On Behalf Of Glenn Burt
Sent: Wednesday, June 25, 2014 10:19 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Combining Multiple Inverters

Code requires OCPD on the output of each inverter, so not sure where the 
savings would be..

From: Corey Shalanski
Sent: ‎6/‎25/‎2014 21:19
To: RE-wrenches@lists.re-wrenches.org
Subject: [RE-wrenches] Combining Multiple Inverters
I am curious about best practices for combining the output of multiple 
inverters:

  *   We are considering using an insulated tap "Polaris/Burndy" connector in 
lieu of a solar accumulation panel. We would then run the output of this tap 
connector through a fused disconnect and on to the interconnection. Does anyone 
else do this?
  *   In the above scenario, how should we size the wire between each 
inverter's output and the tap connector? Since there is no OCPD on this wire, 
would we have to use the same wire gauge as the combined output? or can we get 
away with sizing each wire according to its associated inverter output rating?
--
Corey Shalanski
Joule Energy
New Orleans, LA
[http://portal.mxlogic.com/images/transparent.gif]ᐧ

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Re: [RE-wrenches] Rapid shutdown for pole mounts

[Dave Click]

NEC says 10' from the array, defined as "A mechanically integrated 
assembly of modules or panels with a support structure and foundation, 
tracker, and other components, as required, to form a direct-current 
power-producing unit. 70HB14_CH00_FM_pi_xii.pdf " I take this to mean 
that the "array" definition includes support structure, so you could go 
10' from the bottom of the pole?


But that doesn't matter, as rapid shutdown requirements only apply to PV 
systems "on or in" buildings; it only applies to a ground-mounted system 
if you bring the dc all the way into a building (for at least a 5' run 
within the structure). So, Rapid Shutdown doesn't apply at all to your 
scenario where only the ac wiring from a pole mount enters the building.


DKC


On 2014/6/25, 12:00, Jesse Dahl wrote:

Re-reading this rapid shutdown convo.

 Does 10' from the array mean from the modules or the "mount"? What if 
the array is on a pole, the pole is 15' tall and the inverter is 
mounted at the base of the pole?  Since the array (modules) is 15' 
from the inverter is rapid shutdown required?


Again, since the title of 690.12 is "On Buildings" is it required for 
pole mounts where only AC enters the building?  Thoughts?


Thanks!


Jesse


On Sat, Apr 19, 2014 at 12:22 PM, Dan Fink > wrote:


Hi Aaron, boB, Wrenches;

I think Aaron brings up a good point, and it's certainly confusing
to me.

The boldface type heading of 690.12 is "Rapid Shutdown of PV
Systems on Buildings"

The body of the 690.12 text begins with "PV system *circuits*
installed on or in buildings shall."

690.2 defines "Photovoltaic source circuit" as "Circuits between
modules and from modules to the common connection point(s) of the
DC system"

and "Photovoltaic output circuit" as "Circuit conductors between
the PV source circuit(s) and the inverter or DC utilization
equipment."

"PV system" from the heading of 690.12 is not defined in 690.2,
other than that the definition of "Photovoltaic system voltage"
 specifically includes both PV output and source circuits.

To me the confusing part of 690.12 is "PV Systems on Buildings" is
that "system" is not defined, and tends to imply rooftop arrays.
But "PV system circuits installed on or in buildings shall."
is pretty clear. I interpret it to mean anything DC and PV stuck
to the side of building like conduit, etc, or running
insidewhich means it applies to ground-mount arrays too if
they terminate outside or inside the building.

What I'm seeing as the easy work-around for us off-grid folk is
the old "power shed" idea containing battery bank, balance of
system, inverter etcjust build it within 10 feet of the PV
array and you're fine.

Any thoughts?


Dan Fink,
Executive Director;
Otherpower
Buckville Energy Consulting
Buckville Publications LLC
NABCEP / IREC accredited Continuing Education Providers
970.672.4342 



On Fri, Apr 18, 2014 at 3:30 PM, b...@midnitesolar.com
 mailto:b...@midnitesolar.com>> wrote:


Bill Brooks should probably respond to this also, but reading
the NEC, it looks like if the wires
do not go inside the building to run more than 5 feet (as the
crow flies), the the rapid disconnect
does not apply.OR, less than 10 feet from the array IF the
PV is mounted on that building.

boB




On 4/18/2014 1:34 PM, Aaron Mandelkorn wrote:

The rapid shutdown language is so confusing. When looking
at the rapid shutdown language, does PV systems "on" a
building refer to only situations where the array is on a
building; or does it include DC conductors as well. For
example, if the DC conductors from a pole mounted array
run up the side of a building before punching in to the
inverter, does this require rapid shutdown?  Is this PV
system considered "on" a building?

Aaron

Aaron Mandelkorn
Owner/Solar Specialist
Renewable Energy Outfitters
719-221-5249 
970-596-3744 
www.reosolar.com 
reoso...@gmail.com 



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Re: [RE-wrenches] Racking System - Identification Help

[Dave Click]

As an update- the system used at this install turned out to be a 
currently-available product called SolAttach:

http://www.solattach.com/


On 2014/6/3, 11:11, Dave Click wrote:
Jason, thanks for the comment! I agree that systems could connect to 
just sheathing and stay on the roof- I think Zilla has a product that 
does this too. My concern about wind resistance stems from the fact 
that there appeared to be an engineer's stamp on the Unirac calcs with 
lag screws and then something completely different was installed in 
the field. It's likely that this installer has used this same mounting 
system in windier coastal areas so hopefully their fastener selection 
had some informed analysis... I didn't see any, though.


And to be clear, I'm not looking to overrule another PE if it is in 
fact an engineered system and it's just that the wrong set of plans 
got submitted to the building department.


DKC



On 2014/6/3, 10:12, Jason Szumlanski wrote:

Dave,

I can't identify your hardware, but I just wanted to comment on your 
comment about hitting rafters. There are products out there that can 
obtain the requisite load ratings without connecting directly to 
structural members. We have had systems engineered and permitted 
using Ecofasten products on low-slope roofs that fasten only to wood 
sheathing or metal roof materials in 170 mph zones in Florida (ASCE 
7-10, FBC 2010). I'm not an engineer, but I've been told if there is 
adequate data on pull-out and shear, you can use that data to 
properly design a system without hitting rafters with the right 
number of attachment points. I don't like the looks of what you 
pictured, but it's plausible that it was an engineered system design. 
The permit drawings not matching... that is another story...


If, for example, each of the six fasteners provide 100 pounds of 
pullout strength with a safety factor, that would be good for 12 sq 
ft at 50 spf uplift per attachment. 250 fasteners would be good for 
about 5kW of solar.


Jason Szumlanski

Fafco Solar


On Tue, Jun 3, 2014 at 9:06 AM, Dave Click > wrote:


Hi all,

Anyone know what this racking system is? The permit drawings say
Unirac with lag screws and Eco-Fasten flashings, which this
pretty clearly isn't. I'd never seen this before, and I imagine
this wind resistance is not quite the 140 mph that the installer
claims it is. Of the ~250 wood screws holding this system down
into the roof, I think six of them accidentally hit rafters.

Thanks!
Dave



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[RE-wrenches] Pv wire

[Kirk]

Hi folks,
What is the proper approximate in2  area to use for #10 1kva/2kva  pv wire for 
calculating conduit fill? I'm on a job site and don't have the specs with me. 
Thanks.

Kirk Herander
VSE
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Re: [RE-wrenches] Pv wire

[dan]

I got .0437" for RHH-2 with outer jacket in the 2011 code

 Original Message 
Subject: [RE-wrenches] Pv wire
From: "Kirk" 
Date: Thu, June 26, 2014 1:15 pm
To: "RE-wrenches" 

Hi folks,
What is the proper approximate in2  area to use for #10 1kva/2kva  pv wire for 
calculating conduit fill? I'm on a job site and don't have the specs with me. 
Thanks.

Kirk Herander
VSE
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Re: [RE-wrenches] Pv wire

[Daniel Young]

Correction, my wire is 0.259" OD, still 0.053 in^2

Daniel Young, 
NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90
NABCEP Certified Solar Heating InstallerTM: Cert #SH031409-13
 
Lead Systems Designer for:

www.dovetailsolar.com
Ph: 740-274-0139

We’ve completed over 310 renewable energy projects!  Check out a few in our
photo gallery: 
http://www.dovetailsolar.com/Our-Work.aspx?path=commercial+-+solar+electric
This email message and attachments are intended only for the addressee.  It
may contain information which is legally privileged, confidential and exempt
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may not disclose, print, copy or disseminate this message and/or the
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privacy matters. 


-Original Message-
From: Daniel Young [mailto:dyo...@dovetailsolar.com] 
Sent: Thursday, June 26, 2014 1:53 PM
To: 'RE-wrenches'
Subject: RE: [RE-wrenches] Pv wire

My 2kV PV wire is 0.29"OD, so I use 0.053in^2. It's single layer insulation
if that helps.

Daniel Young,
NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90 NABCEP
Certified Solar Heating InstallerTM: Cert #SH031409-13
 
Lead Systems Designer for:

www.dovetailsolar.com
Ph: 740-274-0139

We’ve completed over 310 renewable energy projects!  Check out a few in our
photo gallery: 
http://www.dovetailsolar.com/Our-Work.aspx?path=commercial+-+solar+electric
This email message and attachments are intended only for the addressee.  It
may contain information which is legally privileged, confidential and exempt
from disclosure.  If you are not the intended recipient of this message, you
may not disclose, print, copy or disseminate this message and/or the
information contained in the message.  If you have received this message in
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along with any attachments.  Unauthorized interception of this email is a
violation of criminal laws and laws covering electronic communications
privacy matters. 

-Original Message-
From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On
Behalf Of d...@foxfire-energy.com
Sent: Thursday, June 26, 2014 1:44 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Pv wire


I got .0437" for RHH-2 with outer jacket in the 2011 code

 Original Message 
Subject: [RE-wrenches] Pv wire
From: "Kirk" 
Date: Thu, June 26, 2014 1:15 pm
To: "RE-wrenches" 

Hi folks,
What is the proper approximate in2  area to use for #10 1kva/2kva  pv wire
for calculating conduit fill? I'm on a job site and don't have the specs
with me. Thanks.

Kirk Herander
VSE
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Re: [RE-wrenches] Pv wire

[Jason Szumlanski]

I use this site when I need a quick answer. Use RHH (covered) with one
conductor. You get the same answer.

http://www.electrician2.com/calculators/rf_calculator.html


Jason Szumlanski

​Fafco Solar​


On Thu, Jun 26, 2014 at 1:46 PM, Jason Szumlanski 
wrote:

> 0.0437435 per this attached spec sheet for 600V.
>
>
>  Jason Szumlanski
>
>
> On Thu, Jun 26, 2014 at 1:15 PM, Kirk  wrote:
>
>> Hi folks,
>> What is the proper approximate in2  area to use for #10 1kva/2kva  pv
>> wire for calculating conduit fill? I'm on a job site and don't have the
>> specs with me. Thanks.
>>
>> Kirk Herander
>> VSE
>>
>>
>
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Re: [RE-wrenches] Pv wire

[Kirk]

Dan,
Pv wire is xlpe.

Kirk Herander
VSE

> On Jun 26, 2014, at 1:44 PM, d...@foxfire-energy.com wrote:
> 
> 
> I got .0437" for RHH-2 with outer jacket in the 2011 code
> 
>  Original Message 
> Subject: [RE-wrenches] Pv wire
> From: "Kirk" 
> Date: Thu, June 26, 2014 1:15 pm
> To: "RE-wrenches" 
> 
> Hi folks,
> What is the proper approximate in2  area to use for #10 1kva/2kva  pv wire 
> for calculating conduit fill? I'm on a job site and don't have the specs with 
> me. Thanks.
> 
> Kirk Herander
> VSE
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Re: [RE-wrenches] Pv wire

[Daniel Young]

My 2kV PV wire is 0.29"OD, so I use 0.053in^2. It's single layer insulation
if that helps.

Daniel Young, 
NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90
NABCEP Certified Solar Heating InstallerTM: Cert #SH031409-13
 
Lead Systems Designer for:

www.dovetailsolar.com
Ph: 740-274-0139

We’ve completed over 310 renewable energy projects!  Check out a few in our
photo gallery: 
http://www.dovetailsolar.com/Our-Work.aspx?path=commercial+-+solar+electric
This email message and attachments are intended only for the addressee.  It
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may not disclose, print, copy or disseminate this message and/or the
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violation of criminal laws and laws covering electronic communications
privacy matters. 

-Original Message-
From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On
Behalf Of d...@foxfire-energy.com
Sent: Thursday, June 26, 2014 1:44 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Pv wire


I got .0437" for RHH-2 with outer jacket in the 2011 code

 Original Message 
Subject: [RE-wrenches] Pv wire
From: "Kirk" 
Date: Thu, June 26, 2014 1:15 pm
To: "RE-wrenches" 

Hi folks,
What is the proper approximate in2  area to use for #10 1kva/2kva  pv wire
for calculating conduit fill? I'm on a job site and don't have the specs
with me. Thanks.

Kirk Herander
VSE
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-
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.2247 / Virus Database: 3955/7239 - Release Date: 06/25/14

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Re: [RE-wrenches] Pv wire

[Kirk]

Nice calculator. RHH may be equivalent to 600 volt pv wire, but 1k/2k pv wire 
is thicker. 

Kirk Herander
VSE

> On Jun 26, 2014, at 1:49 PM, Jason Szumlanski  wrote:
> 
> I use this site when I need a quick answer. Use RHH (covered) with one 
> conductor. You get the same answer.
> 
> http://www.electrician2.com/calculators/rf_calculator.html
> 
> 
> Jason Szumlanski
> ​Fafco Solar​
> 
>> On Thu, Jun 26, 2014 at 1:46 PM, Jason Szumlanski  
>> wrote:
>> 0.0437435 per this attached spec sheet for 600V.
>> 
>> 
>> Jason Szumlanski
>> 
>> 
>> 
>>> On Thu, Jun 26, 2014 at 1:15 PM, Kirk  wrote:
>>> Hi folks,
>>> What is the proper approximate in2  area to use for #10 1kva/2kva  pv wire 
>>> for calculating conduit fill? I'm on a job site and don't have the specs 
>>> with me. Thanks.
>>> 
>>> Kirk Herander
>>> VSE
> 
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Re: [RE-wrenches] Pv wire

[Jason Szumlanski]

Yeah, 1k/2k wire shows a diameter of 0.26" on the spec sheet, or 0.053093
in^2.

Jason Szumlanski

​Fafco Solar​




On Thu, Jun 26, 2014 at 2:06 PM, Kirk  wrote:

> Nice calculator. RHH may be equivalent to 600 volt pv wire, but 1k/2k pv
> wire is thicker.
>
> Kirk Herander
> VSE
>
> On Jun 26, 2014, at 1:49 PM, Jason Szumlanski 
> wrote:
>
> I use this site when I need a quick answer. Use RHH (covered) with one
> conductor. You get the same answer.
>
> http://www.electrician2.com/calculators/rf_calculator.html
>
>
> Jason Szumlanski
>
> ​Fafco Solar​
>
>
> On Thu, Jun 26, 2014 at 1:46 PM, Jason Szumlanski 
> wrote:
>
>> 0.0437435 per this attached spec sheet for 600V.
>>
>>
>>  Jason Szumlanski
>>
>>
>> On Thu, Jun 26, 2014 at 1:15 PM, Kirk  wrote:
>>
>>> Hi folks,
>>> What is the proper approximate in2  area to use for #10 1kva/2kva  pv
>>> wire for calculating conduit fill? I'm on a job site and don't have the
>>> specs with me. Thanks.
>>>
>>> Kirk Herander
>>> VSE
>>>
>>>
>>
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>
>
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Re: [RE-wrenches] Pv wire

[Kirk]

Thanks. I remember it being about .05 or so.

Kirk Herander
VSE

> On Jun 26, 2014, at 1:53 PM, "Daniel Young"  wrote:
> 
> My 2kV PV wire is 0.29"OD, so I use 0.053in^2. It's single layer insulation
> if that helps.
> 
> Daniel Young, 
> NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90
> NABCEP Certified Solar Heating InstallerTM: Cert #SH031409-13
> 
> Lead Systems Designer for:
> 
> www.dovetailsolar.com
> Ph: 740-274-0139
> 
> We’ve completed over 310 renewable energy projects!  Check out a few in our
> photo gallery: 
> http://www.dovetailsolar.com/Our-Work.aspx?path=commercial+-+solar+electric
> This email message and attachments are intended only for the addressee.  It
> may contain information which is legally privileged, confidential and exempt
> from disclosure.  If you are not the intended recipient of this message, you
> may not disclose, print, copy or disseminate this message and/or the
> information contained in the message.  If you have received this message in
> error, please reply and notify the sender (only) and delete this message
> along with any attachments.  Unauthorized interception of this email is a
> violation of criminal laws and laws covering electronic communications
> privacy matters. 
> 
> -Original Message-
> From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On
> Behalf Of d...@foxfire-energy.com
> Sent: Thursday, June 26, 2014 1:44 PM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] Pv wire
> 
> 
> I got .0437" for RHH-2 with outer jacket in the 2011 code
> 
>  Original Message 
> Subject: [RE-wrenches] Pv wire
> From: "Kirk" 
> Date: Thu, June 26, 2014 1:15 pm
> To: "RE-wrenches" 
> 
> Hi folks,
> What is the proper approximate in2  area to use for #10 1kva/2kva  pv wire
> for calculating conduit fill? I'm on a job site and don't have the specs
> with me. Thanks.
> 
> Kirk Herander
> VSE
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Re: [RE-wrenches] Split bolts

[Drake]

When using split bolts, roll up splicing tape and 
push it between the forks of the bolt. This fills 
in the gap and is very helpful in eliminating the sharp edges.


Our utility won't allow piercing connectors on a line side tap.


At 02:14 PM 6/25/2014, you wrote:

Content-Type: multipart/related;
boundary="=_NextPart_000_01E8_01CF9066.A8D7C290"
Content-Language: en-us

Friends:

I narrowly avoided catastrophe yesterday.  I 
created a tap connection on a 200 amp main 
breaker.  I wrap split bolts with Scotch 2229 
mastic and then cover that with a generous layer of Scotch 33+ tape.


On this occasion, just as I was putting the dead 
front in place I noticed the glint of metal 
poking through the mastic and tape.  The points 
on the legs of the split bolt are sharp and the 
mastic and tape had crept away from this point 
and exposed a tiny point of metal.  This point 
would have contacted the dead front lightly or 
at least would have been in close 
proximity.  Had I energized the breaker, I would 
have had a significant arc.  I unwrapped both 
connectors so both bolts had the legs facing 
away from the dead-front, creating a good ½” of 
clearance and then wrapped them more carefully.


30 years ago I had access to rubberized cloth 
tape that we used instead of the mastic.  I 
suspect the cloth tape is more durable than the 
mastic, but I don’t see it in the supply houses anymore.


How do the rest of you wrap split bolts so you 
are confident that the mastic won’t creep away 
from a high point on the connector?


Thanks in advance.

William

Gradient Cap_mini

Lic 773985
millersolar.com
805-438-5600



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Re: [RE-wrenches] Split bolts

[William Miller]

Brilliant!  Thanks. 

Miller Solar

> On Jun 26, 2014, at 11:47 AM, Drake  
> wrote:
> 
> When using split bolts, roll up splicing tape and push it between the forks 
> of the bolt. This fills in the gap and is very helpful in eliminating the 
> sharp edges. 
> 
> Our utility won't allow piercing connectors on a line side tap. 
> 
> 
> At 02:14 PM 6/25/2014, you wrote:
>> Content-Type: multipart/related;
>>  boundary="=_NextPart_000_01E8_01CF9066.A8D7C290"
>> Content-Language: en-us
>> 
>> Friends:
>>  
>> I narrowly avoided catastrophe yesterday.  I created a tap connection on a 
>> 200 amp main breaker.  I wrap split bolts with Scotch 2229 mastic and then 
>> cover that with a generous layer of Scotch 33+ tape.  
>>  
>> On this occasion, just as I was putting the dead front in place I noticed 
>> the glint of metal poking through the mastic and tape.  The points on the 
>> legs of the split bolt are sharp and the mastic and tape had crept away from 
>> this point and exposed a tiny point of metal.  This point would have 
>> contacted the dead front lightly or at least would have been in close 
>> proximity.  Had I energized the breaker, I would have had a significant arc. 
>>  I unwrapped both connectors so both bolts had the legs facing away from the 
>> dead-front, creating a good ½” of clearance and then wrapped them more 
>> carefully.
>>  
>> 30 years ago I had access to rubberized cloth tape that we used instead of 
>> the mastic.  I suspect the cloth tape is more durable than the mastic, but I 
>> don’t see it in the supply houses anymore.
>>  
>> How do the rest of you wrap split bolts so you are confident that the mastic 
>> won’t creep away from a high point on the connector?
>>  
>> Thanks in advance.
>>  
>> William
>>  
>> <1224040.jpg> 
>> Lic 773985
>> millersolar.com
>> 805-438-5600
>>  
>> 
>> 
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Re: [RE-wrenches] Split bolts

[AllSolar]

How about these?



http://www.idealindustries.com/prodDetail.do?prodId=30-222&div=0&l1=lugs

I’ve been using them for a while now.

Jeremy

All Solar Inc 
Jeremy & Amy Rodriguez 
1463 M. Street
Penrose, CO 81240
719-372-3808
1-800-499-4055
allso...@scswifi.net
allso...@live.com
www.asolarelectric.com

From: William Miller 
Sent: Thursday, June 26, 2014 1:08 PM
To: RE-wrenches 
Subject: Re: [RE-wrenches] Split bolts

Brilliant!  Thanks. 

Miller Solar

On Jun 26, 2014, at 11:47 AM, Drake  
wrote:


  When using split bolts, roll up splicing tape and push it between the forks 
of the bolt. This fills in the gap and is very helpful in eliminating the sharp 
edges. 

  Our utility won't allow piercing connectors on a line side tap. 


  At 02:14 PM 6/25/2014, you wrote:

Content-Type: multipart/related;
boundary="=_NextPart_000_01E8_01CF9066.A8D7C290"
Content-Language: en-us

Friends:
 
I narrowly avoided catastrophe yesterday.  I created a tap connection on a 
200 amp main breaker.  I wrap split bolts with Scotch 2229 mastic and then 
cover that with a generous layer of Scotch 33+ tape.  
 
On this occasion, just as I was putting the dead front in place I noticed 
the glint of metal poking through the mastic and tape.  The points on the legs 
of the split bolt are sharp and the mastic and tape had crept away from this 
point and exposed a tiny point of metal.  This point would have contacted the 
dead front lightly or at least would have been in close proximity.  Had I 
energized the breaker, I would have had a significant arc.  I unwrapped both 
connectors so both bolts had the legs facing away from the dead-front, creating 
a good ½” of clearance and then wrapped them more carefully.
 
30 years ago I had access to rubberized cloth tape that we used instead of 
the mastic.  I suspect the cloth tape is more durable than the mastic, but I 
don’t see it in the supply houses anymore.
 
How do the rest of you wrap split bolts so you are confident that the 
mastic won’t creep away from a high point on the connector?
 
Thanks in advance.
 
William
 
<1224040.jpg> 
Lic 773985
millersolar.com
805-438-5600
 


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[RE-wrenches] No toxic sealant

[Drake]

Hello Wrenches,

We are planning to install on a metal roof that rain water will be 
collected from. Usually we use butyl tape and a butyl base caulk to 
seal around the L-Feet. Is there a good method that would not require 
using toxic material to seal the feet on a metal roof.


Thank you,

Drake

Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328
http://athens-electric.com/


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Re: [RE-wrenches] Split bolts

[William Miller]

Rated only for 300 volts. 

Miller Solar

> On Jun 26, 2014, at 1:04 PM,  wrote:
> 
> How about these?
>  
> <30-222[3].jpg>
>  
> http://www.idealindustries.com/prodDetail.do?prodId=30-222&div=0&l1=lugs
>  
> I’ve been using them for a while now.
>  
> Jeremy
>  
> All Solar Inc 
> Jeremy & Amy Rodriguez 
> 1463 M. Street
> Penrose, CO 81240
> 719-372-3808
> 1-800-499-4055
> allso...@scswifi.net
> allso...@live.com
> www.asolarelectric.com
>  
> From: William Miller
> Sent: Thursday, June 26, 2014 1:08 PM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] Split bolts
>  
> Brilliant!  Thanks. 
> 
> Miller Solar
> 
>> On Jun 26, 2014, at 11:47 AM, Drake  
>> wrote:
>> 
>> When using split bolts, roll up splicing tape and push it between the forks 
>> of the bolt. This fills in the gap and is very helpful in eliminating the 
>> sharp edges. 
>> 
>> Our utility won't allow piercing connectors on a line side tap. 
>> 
>> 
>> At 02:14 PM 6/25/2014, you wrote:
>>> Content-Type: multipart/related;
>>> boundary="=_NextPart_000_01E8_01CF9066.A8D7C290"
>>> Content-Language: en-us
>>> 
>>> Friends:
>>>  
>>> I narrowly avoided catastrophe yesterday.  I created a tap connection on a 
>>> 200 amp main breaker.  I wrap split bolts with Scotch 2229 mastic and then 
>>> cover that with a generous layer of Scotch 33+ tape.  
>>>  
>>> On this occasion, just as I was putting the dead front in place I noticed 
>>> the glint of metal poking through the mastic and tape.  The points on the 
>>> legs of the split bolt are sharp and the mastic and tape had crept away 
>>> from this point and exposed a tiny point of metal.  This point would have 
>>> contacted the dead front lightly or at least would have been in close 
>>> proximity.  Had I energized the breaker, I would have had a significant 
>>> arc.  I unwrapped both connectors so both bolts had the legs facing away 
>>> from the dead-front, creating a good ½” of clearance and then wrapped them 
>>> more carefully.
>>>  
>>> 30 years ago I had access to rubberized cloth tape that we used instead of 
>>> the mastic.  I suspect the cloth tape is more durable than the mastic, but 
>>> I don’t see it in the supply houses anymore.
>>>  
>>> How do the rest of you wrap split bolts so you are confident that the 
>>> mastic won’t creep away from a high point on the connector?
>>>  
>>> Thanks in advance.
>>>  
>>> William
>>>  
>>> <1224040.jpg> 
>>> Lic 773985
>>> millersolar.com
>>> 805-438-5600
>>>  
>>> 
>>> 
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Re: [RE-wrenches] RE-wrenches Digest, Vol 7, Issue 245

[Corey Shalanski]

We considered the necessity to shut down individual inverters and
determined that the added costs of an inverter output combiner panel were
not merited. I agree that in theory it seems beneficial to be able to
switch each inverter individually, but how often does this occur in
practice? For the relatively infrequent cases where we need to return to a
jobsite and shut down an inverter - for troubleshooting/removal/etc. - we
do not mind shutting down the other inverters (up to a limit) for what is
hopefully a short period of time.

Again, this whole line of reasoning may be shown to be faulty if someone
can directly point to the Code section that requires OCPD on each
individual inverter.

--
Corey
ᐧ


On Thu, Jun 26, 2014 at 9:20 AM, 
wrote:

>
> Message: 5
> Date: Wed, 25 Jun 2014 19:17:57 -0700
> From: William Miller 
> To: RE-wrenches 
> Subject: Re: [RE-wrenches] Combining Multiple Inverters
> Message-ID: <04f4b8fd-e280-4bf2-b5a4-c2fca8d1c...@millersolar.com>
> Content-Type: text/plain; charset="utf-8"
>
> Not allowed. You need a dedicated OCPD. Plus seems like a really bad idea.
>  How do you shut down just one inverter?
>
>
>
> Miller Solar
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Re: [RE-wrenches] Split bolts

[Jeff Clearwater]

We've found that Scotch 88 tape is much less prone to heat sag and thicker so 
much more appropriate in containing the mastic. 

Sent from my iPhone

On Jun 26, 2014, at 1:44 PM, William Miller  wrote:

> Rated only for 300 volts. 
> 
> Miller Solar
> 
> On Jun 26, 2014, at 1:04 PM,  wrote:
> 
>> How about these?
>>  
>> <30-222[3].jpg>
>>  
>> http://www.idealindustries.com/prodDetail.do?prodId=30-222&div=0&l1=lugs
>>  
>> I’ve been using them for a while now.
>>  
>> Jeremy
>>  
>> All Solar Inc 
>> Jeremy & Amy Rodriguez 
>> 1463 M. Street
>> Penrose, CO 81240
>> 719-372-3808
>> 1-800-499-4055
>> allso...@scswifi.net
>> allso...@live.com
>> www.asolarelectric.com
>>  
>> From: William Miller
>> Sent: Thursday, June 26, 2014 1:08 PM
>> To: RE-wrenches
>> Subject: Re: [RE-wrenches] Split bolts
>>  
>> Brilliant!  Thanks. 
>> 
>> Miller Solar
>> 
>> On Jun 26, 2014, at 11:47 AM, Drake  
>> wrote:
>> 
>>> When using split bolts, roll up splicing tape and push it between the forks 
>>> of the bolt. This fills in the gap and is very helpful in eliminating the 
>>> sharp edges. 
>>> 
>>> Our utility won't allow piercing connectors on a line side tap. 
>>> 
>>> 
>>> At 02:14 PM 6/25/2014, you wrote:
 Content-Type: multipart/related;
 boundary="=_NextPart_000_01E8_01CF9066.A8D7C290"
 Content-Language: en-us
 
 Friends:
  
 I narrowly avoided catastrophe yesterday.  I created a tap connection on a 
 200 amp main breaker.  I wrap split bolts with Scotch 2229 mastic and then 
 cover that with a generous layer of Scotch 33+ tape.  
  
 On this occasion, just as I was putting the dead front in place I noticed 
 the glint of metal poking through the mastic and tape.  The points on the 
 legs of the split bolt are sharp and the mastic and tape had crept away 
 from this point and exposed a tiny point of metal.  This point would have 
 contacted the dead front lightly or at least would have been in close 
 proximity.  Had I energized the breaker, I would have had a significant 
 arc.  I unwrapped both connectors so both bolts had the legs facing away 
 from the dead-front, creating a good ½” of clearance and then wrapped them 
 more carefully.
  
 30 years ago I had access to rubberized cloth tape that we used instead of 
 the mastic.  I suspect the cloth tape is more durable than the mastic, but 
 I don’t see it in the supply houses anymore.
  
 How do the rest of you wrap split bolts so you are confident that the 
 mastic won’t creep away from a high point on the connector?
  
 Thanks in advance.
  
 William
  
 <1224040.jpg> 
 Lic 773985
 millersolar.com
 805-438-5600
  
 
 
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Re: [RE-wrenches] No toxic sealant

[Solar]

What fastener are you using? Could you just use an EJOT type lag and skip 
sealant? 

Jesse

Sent from my iPhone

> On Jun 26, 2014, at 3:07 PM, Drake  
> wrote:
> 
> Hello Wrenches,
> 
> We are planning to install on a metal roof that rain water will be collected 
> from. Usually we use butyl tape and a butyl base caulk to seal around the 
> L-Feet. Is there a good method that would not require using toxic material to 
> seal the feet on a metal roof. 
> 
> Thank you,
> 
> Drake 
> 
> Drake Chamberlin
> Athens Electric LLC
> OH License 44810
> CO License 3773
> NABCEP Certified Solar PV 
> 740-448-7328
> http://athens-electric.com/
> 
> 
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Re: [RE-wrenches] Combining Multiple Inverters

[Dave Click]

Corey,

The line of reasoning is faulty. It's 705.12(D)(1). Micro-inverters are 
the exception because they are specially listed to share a breaker. As 
for the other inverters, doubling them up on a single breaker / 
disconnect probably goes against their installation instructions 
[110.3(B)] and it's unlikely that you could put multiple units on a 
single breaker anyway because when you take (2 inverters) x (rated 
current) x (1.25) you will probably come up with a minimum breaker size 
that is larger than the maximum allowed under the NRTL listing to UL 1741.


Dave



On 2014/6/26, 16:18, Corey Shalanski wrote:
We considered the necessity to shut down individual inverters and 
determined that the added costs of an inverter output combiner panel 
were not merited. I agree that in theory it seems beneficial to be 
able to switch each inverter individually, but how often does this 
occur in practice? For the relatively infrequent cases where we need 
to return to a jobsite and shut down an inverter - for 
troubleshooting/removal/etc. - we do not mind shutting down the other 
inverters (up to a limit) for what is hopefully a short period of time.


Again, this whole line of reasoning may be shown to be faulty if 
someone can directly point to the Code section that requires OCPD on 
each individual inverter.


--
Corey
?


On Thu, Jun 26, 2014 at 9:20 AM, 
> wrote:



Message: 5
Date: Wed, 25 Jun 2014 19:17:57 -0700
From: William Miller mailto:will...@millersolar.com>>
To: RE-wrenches mailto:re-wrenches@lists.re-wrenches.org>>
Subject: Re: [RE-wrenches] Combining Multiple Inverters
Message-ID: <04f4b8fd-e280-4bf2-b5a4-c2fca8d1c...@millersolar.com
>
Content-Type: text/plain; charset="utf-8"

Not allowed. You need a dedicated OCPD. Plus seems like a really
bad idea.  How do you shut down just one inverter?



Miller Solar



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Re: [RE-wrenches] No toxic sealant

[Ray Walters]

Butyl tape is what we used for decades on rain catch systems.Check 
with the Earth ship folks at Greater World, they're all over the details 
on rain catch systems.

http://earthship.com/community

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 6/26/2014 2:07 PM, Drake wrote:

Hello Wrenches,

We are planning to install on a metal roof that rain water will be 
collected from. Usually we use butyl tape and a butyl base caulk to 
seal around the L-Feet. Is there a good method that would not require 
using toxic material to seal the feet on a metal roof.


Thank you,

Drake

Drake Chamberlin
/Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328
/http://athens-electric.com/




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Re: [RE-wrenches] Combining Multiple Inverters

[Corey Shalanski]

ᐧ
Perhaps I should've been more specific with my scenario. I was imagining a
supply side connection, as this would more commonly be the case when
combining multiple inverters. In this case it seems like the provisions of
705.12(D) for load side conections don't even apply, no? Rather 705.12(A)
becomes the relevant section, and I see very few restrictions there.

Even with a load side connection I would tend to agree with Jason's
interpretation: Does the "source interconnection" in 705.12(D)(1) refer to
each individual inverter, or can it refer to an aggregated "source"?

I am interested in pursuing this idea, mainly to understand how/where the
NEC forbids it. In lieu of a clear Code reference against it, how is this
any different from a branch circuit (in reverse)? ie, as with
microinverters.

--
Corey Shalanski
Joule Energy
New Orleans, LA

On Thu, Jun 26, 2014 at 9:20 AM, 
 wrote:

>
> Message: 11
> Date: Thu, 26 Jun 2014 09:10:07 -0400
> From: Jason Szumlanski 
> To: RE-wrenches 
> Subject: Re: [RE-wrenches] Combining Multiple Inverters
> Message-ID:
> <
> cajjtg3oqgblzatinuhfp_ghivzyd6dldslankc1ofg9tr1r...@mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> 705.12(D) reads, "... the interconnection provisions for the
> utility-interactive inverter(s) shall comply with (D)(1) through (D)(7)."
> That's inverters - plural. The interconnection must be protected by
> dedicated OCPD, not each inverter individually. Microinverters comply
> because of this interpretation.
>
> That said, I've never done it. An accumulator panel is pretty cost
> effective when you consider the alternative cost of an enclosure and the
> Polaris connectors. I guess if you are making the Polaris connections
> inside the main load center or inside an inverter you can eliminate the
> cost of a dedicated enclosure. There would be some material and labor
> savings.
>
> ?If the inverter has a maximum OCPD rating, you will be limited by that.
> ?Microinverters "get around" that by the wire and inverter being
> sized/rated for the entire maximum string.
>
> Jason Szumlanski
>
> ?Fafco Solar?
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Re: [RE-wrenches] Combining Multiple Inverters

[Corey Shalanski]

ᐧ
We considered the necessity to shut down individual inverters and
determined that the added costs of an inverter output combiner panel were
not merited. I agree that in theory it seems beneficial to be able to
switch each inverter individually, but how often does this occur in
practice? For the relatively infrequent cases where we need to return to a
jobsite and shut down an inverter - for troubleshooting/removal/etc. - we
do not mind shutting down the other inverters (up to a limit) for what is
hopefully a short period of time.

Again, this whole line of reasoning may be shown to be faulty if someone
can directly point to the Code section that requires OCPD on each
individual inverter.

--
Corey


On Thu, Jun 26, 2014 at 9:20 AM, 
 wrote:

>
> Message: 5
> Date: Wed, 25 Jun 2014 19:17:57 -0700
> From: William Miller 
> To: RE-wrenches 
> Subject: Re: [RE-wrenches] Combining Multiple Inverters
> Message-ID: <04f4b8fd-e280-4bf2-b5a4-c2fca8d1c...@millersolar.com>
> Content-Type: text/plain; charset="utf-8"
>
> Not allowed. You need a dedicated OCPD. Plus seems like a really bad idea.
>  How do you shut down just one inverter?
>
>
>
> Miller Solar
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Re: [RE-wrenches] Combining Multiple Inverters

[Jay Peltz]

I have never seen an inverter that does not specify a OCPD size. 

Jay
Peltz power. 

Sent from my iPhone

> On Jun 26, 2014, at 3:20 PM, Dave Click  wrote:
> 
> Corey,
> 
> The line of reasoning is faulty. It's 705.12(D)(1). Micro-inverters are the 
> exception because they are specially listed to share a breaker. As for the 
> other inverters, doubling them up on a single breaker / disconnect probably 
> goes against their installation instructions [110.3(B)] and it's unlikely 
> that you could put multiple units on a single breaker anyway because when you 
> take (2 inverters) x (rated current) x (1.25) you will probably come up with 
> a minimum breaker size that is larger than the maximum allowed under the NRTL 
> listing to UL 1741.
> 
> Dave
> 
> 
> 
>> On 2014/6/26, 16:18, Corey Shalanski wrote:
>> We considered the necessity to shut down individual inverters and determined 
>> that the added costs of an inverter output combiner panel were not merited. 
>> I agree that in theory it seems beneficial to be able to switch each 
>> inverter individually, but how often does this occur in practice? For the 
>> relatively infrequent cases where we need to return to a jobsite and shut 
>> down an inverter - for troubleshooting/removal/etc. - we do not mind 
>> shutting down the other inverters (up to a limit) for what is hopefully a 
>> short period of time.
>> 
>> Again, this whole line of reasoning may be shown to be faulty if someone can 
>> directly point to the Code section that requires OCPD on each individual 
>> inverter.
>> 
>> --
>> Corey
>> ᐧ
>> 
>> 
>>> On Thu, Jun 26, 2014 at 9:20 AM, 
>>>  wrote:
>>> 
>>> Message: 5
>>> Date: Wed, 25 Jun 2014 19:17:57 -0700
>>> From: William Miller 
>>> To: RE-wrenches 
>>> Subject: Re: [RE-wrenches] Combining Multiple Inverters
>>> Message-ID: <04f4b8fd-e280-4bf2-b5a4-c2fca8d1c...@millersolar.com>
>>> Content-Type: text/plain; charset="utf-8"
>>> 
>>> Not allowed. You need a dedicated OCPD. Plus seems like a really bad idea.  
>>> How do you shut down just one inverter?
>>> 
>>> 
>>> 
>>> Miller Solar
>> 
>> 
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Re: [RE-wrenches] No toxic sealant

[Jerry Shafer]

food grade silicone sealant, storage tanks use a rubber liners and that
material can be used as a gasket roofing suppliers will have this
Jerry


On Thu, Jun 26, 2014 at 1:07 PM, Drake  wrote:

>  Hello Wrenches,
>
> We are planning to install on a metal roof that rain water will be
> collected from. Usually we use butyl tape and a butyl base caulk to seal
> around the L-Feet. Is there a good method that would not require using
> toxic material to seal the feet on a metal roof.
>
> Thank you,
>
> Drake
>
> Drake Chamberlin
>
>
>
>
>
> *Athens Electric LLC OH License 44810 CO License 3773 NABCEP Certified
> Solar PV 740-448-7328 <740-448-7328> *http://athens-electric.com/
>
>
>
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Re: [RE-wrenches] Combining Multiple Inverters

[Glenn Burt]

How about 705.20 and 21?

 

 

From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of Corey Shalanski
Sent: Thursday, June 26, 2014 6:11 PM
To: re-wrenches@lists.re-wrenches.org
Subject: Re: [RE-wrenches] Combining Multiple Inverters

 

  

 ᐧ

Perhaps I should've been more specific with my scenario. I was imagining a 
supply side connection, as this would more commonly be the case when combining 
multiple inverters. In this case it seems like the provisions of 705.12(D) for 
load side conections don't even apply, no? Rather 705.12(A) becomes the 
relevant section, and I see very few restrictions there.

 

Even with a load side connection I would tend to agree with Jason's 
interpretation: Does the "source interconnection" in 705.12(D)(1) refer to each 
individual inverter, or can it refer to an aggregated "source"?

 

I am interested in pursuing this idea, mainly to understand how/where the NEC 
forbids it. In lieu of a clear Code reference against it, how is this any 
different from a branch circuit (in reverse)? ie, as with microinverters.

 

--

Corey Shalanski

Joule Energy

New Orleans, LA

   

 

On Thu, Jun 26, 2014 at 9:20 AM,  
wrote:


Message: 11
Date: Thu, 26 Jun 2014 09:10:07 -0400
From: Jason Szumlanski 
To: RE-wrenches 
Subject: Re: [RE-wrenches] Combining Multiple Inverters
Message-ID:

Content-Type: text/plain; charset="utf-8"

705.12(D) reads, "... the interconnection provisions for the
utility-interactive inverter(s) shall comply with (D)(1) through (D)(7)."
That's inverters - plural. The interconnection must be protected by
dedicated OCPD, not each inverter individually. Microinverters comply
because of this interpretation.

That said, I've never done it. An accumulator panel is pretty cost
effective when you consider the alternative cost of an enclosure and the
Polaris connectors. I guess if you are making the Polaris connections
inside the main load center or inside an inverter you can eliminate the
cost of a dedicated enclosure. There would be some material and labor
savings.

?If the inverter has a maximum OCPD rating, you will be limited by that.
?Microinverters "get around" that by the wire and inverter being
sized/rated for the entire maximum string.

Jason Szumlanski

?Fafco Solar?

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