[RE-wrenches] Eaton bolt on panel modifications

[William Miller]

Friends:

 

I need to modify an Eaton 400 amp panelboard for an industrial off-grid
system.  I need 3 150 amp 2 pole breakers and a few of the clips used to
connect the bolt-on breakers to the busses ("Provisions," they are called).

 

I was informed by the Eaton rep that the cost to replace the entire interior
of the panelboard was cheaper than buying a few clips.  It was explained
that buying "loose parts" was more expensive than buying an entire bus
system.  I just cannot believe this.  

 

Has anyone purchased the clips for Eaton before?  Know a good Eaton dealer?

 

Thanks in advance.

 

William Miller

 

 

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Re: [RE-wrenches] parallel stacking SW

[William Miller]

Mac:

 

I approached this problem some years ago and posted about it on this forum.
What I heard is that, yes, it can be done.  The actual process is known by a
few former Trace engineers and could not be divulged due to confidentiality
agreements signed when Outback split off from Xantrex (or Trace, if that is
what it was called at the time).  If you know a former Trace Engineer, you
might be able to wrest the information out of them if the stature of
limitations has expired.

 

Of course I was not satisfied with “this information is only is for some to
know,” so I worked on the problem.  My idea is to connect two inverters in
series and then feed them into the AC1 inputs of two more inverters in
parallel.  Since the SW inverters can provide true “Gen Support” mode, the
downstream inverters can assist the upstream inverters, therefore providing
the gross power of all four inverters.  See this page
  for
a drawing.Look about halfway down the page for Cascading SW inverters.

 

Now I have come up with some pretty strange ideas in my time, but I think
this is one of the more wacky, but actually possible solutions.  I never had
the chance to test this scheme, but I would love to know if it would
actually work.

 

William

 

PS:  Just as I was finishing this email I remembered the situation I was
trying to correct. The other idea is here:  Link
   I don’t recommend this technique for the reasons stated
on the web site, but there may the germ of an idea that may work.  It would
have to do with feeding a transformer from opposite ends with paralleled
inverters.  How to keep them in sync…

 

Good Luck,

 

William Miller

 

 

 

From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Mac Lewis
Sent: Wednesday, October 02, 2013 8:01 AM
To: RE-wrenches
Subject: [RE-wrenches] parallel stacking SW

 

Hi wrenches,

 

I have some folks that I'm meeting in a couple of days that have 4 Trace SW
5048 inverters.  It's a very large, older compound-style installation that
the original installer has bailed on.  They have it set up so that there is
a common battery bank and each pair of series stacked inverters are
independently feeding 2 separate 120/240 busses.  One of these 120/240
services gets utilized very heavily, and one isn't really used at all.  Is
it possible with this type of inverter, to have all four inverters feeding a
common AC bus, two feed Phase A and the other two feeding phase B?

 

I know that is possible to series stack and to parallel stack this inverter,
but can you do both at the same time?

 

If so, does anyone have a pin out to a parallel stacking cable?

 

Thanks in advance

 

-- 

 

 

 

Mac Lewis

"Yo solo sé que no sé nada." -Sócrates

  _  

No virus found in this message.
Checked by AVG - www.avg.com
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Re: [RE-wrenches] Sealing roof vent

[Jesse Dahl]

I've always just plugged the old hole completely with plywood of the same 
thickness and shingled over it with a "matching" shingle. Only when it's under 
the array and I'm re-routing the vent. That has always seemed like the most 
professional way of doing it in my opinion. 

Maybe that's not the situation you are facing though. 

Jesse

Sent from my iPhone

> On Oct 3, 2013, at 8:02 AM, Drake  
> wrote:
> 
> Hello Wrenches,
> 
> We are moving a roof vent. My plumber suggested that we cut the old one and 
> cap it instead of having to repair the roof. I'm not sure a capped vent would 
> be short enough to fit under the array.  
> 
> What if we were to cut the vent off at the flashing level and plug the pipe. 
> A rubber plug could be put in and topped with hydraulic water-stop cement. 
> Neoprene roof sealant could be spread on top of that.
> 
> Has anyone tried anything like that? Are there any other good options? Can 
> you see any issues with this method?
> 
> Thanks,
> 
> 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] SunBandit Hybrid Solar Water Heater

[Larry Crutcher, Starlight Solar Power Systems]

That was one of my thoughts. It must be very advanced control to know when NOT 
to use utility power. Of course one could switch off the grid power….but then 
how well does it function without it?

Just add a few more sub $1 per watt PV modules, a high efficiency electric 
water heater and let the inverters do the job. And of course there is always 
propane.

If anyone installs one of these, let us know.

Larry

On Oct 3, 2013, at 6:16 PM, jay peltz  wrote:

Hi Jason

I would only add that this continues the issue with single tank solar/ grid 
combos
IE it's hard to make sure the heat is coming from solar, as the tank has the 
thermostat from the grid side as well. 

It's a solution still looking for a problem. 

Jay

Peltz power




On Oct 3, 2013, at 1:13 PM, Jason Szumlanski  wrote:

> Anyone else getting inundated with SunBandit Hybrid Solar Water Heating 
> System marketing emails? Any first impressions? Here are my initial thoughts:
> 
> Pros - provides hot water in utility outages, no interconnection hassles, 
> possibly easier permitting hurdles, eliminates moving parts in active SDHW 
> systems
> Cons - no grid-tie, any excess energy produced is wasted, AHJs won't know how 
> to categorize equipment for permitting and may chargesolar water heating and 
> PV permits and inspections
> 
> I haven't dug too deep, but one strange thing I think I saw on a spec sheet 
> was that the "micro-AC Grid" (aka microinverter) is UL 1703. If that is the 
> case, how does the PV continue to provide water heating in a utility outage? 
> What I really don't understand is why there is a need for a microinverter at 
> all? Why not just use a DC element? I guess a microinverter, despite minor 
> efficiency losses, is cheaper than a load controller.
> 
> Jason Szumlanski
> Fafco Solar
> ___

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Re: [RE-wrenches] SunBandit Hybrid Solar Water Heater

[jay peltz]

Hi Jason

I would only add that this continues the issue with single tank solar/ grid 
combos
IE it's hard to make sure the heat is coming from solar, as the tank has the 
thermostat from the grid side as well. 

It's a solution still looking for a problem. 

Jay

Peltz power




> On Oct 3, 2013, at 1:13 PM, Jason Szumlanski  wrote:
> 
> Anyone else getting inundated with SunBandit Hybrid Solar Water Heating 
> System marketing emails? Any first impressions? Here are my initial thoughts:
> 
> Pros - provides hot water in utility outages, no interconnection hassles, 
> possibly easier permitting hurdles, eliminates moving parts in active SDHW 
> systems
> Cons - no grid-tie, any excess energy produced is wasted, AHJs won't know how 
> to categorize equipment for permitting and may chargesolar water heating and 
> PV permits and inspections
> 
> I haven't dug too deep, but one strange thing I think I saw on a spec sheet 
> was that the "micro-AC Grid" (aka microinverter) is UL 1703. If that is the 
> case, how does the PV continue to provide water heating in a utility outage? 
> What I really don't understand is why there is a need for a microinverter at 
> all? Why not just use a DC element? I guess a microinverter, despite minor 
> efficiency losses, is cheaper than a load controller.
> 
> Jason Szumlanski
> Fafco Solar
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Re: [RE-wrenches] Enphase commercial

[Jason Szumlanski]

I agree with needing to read the center-tap paper. However, we have found
that it's sometimes just as easy and cost effective to use shorter strings
and combine in AC load centers for a run to the interconnection point. It
depends on the layout and how many splices and j-boxes you would need.

Come to think of it... that really applies more to 240Vac service. 3-pole
breakers and panels are more pricey.

Jason
Szumlanski

Fafco Solar





On Thu, Oct 3, 2013 at 3:53 PM, Holt Kelly  wrote:

> Be sure to read Enphase’s tech sheet on center tap of branch circuits.  **
> **
>
> ** **
>
> Holt E. Kelly
>
> Holtek Fireplace & Solar Products
>
> 500 Jewell Dr.
>
> Waco, TX 76712
>
> www.holteksolar.com
>
> 254-751-9111
>
> ** **
>
> *From:* re-wrenches-boun...@lists.re-wrenches.org [mailto:
> re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of *Nathan Stumpff
> *Sent:* Thursday, October 03, 2013 2:28 PM
> *To:* RE-wrenches
> *Subject:* Re: [RE-wrenches] Enphase commercial
>
> ** **
>
> Hi Eric,
>
> ** **
>
> It is 25 inverters on a 20A circuit, but only on 208 three phase. Each
> micro connects to the cable in an alternating way (L1/L2, then L2/L3, then
> L3/L1, etc.) so with 25 micros there are either 8 or 9 micros on each
> combination.
>
> ** **
>
> 9 x 1.0 A x 1.732 (square root of 3) x 1.25 = 19.48 A = 20 A breaker
>
> ** **
>
> Cheers,
>
> -Nathan
>
> ** **
>
> --
>
> Nathan J. Stumpff
>
> NABCEP Certified PV Installation Professional #091209-175
>
> NABCEP Certified Solar Heating Installer #032412-14
>
> Project Manager | Arctic Sun, LLC
>
> nat...@arcticsun-llc.com  | (907) 457-1297
>
> www.reina-llc.com | www.arcticsun-llc.com
>
> [image: Description: ZA102637861] **
> **
>
> ** **
>
> *From:* re-wrenches-boun...@lists.re-wrenches.org [
> mailto:re-wrenches-boun...@lists.re-wrenches.org]
> *On Behalf Of *SunHarvest
> *Sent:* Thursday, October 03, 2013 10:52 AM
> *To:* RE-wrenches
> *Subject:* [RE-wrenches] Enphase commercial
>
> ** **
>
> Hey Wrenches & Nick Soleil (with whom I worked at APS for a time I
> believe...),
>
>  
>
> I'm not familiar with Enphase commercial applications and am currently
> working through a commercial design. Enphase, on their M215 datasheets
> claim up to 25 micros per branch, at 1.0A each, with each branch
> terminating at a 20A breaker. By my calculations, 25 micros at 1.0A each
> (25A*1.25=31.25A) need to terminate at a 40A breaker. Anyone know what I'm
> missing or know how the 20A breaker design gets past the AHJ?
>
>  
>
> Eric Stikes
> SunHarvest
>
> (530) 798-3738
>
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Re: [RE-wrenches] SunBandit Hybrid Solar Water Heater

[Jason Szumlanski]

Your point about Romex is a good one, but hardly worth the cost of an
inverter I would think... I'd have to do that math... Yes, I meant 1741,
and forgot that covered standalone inverters as well... Been away from
off-grid too long!

To Larry's point, I agree that the cost posted online is unworkable, but I
was under the impression that dealers could get discounted pricing from
what's shown online. When you look at the cost of a standard tank,
microinverter, and PV, it should be much, much less.

Jason



On Thu, Oct 3, 2013 at 4:25 PM, Dave Click  wrote:

> There are similar systems available to this one. I think you mean that the
> inverter is UL 1741, but the system is not grid-interactive. Stand-alone
> inverters can be listed to 1741 as well.
>
> IIRC, when I saw them at SPI 2012 they were doing everything in DC. They
> may have switched to AC so they could use romex rather than EMT?
>
>
>
> On 2013/10/3 16:13, Jason Szumlanski wrote:
>
>> Anyone else getting inundated with SunBandit Hybrid Solar Water Heating
>> System marketing emails? Any first impressions? Here are my initial
>> thoughts:
>>
>> Pros - provides hot water in utility outages, no interconnection
>> hassles, possibly easier permitting hurdles, eliminates moving parts in
>> active SDHW systems
>> Cons - no grid-tie, any excess energy produced is wasted, AHJs won't
>> know how to categorize equipment for permitting and may charge for solar
>> water heating and PV permits and inspections
>>
>> I haven't dug too deep, but one strange thing I think I saw on a spec
>> sheet was that the "micro-AC Grid" (aka microinverter) is UL 1703. If
>> that is the case, how does the PV continue to provide water heating in a
>> utility outage? What I really don't understand is why there is a need
>> for a microinverter at all? Why not just use a DC element? I guess a
>> microinverter, despite minor efficiency losses, is cheaper than a load
>> controller.
>>
>> Jason Szumlanski
>> Fafco Solar
>>
>>
>> __**_
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Re: [RE-wrenches] Sealing roof vent

[Benn At DayStarSolar]

Drake,
If you are relocating the vent and abandoning the existing hole then could you 
not just cut the vent flush to the roof or cut it right out and slide a 
"flashing" up under the above shingles to cover the hole, rather than plugging 
and filling the vent?

Or...
Given the pitch of the roof and the height of the array off the roof surface, 
can you cut the vent as low as possible to cap it and seal the cap (PVC cement 
if a PVC pipe). 

benn
Sent from a 'smart' phone, with touch screen keys. Please excuse shortcuts and 
typos. 

On 2013-10-03, at 3:45 PM, Drake  wrote:

> Hi Max and Bill,
> 
> Thanks for your input. The actual plumbing vent will be rerouted to go out of 
> the north pitch of the roof.  There will only be a an open pipe left in the 
> attic. The main issue is finding ways of keeping water out of the vent pipe 
> (now abandoned) and getting it short enough to fit under the array. I think a 
> cap on the pipe would make it too high, so I'm looking for other ways to seal 
> it. 
> 
> Drake 
> 
> At 11:19 AM 10/3/2013, you wrote:
>> Content-Type: multipart/alternative;
>>  boundary="=_NextPart_000_0020_01CEC022.1E610960"
>> Content-Language: en-us
>> 
>> So this is a plumbing vent instead of a furnace or hot water exhaust vent? 
>> I’ve used Fernco rubber caps on unused vents, with the screw down pipe 
>> clamps around the bottom. Also these are just to allow air into the vent so 
>> draining water doesn’t create a vacuum so I suspect there is little to be 
>> concerned about with cutting them off just above the roof flashing and 
>> allowing enough room over the top to allow air to flow into it. On a three 
>> inch vent that is only ¾” to equal the surface area of the pipe. The top of 
>> the flashing is protected by the module over its top. Over time would there 
>> be sewer gases which might cause trouble on the back sheet of the module? I 
>> don’t know.
>>  
>> Bill Dorsett
>> Manhattan, KS
>>  
>> From: re-wrenches-boun...@lists.re-wrenches.org [ 
>> mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Drake
>> Sent: Thursday, October 03, 2013 8:03 AM
>> To: RE-wrenches
>> Subject: [RE-wrenches] Sealing roof vent
>>  
>> Hello Wrenches,
>> 
>> We are moving a roof vent. My plumber suggested that we cut the old one and 
>> cap it instead of having to repair the roof. I'm not sure a capped vent 
>> would be short enough to fit under the array.  
>> 
>> What if we were to cut the vent off at the flashing level and plug the pipe. 
>> A rubber plug could be put in and topped with hydraulic water-stop cement. 
>> Neoprene roof sealant could be spread on top of that.
>> 
>> Has anyone tried anything like that? Are there any other good options? Can 
>> you see any issues with this method?
>> 
>> Thanks,
>> 
>> 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] Sealing roof vent

[Drake]

Hi Max and Bill,

Thanks for your input. The actual plumbing vent 
will be rerouted to go out of the north pitch of 
the roof.  There will only be a an open pipe left 
in the attic. The main issue is finding ways of 
keeping water out of the vent pipe (now 
abandoned) and getting it short enough to fit 
under the array. I think a cap on the pipe would 
make it too high, so I'm looking for other ways to seal it.


Drake

At 11:19 AM 10/3/2013, you wrote:

Content-Type: multipart/alternative;
boundary="=_NextPart_000_0020_01CEC022.1E610960"
Content-Language: en-us

So this is a plumbing vent instead of a furnace 
or hot water exhaust vent? I’ve used Fernco 
rubber caps on unused vents, with the screw down 
pipe clamps around the bottom. Also these are 
just to allow air into the vent so draining 
water doesn’t create a vacuum so I suspect there 
is little to be concerned about with cutting 
them off just above the roof flashing and 
allowing enough room over the top to allow air 
to flow into it. On a three inch vent that is 
only ¾” to equal the surface area of the pipe. 
The top of the flashing is protected by the 
module over its top. Over time would there be 
sewer gases which might cause trouble on the 
back sheet of the module? I don’t know.


Bill Dorsett
Manhattan, KS

From: re-wrenches-boun...@lists.re-wrenches.org 
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Drake

Sent: Thursday, October 03, 2013 8:03 AM
To: RE-wrenches
Subject: [RE-wrenches] Sealing roof vent

Hello Wrenches,

We are moving a roof vent. My plumber suggested 
that we cut the old one and cap it instead of 
having to repair the roof. I'm not sure a capped 
vent would be short enough to fit under the array.


What if we were to cut the vent off at the 
flashing level and plug the pipe. A rubber plug 
could be put in and topped with hydraulic 
water-stop cement. Neoprene roof sealant could be spread on top of that.


Has anyone tried anything like that? Are there 
any other good options? Can you see any issues with this method?


Thanks,

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-wrenches] Pricing out 100kW systems

[Advanced Energy Solutions]

Anyone have a good pricing comparison for a 100kW attached to a flat roof
using stand offs versus a ballasted mount?

Equivalent on the labor?


-- 
Stay Energized, PEACE>
Aur J Beck,
NABCEP Certified Solar PV Installer™ 032611-24
NABCEP Certified PV Technical Sales™ PVTS032412-6
chief tech of Energy Network (Green Geek Squad*™ *)
Advanced Energy Solutions Group, Inc
(618) 893-1717 | (800) 229-0453  | www.AESsolar.com|
t...@aessolar.com 

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Re: [RE-wrenches] SunBandit Hybrid Solar Water Heater

[Dave Click]

There are similar systems available to this one. I think you mean that 
the inverter is UL 1741, but the system is not grid-interactive. 
Stand-alone inverters can be listed to 1741 as well.


IIRC, when I saw them at SPI 2012 they were doing everything in DC. They 
may have switched to AC so they could use romex rather than EMT?



On 2013/10/3 16:13, Jason Szumlanski wrote:

Anyone else getting inundated with SunBandit Hybrid Solar Water Heating
System marketing emails? Any first impressions? Here are my initial
thoughts:

Pros - provides hot water in utility outages, no interconnection
hassles, possibly easier permitting hurdles, eliminates moving parts in
active SDHW systems
Cons - no grid-tie, any excess energy produced is wasted, AHJs won't
know how to categorize equipment for permitting and may charge for solar
water heating and PV permits and inspections

I haven't dug too deep, but one strange thing I think I saw on a spec
sheet was that the "micro-AC Grid" (aka microinverter) is UL 1703. If
that is the case, how does the PV continue to provide water heating in a
utility outage? What I really don't understand is why there is a need
for a microinverter at all? Why not just use a DC element? I guess a
microinverter, despite minor efficiency losses, is cheaper than a load
controller.

Jason Szumlanski
Fafco Solar


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[RE-wrenches] SunBandit Hybrid Solar Water Heater

[Jason Szumlanski]

Anyone else getting inundated with SunBandit Hybrid Solar Water Heating
System marketing emails? Any first impressions? Here are my initial
thoughts:

Pros - provides hot water in utility outages, no interconnection hassles,
possibly easier permitting hurdles, eliminates moving parts in active SDHW
systems
Cons - no grid-tie, any excess energy produced is wasted, AHJs won't know
how to categorize equipment for permitting and may charge for solar water
heating and PV permits and inspections

I haven't dug too deep, but one strange thing I think I saw on a spec sheet
was that the "micro-AC Grid" (aka microinverter) is UL 1703. If that is the
case, how does the PV continue to provide water heating in a utility
outage? What I really don't understand is why there is a need for a
microinverter at all? Why not just use a DC element? I guess a
microinverter, despite minor efficiency losses, is cheaper than a load
controller.

Jason Szumlanski
Fafco Solar
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Re: [RE-wrenches] Enphase commercial

[Holt Kelly]

Be sure to read Enphase's tech sheet on center tap of branch circuits.  

 

Holt E. Kelly

Holtek Fireplace & Solar Products

500 Jewell Dr.

Waco, TX 76712

  www.holteksolar.com

254-751-9111

 

From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Nathan
Stumpff
Sent: Thursday, October 03, 2013 2:28 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Enphase commercial

 

Hi Eric,

 

It is 25 inverters on a 20A circuit, but only on 208 three phase. Each micro
connects to the cable in an alternating way (L1/L2, then L2/L3, then L3/L1,
etc.) so with 25 micros there are either 8 or 9 micros on each combination.

 

9 x 1.0 A x 1.732 (square root of 3) x 1.25 = 19.48 A = 20 A breaker

 

Cheers,

-Nathan

 

--

Nathan J. Stumpff

NABCEP Certified PV Installation Professional #091209-175

NABCEP Certified Solar Heating Installer #032412-14

Project Manager | Arctic Sun, LLC

nat...@arcticsun-llc.com    | (907)
457-1297

www.reina-llc.com   | www.arcticsun-llc.com
 

  

 

From: re-wrenches-boun...@lists.re-wrenches.org

[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of SunHarvest
Sent: Thursday, October 03, 2013 10:52 AM
To: RE-wrenches
Subject: [RE-wrenches] Enphase commercial

 

Hey Wrenches & Nick Soleil (with whom I worked at APS for a time I
believe...),

 

I'm not familiar with Enphase commercial applications and am currently
working through a commercial design. Enphase, on their M215 datasheets claim
up to 25 micros per branch, at 1.0A each, with each branch terminating at a
20A breaker. By my calculations, 25 micros at 1.0A each (25A*1.25=31.25A)
need to terminate at a 40A breaker. Anyone know what I'm missing or know how
the 20A breaker design gets past the AHJ?

 

Eric Stikes
SunHarvest

(530) 798-3738

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Re: [RE-wrenches] Enphase commercial

[Nathan Stumpff]

Hi Eric,

It is 25 inverters on a 20A circuit, but only on 208 three phase. Each micro 
connects to the cable in an alternating way (L1/L2, then L2/L3, then L3/L1, 
etc.) so with 25 micros there are either 8 or 9 micros on each combination.

9 x 1.0 A x 1.732 (square root of 3) x 1.25 = 19.48 A = 20 A breaker

Cheers,
-Nathan

--
Nathan J. Stumpff
NABCEP Certified PV Installation Professional #091209-175
NABCEP Certified Solar Heating Installer #032412-14
Project Manager | Arctic Sun, LLC
nat...@arcticsun-llc.com   | (907) 457-1297
www.reina-llc.com | 
www.arcticsun-llc.com
[cid:image001.png@01CEC02A.F733F560]

From: re-wrenches-boun...@lists.re-wrenches.org 
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of SunHarvest
Sent: Thursday, October 03, 2013 10:52 AM
To: RE-wrenches
Subject: [RE-wrenches] Enphase commercial

Hey Wrenches & Nick Soleil (with whom I worked at APS for a time I believe...),

I'm not familiar with Enphase commercial applications and am currently working 
through a commercial design. Enphase, on their M215 datasheets claim up to 25 
micros per branch, at 1.0A each, with each branch terminating at a 20A breaker. 
By my calculations, 25 micros at 1.0A each (25A*1.25=31.25A) need to terminate 
at a 40A breaker. Anyone know what I'm missing or know how the 20A breaker 
design gets past the AHJ?

Eric Stikes
SunHarvest
(530) 798-3738
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[RE-wrenches] Enphase commercial

[SunHarvest]

Hey Wrenches & Nick Soleil (with whom I worked at APS for a time I believe...),

I'm not familiar with Enphase commercial applications and am currently working 
through a commercial design. Enphase, on their M215 datasheets claim up to 25 
micros per branch, at 1.0A each, with each branch terminating at a 20A breaker. 
By my calculations, 25 micros at 1.0A each (25A*1.25=31.25A) need to terminate 
at a 40A breaker. Anyone know what I'm missing or know how the 20A breaker 
design gets past the AHJ?

Eric Stikes
SunHarvest
(530) 798-3738___
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Re: [RE-wrenches] Sealing roof vent

[Max Balchowsky]

Are you talking plumbing vent or attic vent? Either can be moved, but we have 
simply cut plumbing vents to be under the array where the jurisdiction will 
allow. I wouldn't "seal" a plumbing vent.
Attic vents we lower and sceen to keep critters out but still allow venting.
 
Max Balchowsky
Design Engineer
SEE Systems
1048 Irvine Ave Suite 217
Newport Beach, Ca. 92660
760-403-6810


"Building a Better Future For The Next Generation"

To:RE-wrenches  

Sent: Thursday, October 3, 2013 6:02 AM
Subject: [RE-wrenches] Sealing roof vent
 


Hello Wrenches,

We are moving a roof vent. My plumber suggested that we cut the old one
and cap it instead of having to repair the roof. I'm not sure a capped
vent would be short enough to fit under the array.  

What if we were to cut the vent off at the flashing level and plug the
pipe. A rubber plug could be put in and topped with hydraulic water-stop
cement. Neoprene roof sealant could be spread on top of that.

Has anyone tried anything like that? Are there any other good options?
Can you see any issues with this method?

Thanks,

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] Sealing roof vent

[William Dorsett]

So this is a plumbing vent instead of a furnace or hot water exhaust vent?
I’ve used Fernco rubber caps on unused vents, with the screw down pipe
clamps around the bottom. Also these are just to allow air into the vent so
draining water doesn’t create a vacuum so I suspect there is little to be
concerned about with cutting them off just above the roof flashing and
allowing enough room over the top to allow air to flow into it. On a three
inch vent that is only ¾” to equal the surface area of the pipe. The top of
the flashing is protected by the module over its top. Over time would there
be sewer gases which might cause trouble on the back sheet of the module? I
don’t know.

 

Bill Dorsett

Manhattan, KS

 

From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Drake
Sent: Thursday, October 03, 2013 8:03 AM
To: RE-wrenches
Subject: [RE-wrenches] Sealing roof vent

 

Hello Wrenches,

We are moving a roof vent. My plumber suggested that we cut the old one and
cap it instead of having to repair the roof. I'm not sure a capped vent
would be short enough to fit under the array.  

What if we were to cut the vent off at the flashing level and plug the pipe.
A rubber plug could be put in and topped with hydraulic water-stop cement.
Neoprene roof sealant could be spread on top of that.

Has anyone tried anything like that? Are there any other good options? Can
you see any issues with this method?

Thanks,

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-wrenches] Sealing roof vent

[Drake]

Hello Wrenches,

We are moving a roof vent. My plumber suggested that we cut the old 
one and cap it instead of having to repair the roof. I'm not sure a 
capped vent would be short enough to fit under the array.


What if we were to cut the vent off at the flashing level and plug 
the pipe. A rubber plug could be put in and topped with hydraulic 
water-stop cement. Neoprene roof sealant could be spread on top of that.


Has anyone tried anything like that? Are there any other good 
options? Can you see any issues with this method?


Thanks,

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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