Re: [RE-wrenches] Enphase commercial

2013-10-04 Thread William Miller 
Friends:

 

What Nathan says is correct.  Allow me to add this tidbit:  I used to think
every third connector was wired to A-B, then B-C, and then A-C.  This is not
so.  The inverters select which phases to connect to by negotiation on
power-up.  I am not making this up!  This is what I was told..

 

William

 

 

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 12:28 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  <mailto:nat...@arcticsun-llc.com>  | (907)
457-1297

www.reina-llc.com <http://www.reina-llc.com/>  | www.arcticsun-llc.com
<http://www.arcticsun-llc.com/> 

 <http://www.facebook.com/ArcticSunLLC> 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] Enphase commercial

2013-10-04 Thread SunHarvest 
That works. Thanks Nathan!

Eric

- Original Message - 
  From: Nathan Stumpff 
  To: RE-wrenches 
  Sent: Thursday, October 03, 2013 12:28 PM
  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

2013-10-03 Thread 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] <http://www.facebook.com/ArcticSunLLC>**
> **
>
> ** **
>
> *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
>
> ___
> List sponsored by Home Power magazine
>
> List Address: RE-wrenches@lists.re-wrenches.org
>
> Change email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
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> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out participant bios:
> www.members.re-wrenches.org
>
>
>
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Re: [RE-wrenches] Enphase commercial

2013-10-03 Thread 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

 <http://www.holteksolar.com/> 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  <mailto:nat...@arcticsun-llc.com>  | (907)
457-1297

www.reina-llc.com <http://www.reina-llc.com/>  | www.arcticsun-llc.com
<http://www.arcticsun-llc.com/> 

 <http://www.facebook.com/ArcticSunLLC> 

 

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

2013-10-03 Thread 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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