[RE-wrenches] Enphase commercial

Jason Szumlanski jason at fafcosolar.com
Thu Oct 3 15:28:51 PDT 2013


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 <Holtek at sbcglobal.net> 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-bounces at lists.re-wrenches.org [mailto:
> re-wrenches-bounces at 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****
>
> nathan at 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-bounces at lists.re-wrenches.org [
> mailto:re-wrenches-bounces at lists.re-wrenches.org<re-wrenches-bounces at 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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