[RE-wrenches] Enphase commercial

[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-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 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

nathan at arcticsun-llc.com  <mailto:nathan at 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-bounces at lists.re-wrenches.org
[mailto: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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