[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
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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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