[RE-wrenches] Feeding 160A 3PH to a 800A/800A Main Service

[John Stimac]

Pekka,
Does the 800A main panel have a main 800A breaker? If not, then couldn't you
install a 175A breaker? 
800 x 1.2 = 960A - (main breaker size) = Allowed PV breaker size.

We did a design for a project in Hawaii recently were we connected to a
208Y/120V 800A main panel with a 350A PV breaker.

--
John Stimac | Corvallis, OR
Renewable Energy Associates LLC
541-754-2001 Office/Fax
john at renewableassociates.com
www.renewableassociates.com


-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Pekka Laine
Sent: Monday, June 17, 2013 10:34
To: re-wrenches at lists.re-wrenches.org
Subject: [RE-wrenches] Feeding 160A 3PH to a 800A/800A Main Service

Dear Fellow Wrenches,

We have a small 50kW 120/208V commercial job with five 9kW 3PH inverters,
each outputting max. 25A.  We are landing those into a dedicated load center
with five 40A breakers. Doing the math, 5 x 25A x 1.25 = 156.25A, we would
need a 160A breaker.  This also equals to the maximum we can backfeed into a
800A/800A Main Service on the load side according to the "120%" rule.

The problem now is that we cannot locate any kind of 160A breaker or even a
160A fuse for a AC disconnect.

Has anybody ever done this without doing a "line-side tap?" It is hard to
believe that there wouldn't be an existing solution to landing maximum PV
into a 800A service. Are we missing something?

Any good ideas or comments would be appreciated.

Sincerely,

Pekka Laine

President
Photon Solar Power Inc.
www.PhotonSolarPower.com
Cell. 760-556-8170
Toll Free 888-SUN-ACDC
CA Lic. #933648
NABCEP Certified PV Installer # 032611-174
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