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

[Pekka Laine]

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