my idea for using a 3 phase panel [RE-wrenches]

[Todd Cory, Bald Mtn. Solar]

Wrenches,

I have had an idea for years and recently during a conversation with
another wrench this surfaced again so I thought I would throw it out
there for the "critics" to evaluate.   :)

Whenever I do a grid tied system with battery backup (SW4024 etc.) I add
a second breaker panel next to the original one and shift desired back
up load circuits over to the new panel which is fed from the inverter.
Since these panels are usually for 120/240 split phase use, the busses
get jumpered together for 120 volt only use... which really wastes the
second isolated pole since it is not needed.

SO... when using a 120 volt only inverter with new construction, I have
pondered the use of a 3 phase panel. Two of the poles could be for the
usual split phase 120/240 grid feed. The third pole could be used for
the 120 volt inverter feed. Neutrals and grounds all bonded in the same
place, and it has 2 major advantages. One is that it simply looks neater
having only one panel. The other nice thing is only ONE service
disconnect for the building. California requires external disconnects
for power, so this usually means labeling both building panels as
service disconnects "1 of 2" and "2 of 2" respectively.

The only downside I can think of in using a 3 phase panel is the cost.
They are way more than 2 split phase panels.

Other than being an unusual application, can anyone think of why this
idea would not work or be code legal?

Todd

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