[RE-wrenches] GT w/ BB

[Michael Morningstar]

I've been asked to build a back up system for a grid connected estate. We
haven't done many of these and I thought it best to ask those who have some
questions before I go about reinventing the wheel.

Here's the existing infrastructure.
1) 400amp Metered Main Distribution Panel with six 200amp feeders to
various sub-panels on the property
2) 400amp ATS and 100kw Kohler rapid response generator
3) 20kw ground mount array with (2) SE Inverters located at the array.
Feeder from array is 1,000 ft to Service. Six years old and wiring is janky.
4) Data logging for the last year shows peak demands of almost 40kw. This
could increase as several of formerly vacant  guest residences could be
occupied.

My go to is almost always Schneider, however in this instance when I looked
into a quad stack, or more It seems like some type of controller is needed
to prevent imbalanced current passing through the relays during transfer.
That left me a bit concerned. Has anyone successfully stacked 4 or more
XWPROs?

Then there is the matter of AC or DC coupling? I really want no part in
having anything to do with SE. The inverters are already looking pretty
weathered taking the brunt of the prevailing winds and storms (they are
mounted to one of the ground mount poles). Seems like a great waste to pull
out the 4/0 feeders and replace strings. My other hesitancy with AC
coupling is that we would lose PV monitoring and control.

I've also considered Sol Ark 15's, like three of them. We've got some SA
systems under are belt now and the only thing I can say that I like is the
speed of installation and the 200amp pass through. Other than that, they
leave me uninspired. One very large system continues to have glitches that
SA just shrugs their shoulders about. If we were to do three 15's, *what's
the preferred combining method?* All that I can come up with is a custom
400a panelboard w/ three 200a breakers.

Price is not a consideration for this project. The new owners of this
property (which is plagued with outages) have tasked me with building
something that is ultra reliable and good take over in a situation where
the grid is no longer available.

Any suggestions or tips are appreciated.

Michael

-- 

Michael Morningstar


Morningstar Electric

PO Box 1494

Mount Shasta, CA 96067

530-921-0560

mjmorningstar at gmail.com
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