Xantrex versus Sunny Boy [RE-wrenches]

[Marco]

I'm getting differing opinions on a design question that's leaving me in a
bit of a quandry.  I'm pursuing a 30 kW DC grid-tied system sale to the
local healthfood store here in Hilo, ~19 degrees north lattitude.  There's
3-phase 120/208 service at the store, so I'd like to use a single Xantrex
PV30208 inverter (and isolation transformer).  Since there's not enough roof
space on the due south face for all 30 kW, the array would be split roughly
equally among the southern, eastern and western faces of the roof.  Each
series  string of (12) 24V modules would be on one plane, i.e., no series
string would span two roof faces.  Now, I know very well that splitting this
system onto three planes is not ideal when using a single inverter.
However, I'd much prefer to use one inverter rather than (12) 3-phase
SB2500s.  Nor do I want to use three 10-kW PV10208 inverters--one each per
roof face.  So, my question to my esteemed PV wizards is, how poorly or
sub-optimally do you think such a system will perform?  Any of you out there
who have installed similar multi-plane, single-inverter systems?

tanks,
aloha,
marco

Marco Mangelsdorf
President
ProVision Technologies, Inc.
69 Railroad Avenue, Suite A-7
Hilo, Hawaii 96720 USA
(808) 969-3281, fax 934-7462
www.provisiontechnologies.com



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