[RE-wrenches] 208 3 phase Off Grid Inverter

[William Miller]

Ray

Sunny Island or XW.

Wm

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Ray Walters
Sent: Monday, March 24, 2014 7:44 PM
To: RE-wrenches
Subject: [RE-wrenches] 208 3 phase Off Grid Inverter

Hi All;

I'm exploring options for an off grid project with an existing 30 Kw Kohler
wired for 208 vac 3 phase.  The generator runs some 8 hp air compressors, so
rewiring it is not an option.  We're primarily interested in reducing gen
run time from the current situation: 14 hrs/ day.
So far, only the Outback VFX inverters seem capable of being wired in 208, 3
phase, but according to the manual they can only be stacked 1 inverter per
leg. This limits the system to only 3 inverters total, or
10.8 kW.  I would like expandability beyond this.
1) are there any other inverters available that I'm over looking?
2) Should I consider a transformer to convert from 208 vac/3phase to 240
vac/ singe phase?

We're not going to even try to run the compressors, just the other single
phase loads, mostly 120 vac, but we have a couple of small air conditioners,
that are currently running on 208 single phase.  I believe they would run
fine on 240 vac, as they have a name plate rating at 230 vac.
3) We may possibly run 2 separate 3 inverter stacks and only tie together at
the battery, but otherwise they would not be connected. This seems
inefficient, and would require some load balancing of the various inverters.

All help and discussion is greatly appreciated as always,

--
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

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