[RE-wrenches] 208 3 phase Off Grid Inverter

[Ray Walters]

Its Mexico, so its 60 Hz, 3 phase 120/ 208.    I had originally 
considered the Radians for this project, until I went down and 
determined the actual voltage.

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

On 3/26/2014 7:31 AM, Phil Undercuffler wrote:
> You mentioned this is out of the country -- is it 230v line to 
> neutral, or 120/208?  OutBack's export Radian can do three phase, up 
> to 72kW continuous.
>
> HTH,
>
> Phil
>
>
>
>
> On Tuesday, March 25, 2014, Ray Walters <ray at solarray.com 
> <mailto:ray at solarray.com>> wrote:
>
>     OK everyone is steering me towards the Sunny Island.   I can
>     probably justify the inverter cost difference to the customer,
>     then I found the SMA Multicluster Box for the SI.  It seems like a
>     glorified AC Combiner and transfer switch box, but it retails for
>     over $20K! Yikes.
>     Do we have to use that for a 3 phase install, or are there much
>     lower cost alternatives.  This is out of the country and does not
>     need to be NEC2014 compliant.  (maybe NEC 1956 compliant would be
>     about in keeping with the rest of the wiring.......)  This would
>     be a budget buster for sure.
>
>     R.Ray Walters
>     CTO, Solarray, Inc
>     Nabcep Certified PV Installer,
>     Licensed Master Electrician
>     Solar Design Engineer
>     303 505-8760
>
>     On 3/25/2014 4:21 PM, Kevin Pegg wrote:
>
>         Hi Ray,
>
>         I have several 3-phase off-grid inverter/battery/generator
>         systems out there.
>
>         - SMA Sunny Island is the best. Can scale to at least 180 kW,
>         maybe more. Reliable & very solid. I have several sites going
>         over 2 years without a single second of power outage.
>         - Xantrex XW. It can work in a 3-ph config, but it's not as
>         stable system. We have taken to preventatively rebooting the
>         systems every 4 months and that helps a lot - at least the
>         outage can be planned and on our terms.
>         - Outback has had so many power quality nightmares I won't go
>         there anymore.
>         - I believe Magnum has a 3-ph option but haven't installed one
>         yet.
>
>         SMA inverters are more expensive. And they work very well.
>         They also have a very good battery charging algorithm and
>         integral gen start control.
>
>         Kevin
>
>         -----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: March 24, 2014 6:44 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,
>
>
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