[RE-wrenches] Large, off grid

Tue Aug 16 05:04:25 PDT 2011

Darryl, Bob and everyone else who helped,
   After careful consideration and much research and advice from all you
wrenches, my decision is to use Exeltech MX series inverters. They have
an almost tailor made solution for this system, redundancy built in,
"no down time" replacement of separate inverters and altogether a very
impressive 60 kw, three phase system. I will be looking for high end 48
volt battery chargers to run off the three phase gennie at the site, as
these inverters do not have built in charging capacity and I welcome
any suggestions. My concerns, as with the inverters and the BOS, is
that they have longevity in hot, salty environments. As with the MX
system, I want chargers with aluminum cases, conformally coated boards
and that use brass and stainless hardware. Any ideas?

Thanks for all you suggestions,
Daryl DeJoy
NABCEP Certified PV installer
Penobscot Solar Design

> On 8/15/2011 6:34 PM, Darryl Thayer wrote:
>> Hi wrenches, I have been informed off list that my system is not a
>> supported configuration, that one phase can be paralelled, but the
>> other two can not, one only on each of the other legs.  So unless
>> Outback comes back with more info, I was wrong.  (mine still works, it
>> was suggested I am very lucky)
>> I have used the Apollo in different configurations, stacked in single
>> phase, but I have not tried 3 phase stacks.  Maybe you could conact
>> Apollo.
>> Darryl
>>
>
>
> If you mean your system in Minneapolis, that is OK because they are only
> paralleled on the input (grid) side.
>
> You can have as many inverters as you want selling back to the grid
> (even on 3 phase) as you did...  Just can't parallel
> their outputs for off grid use when the power goes down.   Each inverter
> CAN drive its own AC branch load
> though.
>
> boB
>
>
>
>
>
>
>> *From:* Darryl Thayer <daryl_solar at yahoo.com>
>> *To:* RE-wrenches <re-wrenches at lists.re-wrenches.org>
>> *Cc:* Julie Haugh <jfh at greenhousepc.com>
>> *Sent:* Monday, August 15, 2011 10:43 AM
>> *Subject:* Re: [RE-wrenches] Large, off grid
>>
>> Another method is to use the 120 volt VFX 3648, with one master and 14
>> slaves. (15 total, 5 in paralled on each leg)  Check this with Outback
>> as the 3 phase is different now than it was back in 2003.  The three
>> phase was the master generated a square wave and each slave would use
>> this to lag either 120 or 240 degrees.  For standalone not grid tie.
>> I did a multi inverter on standalone 3 phase.
>> Also a good source for this might be  Julie Haugh
>> <jfh at greenhousepc.com <mailto:jfh at greenhousepc.com>>; She has done a
>> lot of work with Outbacks
>> Darryl
>>
>> *From:* jay peltz <jay at asis.com>
>> *To:* RE-wrenches <re-wrenches at lists.re-wrenches.org>
>> *Sent:* Friday, August 12, 2011 1:02 PM
>> *Subject:* Re: [RE-wrenches] Large, off grid
>>
>> Hi Daryl,
>>
>> You might look at the new Outback 8kw 120/240v
>>
>> I know that you can connect up to 10 in parallel,  i don't know if you
>> can do it 3 phase however.
>>
>> jay
>>
>> peltz power
>>
>>
>>
>>
>>
>>
>> On Aug 12, 2011, at 8:42 AM, penobscotsolar at midmaine.com
>> <mailto:penobscotsolar at midmaine.com> wrote:
>>
>> > Hello wrenches,
>> >  We have an opportunity to install a very large (60 kw) off grid
>> system
>> > in Mexico. It is currently three phase. I do have the option of
>> > changing out the air conditioners (36 of them) to 120 single phase,
>> but
>> > it is an added layer of complexity/cost that it would be nice to
>> avoid.
>> >  The largest off grid system I've done is 21 kw so far, and it was
>> > single phase and fairly straightforward.
>> >  Does anyone know of a three phase, off grid inverter than can be
>> > paralleled for 500 (possibly 450) amps oputput. I am currently dealing
>> > with three 120 volt lines (2/0) and a neutral, running to a
>> transformer
>> > to "clean up" the power from the gennie a bit. The client is
>> determined
>> > to do this as he has spent about $500,000.00 USD in diesel over the
>> > last 5 years.I would very much like to get that transformer out of the
>> > picture...
>> >  I am well versed in the complexities/pitfalls of battery systems this
>> > large. I'm planning on using the Surrette YS-31series to minimize the
>> > footprint, as well as use Water Miser caps and install three separate
>> > deionizing water systems. My issue is the inverters. I have seen a
>> > Korean inverter, Sunsine (http://www.dongeiecos.com/) that is capable
>> > of this, but I am not sure I want my first install of this inverter to
>> > be 3000 miles away....
>> >  Anyone?
>> >
>> > Thanks,
>> > Daryl DeJoy
>> > NABCEP Certified PV installer
>> > Penobscot Solar Design
>> >
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