[RE-wrenches] smaller 3-phase commercial inverters

[August Goers]

Hi All -

I just bumped into this 14 kW unit from Solectria which is 3 phase 208 v:

http://www.solren.com/products-and-services/grid-tied-solar-inverters/three-phase-transformerless-string-inverters/pvi-14-20tl-three-phase-transformerless-string-inverters/

I haven't tried these but thought they might be worth checking out. -August

*August Goers*

Principal

Luminalt Energy Corporation

o: 415.641.4000

m: 415.559.1525

www.luminalt.com




On Fri, Oct 18, 2013 at 9:45 AM, August Goers <august at luminalt.com> wrote:

> Hi Bill -
>
>
>
> Thanks, this is helpful info. Do you know how to calculate or approximate
> how we would keep the unbalanced voltage to less than 3%? I guess I need to
> check out ANSI/C84.1-2011 but I thought maybe there are some ballpark rules
> of thumb.
>
>
>
> Thanks,
>
>
>
> August
>
>
>
>
>
> *August Goers*
>
> Luminalt Energy Corporation
>
> o: 415.641.4000
>
> m: 415.559.1525
>
>
>
> *From:* re-wrenches-bounces at lists.re-wrenches.org [mailto:
> re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of *Bill Brooks
> *Sent:* Friday, October 18, 2013 9:27 AM
> *To:* 'RE-wrenches'
> *Subject:* Re: [RE-wrenches] smaller 3-phase commercial inverters
>
>
>
> Marco,
>
>
>
> Besides the good responses you have already received, 20-30kW, 480V
> machines are really targeting larger installations that would be on
> facilities with 480V. I would generally not build a system with 480V
> inverters on a 208V service. For large systems, there are large inverters
> running at 208V, for small systems there are plenty of single-phase units
> that would work just fine. Incidentally, read the new NEC 705.100 in the
> 2014 code. It clarifies that utilities should not be disallowing
> single-phase units on a 3-phase service. The typical utility concerns do
> not understand how the equipment works.
>
>
>
> *(A) Single Phase. *Single-phase inverters for hybrid systems
>
> and ac modules in interactive hybrid systems shall be
>
> connected to three-phase power systems in order to limit
>
> unbalanced voltages to not more than 3 percent.
>
>
>
> Informational Note: For utility-interactive single-phase inverters,
>
> unbalanced voltages can be minimized by the same
>
> methods that are used for single-phase loads on a three- phase
>
> power system. See ANSI/C84.1-2011, *Electric Power Systems*
>
> *and Equipment — Voltage Ratings (60 Hertz)*.
>
>
>
> This is a huge change from the way it was previously written. You can
> thank me next time I see you with a beer. This was my proposal.
>
>
>
> Bill.
>
>
>
> *From:* re-wrenches-bounces at lists.re-wrenches.org [
> mailto:re-wrenches-bounces at lists.re-wrenches.org<re-wrenches-bounces at lists.re-wrenches.org>]
> *On Behalf Of *Marco Mangelsdorf
> *Sent:* Thursday, October 17, 2013 9:31 PM
> *To:* 'RE-wrenches'
> *Subject:* [RE-wrenches] smaller 3-phase commercial inverters
>
>
>
> Yeah, lots more choices out there in the 10+ to 30 kW range….but pretty
> much all of the larger capacity models only come at 480V.
>
>
>
> Anyone know why?  We have way more 120/208V applications here in Hawaii
> than 277/480.
>
>
>
> marco
>
>
>
> Chris Mason wrote:
>
>
>
> >SMA just came out with their Sunny Tripower line for the US.
>
>
>
> Yes those are interesting. But they are only for 480 Wye, not 240
> Delta.....
>
> Is the Fronius 11.4-3 the only 3-phase inverter that can work with 240
> 3-phase with a hi-leg (stinger)?
>
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