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 <[email protected]> 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:* [email protected] [mailto: > [email protected]] *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:* [email protected] [ > mailto:[email protected]<[email protected]>] > *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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