[RE-wrenches] smaller 3-phase commercial inverters

[August Goers]

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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