[RE-wrenches] Specific AC Coupling question

[Jerry Shafer]

Wrenches
I have only been able to get the IG, the sma 1800 and 2500 to either run or
go off line not slow down like the SMA Island does, we did instead use a
600 volt contactor to turn off on of the strings instead, this was an ok
work around. The pv shed seemed better then freq shut downs all the time.
Jerry
On Apr 4, 2016 9:34 AM, "Allan Sindelar" <allan at sindelarsolar.com> wrote:

> Wrenches,
> Core question first: Will a ~2010 Fronius IG-4000 respond properly to the
> frequency shift regulation supplied by a new Schneider XW+5548 or XW+6848?
>
> Situation: I haven't seen the Colorado site; I'm working as a consultant
> to produce an upgrade component list and will later serve as a resource
> during local installation of the upgrade equipment. Customer has hired me
> to turn a hodgepodge system into a GTBB system. The system has two key
> parts: an existing SW5548 with batteries, never properly installed (only
> AC1 in was ever connected to a main load center!) with 3.1 kW of
> tracker-mounted PV through an Outback FM60; and a roof-mounted 4kW array
> feeding the grid panel via the IG-4000. As currently installed, nothing
> will operate as wired during a grid outage, and a 240V AC well pump isn't
> supported.
>
> The simple plan is to replace the SW5548 with an XW+5548 or 6848 with
> Midnite E-Panel; replace batteries with Surrette FLAs; keep existing arrays
> unchanged; use existing FM60 for smaller tracked array; use existing
> Fronius IG-4000 but AC couple it to the output of the XW. The customer
> understands that sell amperage is limited by the inverter (to 20A @ 240V
> for the 5548, or 4,800W, or 27A @ 240V for the 6848, or 6,480W) when the
> grid is up, but the full array can charge the battery bank when the grid is
> down.
>
> Schneider tech support assures me that the XW+ is good in this
> application, but I need to get an OK from Fronius about frequency-shift
> compatibility. Fronius tech support tells me that it may or may not work:
> the 0.4 hz shift is within the the normal frequency tolerance for this
> model. While the tolerance window may be tightened up in the field, such
> tightening may cause nuisance tripping, especially with reactive loads like
> a well pump or A/C. The tech suggested that we first test the
> frequency-shift approach, and add a DC-coil contactor between the output of
> the Fronius and the XW+ if it doesn't.
>
> Has anyone AC coupled these two units? Did it work? Any unexpected
> problems? Did you add a voltage-controlled contactor? What should I advise
> my client?
> Thank you,
> Allan
> --
>
> *Allan Sindelar*
> allan at sindelarsolar.com
> NABCEP Certified PV Installation Professional
> NABCEP Certified Technical Sales Professional
> New Mexico EE98J Journeyman Electrician
> Founder (Retired), Positive Energy, Inc.
> *505 780-2738 <505%20780-2738> cell*
>
>
>
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