Also worth looking at Magnum's new AC diversion load system. It does
the frequency shifting but also 4 kw dump load that can be set up to any
AC electric load.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 4/4/2016 6:45 PM, jay wrote:
HI Allan,
The only reason to frequency shift is for “softer” charging.
VRLA are not as sensitive to the pulse type charging that a relay type
charging would do.
And regardless if you have frequency shift or not, you will still need
( especially with VRLA) a high voltage relay.
I recommend a SS relay, but a regular mechanical contactor will do as
well.
jay
Peltz Power.
On Apr 4, 2016, at 12:34 PM, Allan Sindelar <al...@sindelarsolar.com
<mailto:al...@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*
al...@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 cell*
**
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