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Wrenches,<br>
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?<br>
<br>
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.<br>
<br>
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.<br>
<br>
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.<br>
<br>
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?<br>
Thank you,<br>
Allan<br>
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<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a
href="mailto:allan@sindelarsolar.com"><a class="moz-txt-link-abbreviated" href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a></a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <span style="mso-bidi-font-weight:bold">Positive
Energy,
Inc.</span><br>
<b>505 780-2738 cell</b><br
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