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<tt>The frequency shift will only taper charge using all SMA equipment
and an RS-485 Data Module and data cables. With all other brands of grid
tie inverters, the Sunny Island will trigger and on / off charge
scenario. <br><br>
</tt>At 12:09 AM 4/5/2016, you wrote:<br>
<blockquote type=cite class=cite cite="">Hi Allen,<br><br>
I would recommend a contactor to disconnect to Fronius at high SOC (or
voltage). It's pretty inexpensive to do it and most of the battery
based manufacturers recommend it.<br><br>
I may be misunderstanding Jay, but I believe that the frequency shift in
this case would create an on/off type of charging, meant only to kick the
Fronius off-line. I wouldn't worry much about that because the
FM60 can perform the Absorb and float parts of the charge cycle.
You may consider putting in a Conext battery monitor and using that to
trigger a relay at high SOC (rather than voltage) and isolate the Fronius
as failsafe. To me, that is preferable over the relying solely on
the frequency shift.<br><br>
I am definitely cautious about AC coupling different manufacturers so
please keep us in the loop as to how it works out and if you learn
anything. It's an interesting grey area, because accountability
really does rest on the installer even if the manufactures suggest it
will/should work. What do you do if it doesn't? Perhaps
there is a specification that would clarify if AC coupling would
work. I read somewhere that grid-tied inverters that test grid
impedance will find that the battery based inverters have an impedance
out of the expected grid specification and therefore won't AC couple with
them, but would like more solid info on that.<br><br>
Good Luck<br><br>
On Mon, Apr 4, 2016 at 6:45 PM, jay
<<a href="mailto:jay.peltz@gmail.com">jay.peltz@gmail.com</a>>
wrote:<br>
<dl>
<dd>HI Allan,<br><br>
<dd>The only reason to frequency shift is for “softer” charging.<br>
<dd>VRLA are not as sensitive to the pulse type charging that a relay
type charging would do. <br>
<dd>And regardless if you have frequency shift or not, you will still
need ( especially with VRLA) a high voltage relay.<br>
<dd>I recommend a SS relay, but a regular mechanical contactor will do as
well.<br><br>
<dd>jay<br><br>
<dd>Peltz Power.<br><br>
<br><br>
<blockquote type=cite class=cite cite="">
<dd>On Apr 4, 2016, at 12:34 PM, Allan Sindelar
<<a href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a>
> wrote:<br><br>
<dd>Wrenches,<br>
<dd>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>
<dd>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>
<dd>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>
<dd>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>
<dd>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>
<dd>Thank you,<br>
<dd>Allan<br>
<dd>-- <br>
<dd>Allan Sindelar</b><br>
<dd><a href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a>
<br>
<dd>NABCEP Certified PV Installation Professional<br>
<dd>NABCEP Certified Technical Sales Professional<br>
<dd>New Mexico EE98J Journeyman Electrician<br>
<dd>Founder (Retired), Positive Energy, Inc.<br>
<dd><a href="tel:505%20780-2738">505 780-2738</a> cell</b><br><br>
<dd> <br>
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