<font size=2 face="sans-serif">Hi:</font>
<br>
<br><font size=2 face="sans-serif">When we developed the AC coupling capability
of the XW's we of course looked at what happens when the AC coupled power
is larger than the XW power.</font>
<br>
<br><font size=2 face="sans-serif">As William points out as long as the
loads are larger than what the AC coupled inverter can supply, then there
is no problem. However, this only works if the loads are consistently
larger. A load such as a pump or heater will not meet this requirement
if it switches off as it cycles in normal operation.</font>
<br>
<br><font size=2 face="sans-serif">If a large load falls off during AC
coupling, then whatever power is being produced by the AC coupled inverter
above any used by remaining AC loads will within one AC cycle show up as
a charging current to the battery. Depending on the particulars,
this abrupt and immediate increase in charging current can cause an overload
shutdown of the inverter/charger.</font>
<br>
<br><font size=2 face="sans-serif">For this reason we do not support AC
coupling in systems which have a grid tie inverter with a power output
larger than the inverter charger.</font>
<br>
<br><font size=2 face="sans-serif">Having said that, engineering is currently
working on improvements to AC coupled charging operation, so the situation
may change.</font>
<br>
<br><font size=2 face="sans-serif">JARMO<br>
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<br>
<table width=100%>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">William Korthof <wkorthof@gmail.com></font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">To:</font>
<td><font size=1 face="sans-serif">RE-wrenches <re-wrenches@lists.re-wrenches.org>,
</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Date:</font>
<td><font size=1 face="sans-serif">09/14/2014 09:17 AM</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">Re: [RE-wrenches] Max AC coupling backfeed?</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Sent by:</font>
<td><font size=1 face="sans-serif">"RE-wrenches" <re-wrenches-bounces@lists.re-wrenches.org></font></table>
<br>
<hr noshade>
<br>
<br>
<br><font size=3>I've successfully operated isolated temporary installations
where the ac-coupled inverter output significantly exceeds the battery-backup
inverter nameplate rating. Obviously there has to be enough "firm"
AC load to absorb at least the portion of the AC coupled output that exceeds
the grid tie inverter capacity. </font>
<br>
<br><font size=3>Hypothetical example: </font>
<br><font size=3>(3) Power One 6 kW 240 output grid-tie inverters with
7.5 kW of PV modules each. </font>
<br><font size=3>(2) Schneider XW6048 battery backup inverters</font>
<br>
<br><font size=3>Suppose the supported AC load consisted of a mix of refrigeration
and other heavy loads with minimum demand during sunny hours of 6 kW. </font>
<br><font size=3>Or suppose the solar array consisted of modules on steep
45 degree East/West roof surfaces...</font>
<br><font size=3><br>
/wk</font>
<br>
<br><font size=3><br>
On Sep 14, 2014, at 8:55 AM, Tump <</font><a href=mailto:tump@swnl.net><font size=3 color=blue><u>tump@swnl.net</u></font></a><font size=3>>
wrote:<br>
</font>
<br><font size=3>All, I am wondering what the max AC Coupled back feed
into an OBGTVX 3648 might be. I have installed a 4.9 STC array into a SMA
TL5k inverter and the customer presently has an single OB GTVX with a T240
into a Eback up load panel. I would like to know if there are any limitations
in this type of configuration using an AC coupling situation to operate
during a grid failure.</font>
<br><font size=3>Thoughts please.</font>
<br>
<br><a href=blocked::mailto:Tump@swnl.net%22%20%5Co%20%22blocked::mailto:Tump@swnl.net><font size=1 color=blue face="Times New Roman"><b><u>Tump@swnl.net</u></b></font></a><font size=1 face="Times New Roman">
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