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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Wrenches –<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Just to clarify on this a bit… When we designed the XW we were
always assuming there would be some sort of voltage regulation on the input to
the batteries, either with a PV MPPT controller or a diversion regulator for
wind and uHydro systems. So hence while the unit does try to regulate the
battery voltage while selling power to the grid it does take some time when in
sell mode to make sure everything is stable and compliant with the UL1741
limits before actually starting to transfer power.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>With a typical set up this is just fine, but obviously with a wind
system like this the delay allows the voltage to rise to the point the inverter
thinks it has a lot of power to sell, and with smaller battery bank sizes
quickly pulls the voltage back down to the point it stops selling. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>As mentioned below we think we can speed this start of selling
to the grid when battery voltage rises past the Grid Support Voltage setting, which
should help smooth out this sort of situation. Initially we will test this in the
lab and at a few sites to ensure we get good performance, then will roll
the change into new units. This all may take longer than a few weeks, but we
will do our best!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Yours for a windy future…<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Mark<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Mark
Edmunds</span><span style='color:#1F497D'><br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Director Engineering</span><span style='color:#1F497D'> <br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Residential Renewable Energy Markets</span><span
style='color:#1F497D'> <br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Xantrex Technology Inc.</span><span style='color:#1F497D'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>p. 604.422.2609</span><span style='font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D'> <br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>f. 604.420.1591</span><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'> <br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>E-mail: mark.edmunds@xantrex.com</span><span style='font-size:
11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> <br>
</span><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Website:</span><u><span lang=EN-CA style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'> </span></u><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a
href="http://www.xantrex.com"><span lang=EN-CA style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:blue'>www.xantrex.com</span></a> <br>
<br>
</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Michael
Welch<br>
<b>Sent:</b> Friday, January 16, 2009 1:46 PM<br>
<b>To:</b> re-wrenches@lists.re-wrenches.org<br>
<b>Subject:</b> [RE-wrenches] XW / Wind problem to be fixed by firmware update<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi gang. Please contact me OFF LIST if you have any
questions.<br>
<br>
Dan Lennox asked me to post this to the list:<br>
<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>I have been working with Xantrex customer support for the
last couple of months, concerning an issue when a XW-6048 inverter is connected
to a wind turbine and allows alarmingly high battery voltage.<br>
<br>
The inverter Grid Support Volts is set to 55v, and should sell at or around
this voltage. However I have seen issues where the inverter is not selling and
allows the battery voltage to get alarmingly high (>60v). It would have gone
higher (and I have seen 63v) except that my diversion controller kicks in and
diverts power, stopping the voltage increase.<br>
<br>
This situation occurs typically under low wind conditions and it seemed to take
about 15 seconds for the inverter to wake up and load the wind turbine.
When the inverter did 'kick in' it put a 60amp load onto the turbine, which
caused it to slow down, quickly lowering the battery voltage and the
inverter stops selling - causing the whole cycle to happen over again!<br>
<br>
I just heard from an Xantrex customer support engineer that the XW inverter
software has a built in 20 second delay (de-bouncing time they called it) once
the Grid Support Voltage is reached, regardless of how high the voltage may
get.<br>
<br>
Xantrex has agreed to work on a firmware upgrade that will allow SELL to occur
when BATTV=GSV+4V and this should be available in a few weeks.<br>
<br>
Dan Lenox<o:p></o:p></p>
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