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<div class=Section1>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Sell RE and
Refloat are not Temp Compensated, <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Absorb, Float
Voltages and EQ are temp Compensated. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Older Grid
tie inverters using firmware revision 75 utilized temperature compensated
voltage with the Sell RE, but new versions such as 76 and above don’t.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal>“2)What is the difference between refloat and rebulk?”<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>For the purpose of the GT units, it’s really the same.
Just when Refloat, is triggered it’s basically going into a Re-bulk
mode. <o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Steve Higgins. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Sr Application Engineer. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Sub-Saharan Africa Business Dev Mgr. </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:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Outback Power Systems. </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'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>19009 62nd Ave Ne </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:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>Arlington Wa 98223</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:10.0pt;font-family:"Arial","sans-serif";
color:#1F497D'>360-618-4313</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>
</div>
<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>R Ray
Walters<br>
<b>Sent:</b> Monday, April 05, 2010 12:13 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Fwd: Outback Grid Problems<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks very much Steve;<o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>I still have 2 questions: does the temp sensor control all
voltage set points or just absorption and float voltage?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>2) I'm still a little confused about the absorption time,
and refloat, rebulk features. for instance, what is the difference between
refloat and rebulk?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Apparently his system was getting stuck in a mode where it
couldn't quite satisfy the absorption time, and would cycle back and forth into
a refloat mode, etc. Is it possible that the temp sensor was causing the sell
voltage setting to drop below the refloat voltage? or that, as the temp of the
battery rose through the day, the set points kept changing and never quite get
met?<o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";
color:black'>R. Walters<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";
color:black'><a href="mailto:ray@solarray.com">ray@solarray.com</a><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";
color:black'>Solar Engineer<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";
color:black'><o:p> </o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";
color:black'><o:p> </o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";
color:black'><br>
<br>
</span><o:p></o:p></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<div>
<p class=MsoNormal>On Apr 5, 2010, at 11:02 AM, Steve Higgins wrote:<o:p></o:p></p>
</div>
<p class=MsoNormal><br>
<br>
<o:p></o:p></p>
<div>
<div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'>Here is a bit more on how
RE-BULK and RE-FLOAT interact with the ABSORB timer. All battery voltages are
default and are given as 12VDC nominal, multiply by 2 for 24V and 4 for 48V
systems. All of the following is true for grid-tie GV or GT FXs only.<span
class=apple-converted-space> </span><br>
<br>
<b><br>
</b>After the battery voltage reaches the Absorption set point, the absorption
timer starts counting down and maintains absorption voltage for the absorption
time. Watching the absorption time is the indication of how long the FX will be
in the absorption mode.<span class=apple-converted-space> </span><br>
<br>
After the absorption mode is finished, the next stage is Sell RE. Sell RE is a
target that the FX cannot charge too, but can export renewable energy if the
source is powerful enough. Towards the end of the day, typical renewable
energy, like solar, is not available so the FX cannot export any more power. In
this event the FX will go silent/passthru, which means it stops any power
conversion.<span class=apple-converted-space> </span><br>
<br>
The battery usually still has small DC loads, so battery voltage may slowly
fall during the night. If the battery voltage falls below the RE-FLOAT setpoint
(12.5 volts) then the FX will transition to the FLOAT stage and charge the
battery to the FLOAT target (13.6 volts) for the FLOAT time (1 hour). After the
FLOAT timer has expired, the FX returns to the SellRE stage and/or
silent/passthru.<span class=apple-converted-space> </span><br>
<br>
If the battery falls past the REFLOAT setpoint, below 12.4 volts (which we call
RE-BULK), the FX will change to the BULK stage and the absorption time
remaining will start counting up. The absorption time remaining will count up
in real time as long as the battery voltage is 12.4 volts or below. The
absorption time remaining counts in double time if the battery voltage is less
than 12.0 volts and counts in quadruple time if battery voltage is less than
11.6 volts. In other words the lower the battery voltage goes the more time the
system will have to remain in the absorption stage up to the absorption time
setpoint.<span class=apple-converted-space> </span><o:p></o:p></p>
</div>
</div>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
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