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<p class=MsoNormal>Hello all,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>We have an application in Haiti (and some African countries
as well) where we have inverter /battery systems on a lousy (very lousy) grids.
The grid is good enough to charge batteries, but not sufficient for sensitive
electronic loads.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Therefore, the systems we are using are three Outback FX
3648 inverters. If they are connected with AC IN from the grid and the grid is
on and is lousy (but good enough to get through the voltage and frequency
limits), then this power will be passed on to the computers. (The reality is
that we have to open the voltage window too wide to let the grid in at all, and
thus unacceptable to the electronics.) So, we DO NOT connect the AC IN to the
inverters. In other words, the FX units become inverters only, and never pass
AC current from the grid to the loads. (This is what we are calling “no
contact” system – similar to a double conversion UPS system.)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>So – we need to add separate battery charging to the battery
bank that will put in roughly equal amphours to what we feel the daily usage
will be during the day.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The load is about 8000 watts, which might translate to 140
to 170 amps of discharging. We might not have to put in the full amount of
charge, since our charging can continue in the night hours when the load is not
discharging, but we should probably try to charge the batteries at around 100
to 140 Amps DC (48V).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Does anyone have a recommendation as to the type of charger
that might work best for this, either bulk, or smart, or a combination? OR……other
suggestions for this system that I am just missing??<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>We would plan to monitor this system by using the FlexNET DC
system, adding a DC shunt on the negatives of the feed going from the charger
TO the batteries.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Walt<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Walt
Ratterman<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>SunEnergy
Power International</span></b><b><span style='font-size:10.0pt;font-family:
"Times New Roman","serif"'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></b></p>
<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial","sans-serif"'>11
Laurel Lane South Washougal, WA 98671<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial","sans-serif"'>(360)-837-3680
▪ fax (360)-837-1315 ▪ Skype Walt-Mobile<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial","sans-serif"'><a
href="mailto:wratterman@SunEPI.org"><span style='color:blue'>wratterman@SunEPI.org</span></a>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><span
style='font-size:8.0pt;font-family:"Arial","sans-serif"'>▪ <a
href="http://www.sunepi.org/"><span style='color:blue'>www.SunEPI.org</span></a><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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