<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>Hi all</DIV>
<DIV>I have charged 72 volts on a golf cart type deal, with 2 each morningstar T60 and with 2 each MX 60s But Appolo may work or Classic </DIV>
<DIV>the trick is only use the charging function do not connect any communication cables Grounding is the problem. as one of the controllers is floating. with its negative terminal at 36 volts. The array has to be set up bipolar. The MX 60 was done with help from the old Outback Crew, back when Chris and Bob were there. I do not know who you would speak to now. With Morning Star you have to have the meter for the t-60 to set it up for 36 volts again check with MorningStar, I can not give you a name. I only now work with Brad </DIV>
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<DIV>Connect a center tap to the batteries 36 volts connect negative of one controller to negative of array, connect Positive to 36 volt point of batery. connect second controller negative to 36 point of battery and positive to 72 volt point. </DIV>
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<DIV>Also the MX 60 may have changed. the Tri60 may have changed. </DIV>
<DIV>Darryl<BR></DIV>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Mick Abraham <mick@abrahamsolar.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> RE-wrenches <re-wrenches@lists.re-wrenches.org><BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tue, February 8, 2011 10:06:02 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [RE-wrenches] questions about solar charging 72v UPS<BR></FONT><BR>Hi, Ron~<BR><BR>The Midnite Classic PV controller shows 72 volt nominal as one of the battery choices on its menu screen. That's about the only option I know of. Even though the HV controller from Apollo can accept a similar range of PV input voltage I think that unit stops at a 48v battery--maybe because of code problems with battery strings above 50 volts. <BR><BR>For charging a 72 volt lead battery, consider a minimum of 36 X 6 = 216 PV cells in each charging string. Confirm that "cell count" suggestion with someone who knows more than I
do about the Midnite controllers...such as boB Gudgel who is a frequent List contributor. I just unboxed my first Classic controller and I look forward to learning more about this item.<BR><BR>With a 72 volt lead acid battery bank it will be difficult to maintain equal state of charge on the 36 chemical cells in each battery string. As you know, Ron, one can only add/remove energy through the whole battery string--barring new developments--so if some of those critters get out of line it will be tough to re-establish good discipline. <BR><BR>Jolliness,<BR><BR clear=all>Mick Abraham, Proprietor<BR><A href="http://www.abrahamsolar.com/" rel=nofollow target=_blank>www.abrahamsolar.com</A><BR><BR>Voice: 970-731-4675<BR><BR><BR>
<DIV class=gmail_quote>On Tue, Feb 8, 2011 at 8:07 PM, Ron Young <SPAN dir=ltr><<A href="mailto:solareagle@solareagle.com" rel=nofollow target=_blank ymailto="mailto:solareagle@solareagle.com">solareagle@solareagle.com</A>></SPAN> wrote:<BR>
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<DIV style="WORD-WRAP: break-word">Hi All,
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<DIV>I recently acquired some UPS units that are a high end portable units (GE GT3000). They are nearly new and I would like to rig them up as a standalone emergency back-up power source with a solar (or wind) charging option. These units have sine wave output and are a double conversion type, i.e. power out is isolated from power in by ac to dc to ac conversion. The main problem I have is that the battery pack is 72v. It is expandable and I can add up to four additional packs to increase the runtime to over three hours at half power (1200 watts). How do I charge this type of battery pack with solar? Is there a charge controller out there that will provide nominal 72v? </DIV>http://www.gedigitalenergy.com/PowerQuality/catalog/gtseries.htm<BR><BR>
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<DIV style="MARGIN: 0px"><FONT size=3 face=Helvetica>Best Regards,</FONT></DIV>
<DIV style="MARGIN: 0px"><FONT size=+0><FONT size=4 face="'Garamond Premier Pro'"><SPAN><B><I><SPAN>Ron Young</SPAN></I></B></SPAN></FONT></FONT></DIV>
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