Walt, Probably about the best bet is another set of inverters just as chargers. Look at the Magnu 4448AE inverters, they have a great charger that draws less incoming ac that any of the other chargers that I have tried. Seems that 2 of the 4448 inverters will each put about 60 amps DC into a battery bank with only 17 amps in @ 240 volts or 34 amps ac @ 120 volts.
Just another wrenches opinion, Bob On Tue, Sep 30, 2008 at 10:57 AM, Walt Ratterman < [EMAIL PROTECTED]> wrote: > Hello all, > > > > 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. > > > > 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.) > > > > 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. > > > > 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). > > > > 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?? > > > > 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. > > > > Thanks, > > > > Walt > > > > *Walt Ratterman* > > *SunEnergy Power International*** > > * * > > 11 Laurel Lane South Washougal, WA 98671 > > (360)-837-3680 ▪ fax (360)-837-1315 ▪ Skype Walt-Mobile > > [EMAIL PROTECTED] ▪ www.SunEPI.org <http://www.sunepi.org/> > > > > > > > > > > > __________ Information from ESET NOD32 Antivirus, version of virus > signature database 3483 (20080930) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > >
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