Mick and Bob,
Thanks for the input. And…just for the record, Haiti although international happens to have the same electricity characteristics as the US – 120/208 60Hz….. That part makes things easier, although it is tough for me to get used to going back to such big wire….. Thanks!! Walt -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of mick abraham Sent: Tuesday, September 30, 2008 4:06 PM To: RE-wrenches Subject: Re: [RE-wrenches] Charging with "no contact" systems The Magnum inverter number that Bob recommended would not work for international style AC input power, would it? If not for that, the Magnum inverter/charger does seem like a good way to get a lot of battery charger value for the money. Magnum does show some international style inverter/chargers, but not for a 48 volt battery. Mick Abraham, Proprietor www.abrahamsolar.com <http://www.abrahamsolar.com/> Voice: 970-731-4675 ---------- Original Message ----------- From: "robert ellison" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED], RE-wrenches <[email protected]> Sent: Tue, 30 Sep 2008 18:54:06 -0400 Subject: Re: [RE-wrenches] Charging with "no contact" systems > 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 <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 <http://www.members.re-wrenches.org/> > > ------- End of Original Message ------- __________ Information from ESET NOD32 Antivirus, version of virus signature database 3484 (20080930) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
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