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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.<font size="2">
<br />
<br />Mick Abraham, Proprietor
<br />
<a target="_blank" href="http://www.abrahamsolar.com/">www.abrahamsolar.com</a>
<br />
Voice: 970-731-4675
<br />
<br /><b>---------- Original Message
-----------</b>
<br />
From: "robert ellison" <reellison@gmail.com>
<br />
To: wratterman@sunenergypower.com, RE-wrenches
<re-wrenches@lists.re-wrenches.org>
<br />
Sent: Tue, 30 Sep 2008 18:54:06 -0400
<br />
Subject: Re: [RE-wrenches] Charging with "no contact" systems
<br />
<br />>
Walt,
<br />> 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.
<br />>
<br />>
<br />> Just another wrenches
opinion,
<br />> Bob
<br />>
<br />> On Tue, Sep 30, 2008 at 10:57 AM, Walt Ratterman
<span dir="ltr"><<a href="mailto:wratterman@sunenergypower.com">wratterman@sunenergypower.com</a>></span>
wrote:
<br />>
<blockquote style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;" class="gmail_quote">
<br />>
<br />> Hello
all,
<br />>
<br />> 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.
<br />>
<br />> 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.)
<br />>
<br />> 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.
<br />>
<br />> 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).
<br />>
<br />> 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??
<br />>
<br />> 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.
<br />>
<br />>
Thanks,
<br />>
<br />>
Walt
<br />>
<br />> <b><span style="font-size: 10pt;">Walt
Ratterman</span></b>
<br />> <b><span style="font-size: 10pt;">SunEnergy Power
International</span></b><b><span style="font-size: 10pt;"></span></b>
<br />> <b><span style="font-size: 10pt;">
</span></b>
<br />> <span style="font-size: 8pt;">11 Laurel Lane South
Washougal, WA
98671</span>
<br />> <span style="font-size: 8pt;">(360)-837-3680 ▪
fax (360)-837-1315 ▪ Skype
Walt-Mobile</span>
<br />> <span style="font-size: 8pt;"><a target="_blank" href="mailto:wratterman@SunEPI.org"><span style="color: blue;">wratterman@SunEPI.org</span></a>
</span><span style="font-size: 10pt;"> </span><span style="font-size: 8pt;">▪ <a target="_blank" href="http://www.sunepi.org/"><span style="color: blue;">www.SunEPI.org</span></a></span>
<br />> <span style="font-size: 10pt;">
</span>
<br />> <span style="font-size: 8pt;">
</span>
<br />> <span style="font-size: 10pt;">
</span>
<br />>
<br />>
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</blockquote>
<br /><b>------- End of Original Message
-------</b>
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