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November 23rd 05, 10:40 AM posted to sci.electronics.design,rec.crafts.metalworking,rec.radio.amateur.homebrew,sci.engr.joining.welding

Pete C.

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Uses for Old UPSes

wrote:

On Tue, 22 Nov 2005 12:55:29 -0800, "Bob Headrick"
wrote:

"Highland Ham" wrote in message
.. .

Bob , Interesting info ; can you confirm that the 18 pcs 12V battery were
in fact 9 strings of 2 batts in series (each string having a fuse )
providing 24 V ? or were all the 18 batts in parallel ?

Actually they were all in series, making it a bit nerve-wracking to replace a
battery in the string.

- Bob W7OV

216 volt battery pack??? I don't think so.

Not very common on a unit as small as 2kW, but very common on units in
the double digit kw range. If he meant 20kW instead of 2kW, it almost
certainly had a high voltage battery string. Much more efficient to have
the higher voltage at much lower current to convert to the high voltage
AC. On a 20kW unit that would put your battery current in the 85A range
for a 2xxV battery string vs. 850A range for a 24V battery string.

Pete C.

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