[EVDL List]

Mark,

How frequently are you cycling your UPS?
I do not understand why you are concerned about the time
it take for UPS batteries to get full and the main issue
with many UPS'es is that their float voltage is too high
for the battery temp and they cook the batteries to an
early death. I would never think of increasing a float
voltage much above 13.6V and at elevated temps (like inside
a UPS case) the 13.5V sounds about right, there is little
to gain, even for a Lead-acid, when floated higher, but
there is a lot to lose.
I keep my standby battery floated on a power supply set for
13.5V

Regards,

Cor van de Water
Chief Scientist
Proxim Wireless Corporation http://www.proxim.com
Email: xxx@xxx.xxx Private: http://www.cvandewater.com
Skype: cor_van_de_water XoIP: +31877841130
Tel: +1 408 383 7626 Tel: +91 (040)23117400 x203 =


-----Original Message-----
From: xxx@xxx.xxx.edu [mailto:xxx@xxx.xxx.edu] On Behal=
f Of Mark Hanson
Sent: Friday, June 29, 2012 7:03 AM
To: xxx@xxx.xxx.edu
Subject: [EVDL] FW: A123 ALM12V7 Battery internal electronics drop-out; now=
OK, A123 needs to note this on batts

[top]

Hi,

After charging overnight per the A123 manual and holding at 14.4V with a be=
nch supply, the batteries now appear to be OK. I ran a UPS cycle loaded at=
1A 230V (230W) and it ran through the 5 minute discharge OK with the batte=
ries dropping from 14 to 12.5V. The QUINT-UPS by Phoenix Contact has a des=
ign issue though, it only charges the LiFePO4 batteries to 13.5V per batter=
y (27V total), when according to the A123 ALM12V7 manual float charge shoul=
d be 13.8V per (27.6V total) and hold for 14.4V for 4 hours or 28.8V. It d=
oes not do that so I'll check with Phoenix Contact and see if they know any=
thing otherwise I'll have to modify the circuitry. The float voltage is ev=
en a bit too low to get a full SOC on the lead acid batteries I bought (the=
y like 27.6V float, 27V gets them about =BE charged and takes a longer time=
to get there, about 8 hours instead of 1 hour.)

[top]

mark www.REEVA.info

=

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