[OZAPRS] SOT : Lead Acid battery reconditioning

[Chris Hill]

Hi Damien,

The UPS can maintain full load (1300W) for just over an hour (when the
batteries are healthy, that is).

They were designed to keep a GSM cellular basestation going for 8 hours
with
no mains power.


Regards,



Chris



-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of Damien Gardner Jnr
Sent: Friday, 19 January 2007 6:58 AM
To: VK / ZL APRS Users
Subject: Re: [OZAPRS] SOT : Lead Acid battery reconditioning

----- Original Message ----- 
From: "Chris Hill" <chris.hill at crhtelnet.com.au>
> The UPS is a fairly large one (a 1300W unit made by On-Line Power, Inc.,
> similar to the unit at http://www.onlinepower.com/products/tbs.html),
1.3kW is tiny for a UPS, IMHO.. Though looking at the insane weight and
size

of it (my APC 1.5kVA under my desk is about the same size as a mini-tower 
PC, and comes in at ~10kg..), I'm guessing you're that particular UPS just
a

little under it's design grade ;)  I'm curious as to its run-time at full 
load??  I'm guessing somewhat more than 10-15 mins max a standard spec UPS

runs...

> with six 12V 50AH lead acid batteries.  The existing batteries are
> PRC-1250XL made by Power Battery Company, Inc, NJ, USA.  (A data sheet
for
> the series is available at
http://www.powerbattery.com/pdf/prc-1250s.pdf).
> It's going to cost approx $1300 to get a brand new set of batteries, so
it

WOW, 10 year life.. That's damned good for UPS batteries!  All of my APC 
UPS's (two 3kVA Rackmounts, a 1.5kVA standalone, and two 1kVA standalones)

get a max 2 years out of their SLA batteries.. - about $150 for new 
batteries for each of the 1kVA's, and $450 for a new kit for the 3kVA's.. 
When you average it out, $1300 over 10 years is pretty damned good, 
especially with its rated temperature range!

Althought if you don't actually need that temperature operation range, and

you're just running the one PC, then you might be better jumping on ebay
and

getting an APC Smart-UPS 1000 (should pick it up for max $200), and a new 
set of batteries ($150 max), and run that instead...  And if you want
longer

run-time, you can just put a couple of way smaller (cheaper) SLA's into
the 
UPS, and rig up a couple of deep cycle 12V batteries sitting on battery 
tenders, with a simple power-out switch-over circuit to switch the UPS
over 
to them in the event of a power outage.. (just make sure you find a 
make-before-break relay from somewhere ;) )

Regards,

Damien 


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