[mythtv-users] Power outages and UPSs

[DaveD]

According to the output of apcupsd status, below, I'm overdue for a 
battery replacement.  This system is only a 350 VAW and only gives me 5 
minutes.  I have it set to shut down the system after 30 seconds of no 
power.  And yes, I have to hit the PC's power button when the power 
comes back so our recordings will not happen if we're away from home and 
the power goes out for > 30 sec.  I think there are ways to reconfigure 
that, though.  This is a pretty smart little box.  It was $25 (plus tax) 
at a brick & mortar closeout a couple of years ago.  The last ones I 
bought were 500 VAW and were $30 each plus shipping.

 > service apcupsd status
APC      : 001,034,0854
DATE     : Sat Jul 28 09:39:06 PDT 2007
HOSTNAME : hal
RELEASE  : 3.12.4
VERSION  : 3.12.4 (19 August 2006) redhat
UPSNAME  : hal
CABLE    : USB Cable
MODEL    : Back-UPS ES 350
UPSMODE  : Stand Alone
STARTTIME: Thu Jul 26 01:08:02 PDT 2007
STATUS   : ONLINE
LINEV    : 117.0 Volts
LOADPCT  :  58.0 Percent Load Capacity
BCHARGE  : 100.0 Percent
TIMELEFT :   5.0 Minutes
MBATTCHG : 0 Percent
MINTIMEL : 0 Minutes
MAXTIME  : 30 Seconds
LOTRANS  : 091.0 Volts
HITRANS  : 130.0 Volts
ALARMDEL : Always
BATTV    : 13.6 Volts
LASTXFER : Automatic or explicit self test
NUMXFERS : 0
TONBATT  : 0 seconds
CUMONBATT: 0 seconds
XOFFBATT : N/A
STATFLAG : 0x07000008 Status Flag
MANDATE  : 2005-10-13
SERIALNO : AB0542246146 
BATTDATE : 2000-00-00
NOMBATTV :  12.0
FIRMWARE : 23.B1a.D USB FW:B1a
APCMODEL : Back-UPS ES 350
END APC  : Sat Jul 28 09:39:30 PDT 2007

DaveD

lionel dybowski wrote:
> I found a nice solution to UPS short life (mine only lasted 12 months 
> before it died completly)
> - mini itx MB
> - pico PSU from itx store (powered from 12VDC)
> - on board battery with a little bit of electronics to maintain battery 
> charge main supply
>
> The main problem with UPS is temperature. Battery life expectancy is 3 
> to 5 years at 20°C, but only one year above 25°C!! check battery 
> datasheets! PSU tend to get very hot.
> Moreover, it seems odd to convert mains to 12VDC for matteries, then 
> back to some forme of 240VAC, to get it back down to 12V and 5V with a 
> low efficiency computer power supply that generates noise and heat... 
> efficiency is pretty poor...
>
> lionel
>
>
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> John Drescher wrote:
>   
>>> And how long do the batteries tend to last before they need replacing
>>> again?  Seems like mine never go more than a year regardless of how
>>> often they get used (power here is pretty stable--except when I'm
>>> traveling, of course).
>>>
>>>     
>>>       
>> Mine last about 3 years. I never get APC batteries I get generic
>> batteries of the same size with a higher rating than the APC
>> batteries. BTW, the APC (12V 7.2AH) ones are the same type batteries
>> as the ones in the powercom King Pro UPSs.
>>
>> John
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>>     
>
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