[Asterisk-Users] UPS rating for SOHO asterisk box

[Jean-Michel Hiver]

Daryl G. Jurbala wrote:

>>-----Original Message-----
>>From: asterisk-users-bounces at lists.digium.com 
>>[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of 
>>Jean-Michel Hiver
>>Sent: Tuesday, May 31, 2005 5:22 AM
>>To: Asterisk Users Mailing List - Non-Commercial Discussion
>>Subject: Re: [Asterisk-Users] UPS rating for SOHO asterisk box
>>
>>    
>>
>[...]
>  
>
>>Regarding this, I have done this hack yesterday:
>>
>>- Remove the battery from an existing UPS
>>- Rewire the UPS onto biggest car lead acid battery (12v) you 
>>can find.
>>
>>Et voila! Bigger capacity. Put the batteries in parrallel and 
>>you do get monstruous UPS capacity... the only trouble with 
>>it is that re-charging the batteries may take some time.
>>    
>>
>[...]
>
>Congratulations....you've just given this part-time small town fire
>marshal and 14-year fire service veteran nightmares.
>
>Kids....do NOT try this at home.  The inverters in small UPSes are not
>designed to deal with runtimes that exceed the batteries in them.  If
>you run this setup well past the time it was designed to run (by adding
>3, 4, or more times that battery capacity it was ever designed to have)
>that chances of a catastrophic inverter failure (meaning flash, boom,
>fire) are very real and very likely.
>  
>
Ouch...

In the test I have done, I replaced a HR 1224W F2F1 lead acid sealed 
battery by a fulmen heavy duty 95 amp/hours battery.

The UPS flattened the battery out after 70 minutes instead of the 
original 15 minutes. However, charging *is* slow: it's been now 36 hours 
and it's still charging.

Looks like I'll be better off buying a proper smart charger along with a 
decent inverter. I wouldn't want to fry the house :)

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