Daryl G. Jurbala wrote:
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] 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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