You can build a battery backup fairly simply.
just get a 12V - 110V (or whatever you need) power inverter in the wattage 
you need, connect lots of Deep-cycle marine batteries in parallel to the 
inverter. get a hefty, low noise, battery charger to charge all the 
batteries (as fast as you use the power). set up a 12V relay (with lots of 
power handling) so that the relay coil is directly powered by the charger 
and the switch (duel or single pole) connects/disconnects the batteries from 
the charger. it should be setup in such a way that when the charger no 
longer has power, it deactivates the relay and disconnects the batteries 
from the charger so that it does not discharge them. at least this is how 
the UPS I have works (just one battery at the moment).
Just a note, the charger should be an auto charger (automatically stops when 
the batteries are fully charged) so as not to over charge the batteries.

-Travis



>From: Angel Rodriguez 
>Reply-To: psn-l@..............
>To: Larry Cochrane 
>Subject: Re: Gas Generator recommendations
>Date: Mon, 7 May 2001 22:00:37 -0500
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>From larry_cochrane@.............. Mon May 07 20:11:42 2001
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>
>Hello Larry,
>
>I have a 1500 watt inverter / charger and 4 GC4 batteries which add up
>to 440 amp hours of power.  I can run 4 computers / hubs / radios and
>what not for about 15 - 20 hours depending on what's on.  It switches fast 
>enough when the power
>goes out that the computers don't notice.  (less than 30
>milliseconds).
>
>No noise at all
>
>angel
>
>
>Monday, May 07, 2001, 5:15:34 PM, you wrote:
>
>LC> Greetings,
>
>LC> With all of this talk about blackouts here in California I have been
>LC> thinking about getting a gas (propane?) generator. Can anyone recommend 
>a
>LC> small reliable unit that's not to noisy? I would think a 2500-3000 watt 
>unit
>LC> should be fine. I only want to power a couple of computers, monitors, 
>hubs,
>LC> DSL modems and maybe a few florescent lights. I don't need to power any
>LC> heavy equipment like my refrigerator.
>
>LC> Thanks,
>
>LC> -Larry Cochrane
>LC> Redwood City, PSN
>
>
>LC> __________________________________________________________
>
>LC> Public Seismic Network Mailing List (PSN-L)
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>
>
>
>--
>Best regards,
>
>Angel
>
>www.volcanbaru.com
>
>
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