Long-term (hours+) solution for power outage: PBX, lights, and computers

[Greg Rundlett]

You've probably already ruled this out b/c the building and office
layout, but maybe a fueled generator running outside would work.
Since there are local small UPSes, and people are onsite, there would
be time to get the generator setup.   Run some heavy duty extension
cords to the office window.

Solution cost < $3,000

This one is 450 lbs.  Runs for about 5-10 hours depending on load and
offers up to 15,000 watts

http://www.homedepot.com/prel80/HDUS/EN_US/diy_main/pg_diy.jsp?CNTTYPE=PROD_META&CNTKEY=misc%2fsearchResults.jsp&BV_SessionID=@@@@1789588186.1157201532@@@@&BV_EngineID=ccciaddikeljdmdcgelceffdfgidgim.0&MID=9876