couldnt help but saying.
look at this
!!!UPS Modding!!! + >>>Increase Backup time Manyfold<<< I have done it....
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For this post:
Well u have two options ..
1. get a Online UPS which has atleast one 180AH battry. should provde atleast 3 hrs backup to one decent PC.
2. Get a Signwave inverter. Atleast 800w fro one PC, reason for higher power rateing. look here
Use of UPS vs Inverter) and add it before Ur pc. again u will need atleast a 180AH battry for >3hr backup.
btw inverts are not bad for PC as per the usual misconception read the above link. UPS = Inverter + AVR(Automatic voltage regulator)
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Either way 5k is not enough for ur power requirement.
Microtech 800va Signwave inverter - 5000+
Exide Xtra performace 180AH battery - 6000+
Local inverter battry (double the headache + half the power) - 2500+
Online UPS with Battry - i donno but i guess - 8000+
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so the only way to stay in the budget is to do what I did. Mod ur UPS. Takes a lot of heart and guts