I have a 600VA UPS for computer only. It holds for
20minutes only.
1. Can it be upgraded for longer period.?
2. Can it be used for one ceiling fan and a tube light? If
yes, how to upgrade?
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Answer Posted / ehsan rabbi
u r telling that it holds for 20 mins. But in practice it
doesnt last more than 4/5 mins. does it ? Actually it
depends. A 600 VA UPS running from a typical 12 volts 7.5Ah
battery can handle 600 x 0.8(pf)x75%(eff)=360 watts of load
only. There are many other facts that im not breaking down
right now.
The fact is simply this. U can prolong your backup time by
adding higher ampere-hour battery like 12 volt 8Ah or
maximum 12 volt 12Ah but not more. If u want more backup
u'll need much higher AH rated battery (like 40Ah) and at
the same time u must upgrade your battery charger to a
higher level otherwise those heavy batteries will take
forever to charge fully /partially or whatever. Bottom line
is u just have to spend more bucks not only for battery but
also the built in circuitry mounted with the UPS.
Both the ceiling fan and tube lights(which includes
ballast)have raw power factors (0.6~0.75) That means an 80
watts fan can consume upto 115 watts of power. To drive
those loads u not only need high amps battery but also high
volt-ampere machine (eg. 1200 VA)
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