The battery voltage level used in most of the small and medium power rated UPS will be of low value compared to the d.c voltage required to synthesize sine wave output of 230V r.m.s value by SPWM without using a level shifting transformer. The battery level is 12-24V up to 1kVA rating, in the 36-48V rating up to 3kVA and 120V for rating up to 10kVA.It is true that many manufacturers have started employing 360V battery even in the rating range of 500VA to 10kVA.But there are definite advantages in using as low a battery voltage as the current power semiconductor technology permits from the point of view of battery life and better reliability from UPS.more...
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