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Thank you Amit. Your reply helped me to discover that UPS mode is 180v-260v. Could you also kindly let me know the backup duration for 900va & 150ah battery if my usage is 500watts per hour.

Hi Kishore, I just got a Microtek 900va Inverter and a 150ah tubular battery. During power cuts though the CFL bulbs lit and there was no indication of low battery, the inverter couldn't support my PC's Numeric 600va UPS. I also needed to know whether I should set the maximum charging voltage...