What will be the backup time of a UPS if it is backed by 150 Ah, 12 V battery driving a load of 150 W?

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 1
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  1. 14 h
  2. 10 h
  3. 16 h
  4. 12 h

Answer (Detailed Solution Below)

Option 4 : 12 h
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Detailed Solution

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Concept:

Load Power = 150 watts

Rating of battery used in UPS = 12 Volts, 150 Ah

The energy supplied by battery = Voltage x Ah

Energy supplied by battery = 12 × 150 = 1800 watt-hour

∴ A battery can supply energy of 1800 watt-hour

Backup time = (Energy supplied by the battery)/(Load Power)

Backup time \(=\frac{1800}{150}=12~h\)

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