Suppose you want 3 Fans, 3 Tube lights, 8 LED lights, 1 television & 1 refrigerator to operate at the time of power failure. The power consumed by these items will be total of the power consumed by these individually: (For Example Only)
1 Fan – 70 Watts
1 tube light – 40 watts
1 led light – 7 watts
1 led television – 70 watts
1 Refrigerator - 140 Watt
Therefore your total power requirement is (3*70 +3*40 +8* 7 + 1*70+ 1*140) = 596 watts
Find the VA rating of the inverter you need
VA stands for Volt ampere rating. It is the voltage and current supplied by the inverter to the equipment. Your appliances need more VA than the power requirement in Watts due to the nature of the devices. The ratio is called Power factor.
Hence Power supplied (or VA rating of inverter) = Power requirement (power consumed by equipment in watts) / Power factor.
Usually at homes, power factor ranges from 0.65 - 0.8, taking 0.7 for the calculations,
Power of inverter (VA) = 596/0.7 = 851 VA
So an inverter with 900 VA will be the right choice for your home
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