Back up generator sizing

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Stevenfyeager

Senior Member
Location
United States, Indiana
Occupation
electrical contractor
For a residence, my customer needs back up for 2 sump pumps (main reason for generator), 50 amp AC, plus 4 circuits;20 amp refrig and freezer and gas furnace, one lighting. He wants two different size choices ( one with and one without the 50 amp AC). He wants automatic transfer switch. What Watt generators would you recommend? Thank you.
 
Is that running current ?
What about FLA ?
Depending on the speed of the overload protection
I find you will need minimum 2 x running current
so 2 x 10A for two motors,=20a
X 2 for start surge = 40A. or 10Kva.

All up your looking at 25 to 30 Kva.
 
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