Below are examples approximating the power generator size based upon the loads shown. In many cases, generator manufacturers have designed their units to allow for short-term motor starting or overload conditions. Your generator size may vary depending on your specific loads and conditions, or whether the unit proposed is equipped with this feature.

Example #1

Quantity Equipment Description Estimated
Starting Wattage
1 1/3 HP Furnace (no air conditioning) 2,380W
1 1/2 HP Sump pump 3,600W
1 Refrigerator 2,500W
Emergency lighting total 2,000W
Starting wattage for these connected loads 10,480W
Recommended Generator Size = 8KW or 8,000 watts

Example #2

Quantity Equipment Description Estimated
Starting Wattage
1 1/3 HP Furnace (no air conditioning) 2,380W
1 1/2 HP Sump pump 3,600W
1 Refrigerator 2,500W
Emergency lighting total 2,000W
1 1/2 HP Ejector pump 3,600W
1 Freezer 2,500W
Starting wattage for these connected loads 16,580W
Recommended Generator Size = 10KW or 10,000 watts

Example #3

Quantity Equipment Description Estimated
Starting Wattage
1 1/3 HP Furnace (no air conditioning) 2,380W
1 1/2 HP Sump pump 3,600W
1 Refrigerator 2,500W
Emergency lighting total 2,000W
1 1/2 HP Ejector pump 3,600W
1 Freezer 2,500W
1 Coffee maker 1,200W
1 Microwave oven 2,250W
Additional general lighting 2,000W
Starting wattage for these connected loads 22,030W
Recommended Generator Size = 15KW or 15,000 watts