免费发电机选型计算器
根据电气负荷需求选择合适功率的发电机。
W
W
x
Minimum Generator Size
9.0 kW
Running Load5.0 kW
Starting Surge4.0 kW
Minimum Generator Size vs Total Running Watts
公式
## Generator Sizing **Minimum kW = Running Watts + Starting Surge** Motors (AC units, pumps, refrigerators) draw 2 to 6 times their running watts during startup. Add the surplus starting watts of the largest motor to the total running watts of everything else.
计算示例
5,000W running load, largest motor is 2,000W with 3x starting surge.
- 01Running = 5,000W
- 02Surge = 2,000 x 3 - 2,000 = 4,000W extra
- 03Total = 5,000 + 4,000 = 9,000W = 9.0 kW
- 04Select a 10 kW generator.
常见问题
What appliances have the highest starting surge?
Central AC units (3-5x), well pumps (3-5x), and sump pumps (2-3x) have the highest starting surges. Resistive loads like heaters and lights have no surge.
Should I size for the whole house?
A whole-house generator typically needs 15-25 kW. For a portable backup, prioritize essential circuits (fridge, sump pump, furnace, lights) and size accordingly.
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