How to ensure your generator can handle startup surges?

Generator Sizing for Startup Surges

When sizing a portable generator for a specific application, it’s crucial to consider the startup surges of connected appliances, in addition to their steady-state power requirements. This is because many appliances, such as refrigerators and air conditioners, draw a significant amount of power during startup, which can exceed their steady-state ratings. For example, a refrigerator may draw up to 2-3 times its steady-state power during startup. To account for these surges, you should add 25-50% to the total steady-state power rating of the connected appliances.

Transfer Switch Considerations

Using a suitable transfer switch is essential to manage the transition from grid to generator power and prevent damage to the generator or connected appliances. A transfer switch should be rated for the total power output of the generator and should be able to handle the startup surges of connected appliances. Look for a transfer switch that has a high surge current rating, typically in the range of 50-100 amps. Additionally, ensure that the transfer switch is compatible with your generator and connected appliances.

Generator Selection and Configuration

When selecting a generator, choose a unit with a sufficient power rating to handle the total startup surge of connected appliances. Consider a generator with a high surge current rating, typically in the range of 50-100 amps. Additionally, make sure the generator is properly configured for your application, including the use of a suitable transfer switch and overload protection.