Quick Answer
Starting watts are crucial for generator selection as they determine the unit's ability to initiate and sustain loads, particularly during startup, when appliances demand a significant surge of power.
Understanding Peak and Running Watts
When selecting a portable generator, it’s essential to differentiate between starting watts (also known as surge watts) and running watts. Starting watts represent the maximum power a generator can produce for a brief period, usually 10 seconds, to overcome the startup resistance of appliances. In contrast, running watts denote the continuous power output required to maintain the appliance’s operation. For example, a refrigerator might require 500 starting watts to start but only 250 running watts to maintain its operation.
Calculating Starting Watts for Your Load
To ensure proper generator selection, calculate the starting watts for each appliance connected to the generator. A common rule of thumb is to add 20-50% to the running wattage of each appliance to account for startup surges. For instance, a 200-watt appliance might require 240-300 watts of starting power. Multiply the starting watts of each appliance by the total number of appliances to determine the total starting watts required.
Choosing the Right Generator Capacity
When selecting a portable generator, consider the total starting watts required for all appliances. A general guideline is to choose a generator with a capacity of 125-150% of the total starting watts. This margin ensures the generator can handle startup surges without overloading or stalling. For example, if you have a total starting wattage of 1,500 watts, select a generator with a capacity of 1,875-1,875 watts (1,500 x 1.25) to ensure reliable operation.
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