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Essential Circuit Sizing Guide

How to Size a Home Standby Generator

By 
 | 
Generator Product Expert

Put down the calculator! Sizing an essential circuit standby generator is extremely easy.

Simply input the number and size of the essential circuits you want to power during an outage. Our interactive sizing wizard will calculate the rest.

If your circuits donít exactly match, your electrician can always swap larger circuits with smaller circuits, but not vice versa.



None
15-Amp 120V

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15-Amp 120V

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15-Amp 120V

None
15-Amp 120V

None
15-Amp 120V

None
15-Amp 120V
20-Amp 120V

None
30-Amp 240V
40-Amp 240V

None
15-Amp 120V
20-Amp 120V

None
15-Amp 120V
20-Amp 120V

None
15-Amp 120V
20-Amp 120V

None
15-Amp 120V
20-Amp 120V

None
20-Amp 240V

None
40-Amp 240V
50-Amp 240V

Size My Generator

This calculator is intended for estimating purposes only. Actual power requirements of high demand appliances vary widely by brand, model and capacity. Always have a qualified electrician analyze your specific requirements before making a purchase decision.

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