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Electric Generators Direct created an interactive sizing wizard to automatically size your essential circuit generator depending on the number and type of appliances you need to power. Simply fill in the blanks with the appropriate information and the sizing calculator will tell you what size generator you should purchase.

Essential Circuit Sizing Guide

How to Size a Home Standby Generator

By
Product Expert
Electric Generators Direct
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Essential Circuit Sizing Guide

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 don’t exactly match, your electrician can always swap larger circuits with smaller circuits, but not vice versa.



None
15-Amp 120V

None
15-Amp 120V

None
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


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.

Essential Circuit Sizing Guide - Find out How to Size a Home Standby Generator. Electric Generators Direct has expert advice about How to Pick the Perfect Essential Circuit Generator, How to Pick the Perfect Home Standby Generator, and How to Pick the Perfect Smart Circuit Generator. Our generator how-to library can help you pick the perfect generator, transfer switch or generator accessory.