This ATS calculator ensures compliant sizing beyond simple residential needs.Unlock accurate Automatic Transfer Switch (ATS) sizing for your generator system. While small setups can estimate ATS capacity by matching load and generator ratings, larger installations demand precise calculation to ensure safety, reliability, and efficiency. This smart tool helps you determine the ideal ATS rating with built-in safety margin—perfect for homes, businesses, and industrial power systems.
đź’ˇ Automatic Transfer Switch (ATS) Sizing Tool
Determine the right ATS capacity for your generator setup. The calculation is based on the maximum current source, plus a safety margin.
đź’ˇ Sizing Principle
The ATS must be rated for the **largest continuous current** between the Generator's full output (FLA) and the Utility's Main Breaker rating.
Required ATS Sizing (Amps)
*This is a theoretical minimum rating. Always consult local electrical codes and the ATS manufacturer for the final selection.