How do I use the Generator Load Shedding & Automatic Transfer Switch (ATS) Sizer?

Enter your specific project or financial parameters into the input fields above. The engine recalculates outputs dynamically in real time and updates visual charts and summary metrics.

Can I export and share these results?

Yes, you can generate shareable state links, export clean CSV spreadsheets, or print high-resolution executive reports with a single click.

Is this calculator free to use?

Yes, all calculation engines on ToolsVault are 100% free with no account registration or paywall required.

NEC Electrical Engineering

Generator Load Shedding & ATS Sizing Calculator

Calculate how smart load management modules (SMM / LSM) prevent generator overload, reduce required standby kW capacity by up to 40%, and meet NEC Article 702 compliance.

Major Heavy Appliance Loads

Central AC Compressor 4-Ton (4,500W Running / 16,000W Surge) Electric Water Heater 50-Gal (4,500W Running) Electric Range / Oven (8,000W Peak) Level 2 EV Charger (7,200W Continuous)

Base Critical Lighting & Fridge Load (Watts)

Generator Sizing Comparison

Traditional Full-Size Generator

Without Smart Load Shedding

24 kW Standby

Sized With Smart Load Shedding Modules

Staggered priority lockouts (NEC 702)

14 kW Standby

Capital Equipment & Fuel Savings

Generator upfront cost + 30% fuel cut

$3,200 Saved

Load shed modules monitor generator frequency (Hz). If frequency dips below 58 Hz, modules instantly drop heavy resistive loads to protect sensitive home electronics.

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