Northshore Generators · Electrical Load Calculator
Whole Home Generator Sizing Calculator
Three step planning tool for St. Tammany Parish: home square footage baseline, HVAC counts, and electric only major appliances. We add running watts plus the largest single motor surge.
Important — rough estimate only. This calculator is for general planning and is not a formal electrical load calculation, engineered sizing report, permit submission, or binding price quote. Actual loads and generator needs depend on your main panel, branch circuits, motor types, transfer switch layout, fuel type, and local codes—only a licensed professional can confirm sizing after an on-site evaluation. Cost ranges are illustrative ballparks and may change. For accurate sizing and a written proposal, call 985-239-5996.
Baseline Home Size
General lighting and receptacle load per NEC planning guidance: square footage × 3 watts.
Baseline load: 6,600 W
HVAC Load
Count each central air conditioner or heat pump condenser you need on backup power.
3 Ton AC Units
Standard Northshore single or dual zone systems
3,500 W running · 7,000 W starting each
5 Ton AC Units
Large homes, dual condensers, or high tonnage zones
5,000 W running · 10,000 W starting each
High Draw Appliances
Electric appliances only. Gas water heaters, dryers, ranges, and pool heaters draw negligible wattage for controls only. Leave these off if your equipment runs on natural gas or propane.
17,100 W rough estimate · 22kW Generac Guardian
Not a formal load calc—call for precise sizing and a written quote.