The Logic Within
We don't guess. We calculate based on the National Electrical Code (NEC) Article 220. Here is how the algorithm works.
General Lighting & Receptacles
The NEC requires 3 VA (Watts) per square foot for general lighting. Plus, we add strictly defined circuits for kitchens and laundry.
The "Demand Factor" Magic
You don't turn on every light at once. The code allows us to discount the total load to reflect reality.
Why 100 Amp Service Often Fails
In the past, homes had gas stoves, gas dryers, and no EV chargers. A 100 Amp panel provided about 24,000 Watts of power, which was plenty.
Today, a single Level 2 EV Charger can draw 40-50 Amps continuously. Add an electric Heat Pump (30-60 Amps) and an Induction Range (40-50 Amps), and you are mathematically guaranteed to overload a 100A panel during peak usage.
Our calculator identifies these bottlenecks before you fail an inspection.