Residential Electrical Service Load Matrix & Panel Sizing
Eliminate service capacity guesswork when installing EV chargers, cold-climate heat pumps, and solar battery storage. Select your square footage and appliance profile below to verify NEC 220.82 diversified demand loads, required service conductors, and conduit dimensions.
150A & 200A Standard Residential Service Upgrades
Single-family homes with central AC, Level 2 EV charging, and heat pump conversions
Adding a 40A Level 2 EVSE to 100A Service
Replacing Gas Heating with 3-Ton Heat Pump + 8kW Electric Backup
1,800 Sq Ft with Electric Range, Electric Dryer, Gas Heat
Standard All-Electric 2,000 Sq Ft Suburban Residence
2,500 Sq Ft Home with Central Air & Electric Cooking
3,000 Sq Ft Home with 4-Ton AC and Full Appliance Suite
2,200 Sq Ft All-Electric Home Adding 48A EVSE (60A Breaker)
Cold-Climate Heat Pump Conversion with Strip Heat Backup
2,400 Sq Ft Home with 50A Hot Tub and 35A Pool Heat Pump
Adding a 27 kW (112.5A) Electric Tankless Water Heater
Fully Decarbonized Home: Induction, Heat Pump, HPWH, EVSE
2,500 Sq Ft All-Electric with 40A EVSE and Inverter HVAC
Heavy Detached Workshop: 5HP Compressor, 240V Welder, 32A EVSE
Step-by-Step Transition Benchmark from 100A to 200A Service
100A Panel Baseline & Overload Risk Scenarios
Verification for small condos, legacy panels, and EV/heat pump overload assessments
Baseline Gas-Heated Cottage / Townhome
1,500 Sq Ft with Electric Range & Gas Heat
800 Sq Ft Standalone ADU Fed from Main House Service
300A / 400A Estates, Dual EV Fleets & Detached Outbuildings
Class 320 parallel service entrance sizing, detached workshops, and accessory dwelling units (ADU)
3,500 Sq Ft with Dual AC Systems, Hot Tub, and 48A EVSE
4,000 Sq Ft with Dual 3-Ton ACs, Pool Equipment, 2x EV Chargers
5,000 Sq Ft Luxury Residence with Multi-Zone HVAC & Heated Pool
Two 48A Tesla Chargers, Two Inverter Heat Pumps, Full Induction Suite
800 Sq Ft Standalone ADU Fed from Main House Service
Detached Woodworking Shop with 240V Tools & Dust Collection
Heavy Detached Workshop: 5HP Compressor, 240V Welder, 32A EVSE
All calculations adhere to NEC Article 220.82 (Optional Calculation for Dwelling Units). General lighting is calculated at 3 VA per square foot (NEC 220.82(B)(1)), small appliance and laundry circuits at 1,500 VA each (NEC 220.82(B)(2)), with the first 10,000 VA assessed at 100% and the remainder at 40%. Heating and air conditioning loads are evaluated per NEC 220.82(C) using the largest non-coincident load. Service entrance conductors follow NEC Table 310.12 (75°C temperature rating). Always consult your local Authority Having Jurisdiction (AHJ) for regional amendments.