100A Panel EV Charger & Heat Pump Load Calculator (NEC 220.83)

Find out whether your existing 100A or 125A service passes inspection or how a $599 NEC 625.42 EVEMS load controller avoids a $3,500 200A panel upgrade.

NEC 2026 Article 220.83 & 625.42 Tool

100A Electrical Panel EV Charger & Heat Pump Load Calculator

Avoid $3,500 Panel Upgrade

Main Panel Rating (Amps)

Home Floor Area (Sq Ft)

Electric Range / Oven (Watts)

Electric Dryer + Water Heater (W)

Central AC / Heat Pump (Watts)

EV Charger Continuous Amps

Enable NEC 625.42 Smart Load Management (EVEMS / Emporia Vue / DCC-12)

NEC 220.83 Load Calculation Result

Calculating NEC 220.83 load...

Calculated Peak Demand

121.4 A

Cost Saved with EVEMS

$3,200

Engineering Rule: Under NEC 220.83, the first 8 kVA of general load counts at 100%, remainder at 40%, plus 100% HVAC and 125% EV continuous load. Adding a listed NEC 625.42 EVEMS ($599) throttles charging during peak stove/AC use so your 100A panel passes inspection without a $3,500 200A service upgrade.

Get UL-Listed Emporia 48A + Vue EVEMS Load Manager ($599) →

Emporia $599

Emporia Level 2 EV Charger (48A) + Vue Smart Home Load Management Bundle (NEC 625.42)

✓UL-listed NEC 625.42 Energy Management System
✓Real-time CT clamps throttle EV charging when stove/AC runs
✓Saves $2,500–$4,000 by avoiding 100A to 200A panel upgrade

Check Price & Specs at Emporia →

Lectron $379

Lectron V-Box Pro 48A Level 2 EV Charging Station (Configurable Amp Limit)

✓Hardware rotary switch to lock 16A / 24A / 32A / 40A / 48A per NEC
✓J1772 & NACS (Tesla) options
✓Wi-Fi off-peak scheduling

Check Price & Specs at Lectron →

DCC / Thermolec $749

DCC-12 / Smart Panel EV Energy Management System (Hardwired 100A Panel Saver)

✓Works with ANY EV charger (Tesla Wall Connector, ChargePoint, etc.)
✓Cuts power only when main 100A panel exceeds 80% load
✓Inspector-approved zero-load calculation under NEC 220.83 & 625.42

Check Price & Specs at DCC / Thermolec →

State & Vehicle Specific 100A Panel Calculators

Main Panel Rating	100A
Home Floor Area	1850 sq ft
General Lighting (3 VA/sq ft)	5550 VA
Small Appliance + Laundry (NEC 220.52)	4,500 VA (fixed: 2×1500 SA + 1500 laundry)
Electric Range / Oven (NEC 220.55)	10000 W
Electric Dryer + Water Heater	9500 W
Total General Load (before demand)	29550 VA
NEC 220.83 Demand: First 8kVA @ 100%	8,000 VA
NEC 220.83 Demand: Remainder @ 40%	8620 VA
Central AC / Heat Pump (@ 100%)	5000 W
EV Charger Continuous Load (@ 125%)	14400 W
EVEMS NEC 625.42 Load Management	No
TOTAL CALCULATED DEMAND	121.4 A
VERDICT	PASS / FAIL