NEC 220 Load Calculator — Solar + EV Demand Factors (Excel + Google Sheets)
$19.00
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NEC 220 Load Calculator — Solar + EV Demand Factors (Excel + Google Sheets)
$19.00
Tier 1 hero · NEC 2026 compliant
FAQ
Run a full 220.82 load calc on your phone in the driveway.
The 220.82 Optional Method with EV (625.42) and PV (705.12(B)(3)) factors built in. Output is permit-ready: every cell cites its NEC section. Enter inputs in yellow cells, the rest of the workbook recalculates live.
Excel + Google SheetsNEC 2026Mobile readyAHJ submittal output
What's inside
- 7 worksheets: Instructions, Inputs, NEC 220.82 Load Calc, NEC 625.42 EV Load, NEC 705.12 Solar Check, Permit Summary, Code References
- Real formulas, not a template. Change one input, the entire workbook recalculates.
- Pre-loaded demand factors for residential 200A and 400A services
- EV charger continuous-load multiplier built in for Level 2 EVSE (32A to 80A)
- Solar 120% busbar check for grid-tied PV plus existing service
- Permit Summary tab formatted for AHJ submittal with code citations
Who this is for
- Licensed electricians doing service upgrades for PV plus EVSE installs
- Solar installers prequalifying residential interconnect requests
- HVAC contractors adding heat pumps to existing services and needing a demand check
Who this isn't for
- Commercial 3-phase services over 400A (use NEC 220.84 Standard Method or ETAP)
- Anyone needing stamped engineering drawings (this is a calc, not a stamped design)
How it stacks up
Graph paperFree. Works. Most AHJs prefer a typed summary.
Mike HoltExcellent for learning. Worksheets don't auto-calc.
ETAPIndustry-leading. Costs thousands. Overkill for residential.
This$19 one time. Works in Sheets app on iPhone in 8 minutes.
FAQ
Will AHJs accept the Permit Summary tab?
The Summary tab is formatted with required fields (load calc, demand factor, NEC citation, calculated continuous load) the way most AHJs in the US expect to see them. Some jurisdictions still require a stamp from a licensed PE for service upgrades; check your local rules.
Updated for NEC 2026?
Yes. 220.82, 625.42, and 705.12(B)(3) reflect the 2026 edition. Includes both 2023 and 2026 reference tabs.
Does it work on iPhone?
Yes. Google Sheets app on iOS and Android both render the workbook correctly. Excel mobile too. Tap the yellow cells, type your input, the workbook recalculates.
Pairs With
NEC 2026 Residential Update Kit — $49
You have the load calc covered. The 2026 NEC also expanded AFCI to all branch circuits and GFCI to indoor sinks, outdoor 60A outlets, and outdoor HVAC (Sept 1, 2026). Bid templates, room-by-room checklists, customer disclosure letter.
View NEC 2026 Residential Update Kit →
Disclaimer · Code calculator
This calculator is a research utility, not stamped engineering. It does not generate a permit, certification, or stamped one-line diagram. Service upgrades and commercial work may require licensed Professional Engineer review depending on your AHJ. Verify every code citation and AHJ submission requirement before filing. Not legal or engineering advice. Full disclaimer.
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