About ChargeTier
ChargeTier is an independent technical reference and calculation resource covering Level 2 electric vehicle supply equipment (EVSE), residential branch-circuit sizing, and generator panel interlock compatibility.
Our Purpose & Scope
Selecting a residential Level 2 EV charger or portable generator inlet involves cross-referencing multiple technical constraints: your vehicle's onboard AC charger limit (kW), National Electrical Code (NEC) continuous-load sizing rules, conductor temperature ratings, voltage drop over long conduit runs, and breaker panel compatibility.
ChargeTier organizes published manufacturer specification sheets, NEC code references (including NEC Article 625, Article 702, Section 334.80, Section 110.14(C), and Table 310.16), and EPA vehicle consumption figures into structured calculators and side-by-side reference tables so homeowners can prepare informed questions before consulting a licensed electrician.
Primary Data Sources
- 📜 National Electrical Code (NFPA 70):Branch-circuit sizing formulas reference NEC Section 625.41 (125% continuous load factor), Table 310.16 (conductor ampacities at 60°C and 75°C), Section 334.80 (NM-B cable temperature limits), and Article 702 / 408.36(D) (optional standby interlocks and backfed breaker hold-down retainers).
- 🔌 Manufacturer Datasheets & Manuals:Charger amperage limits, connector types (SAE J1772 / SAE J3400 NACS), NEMA enclosure ratings, and commissioning options are compiled from official manufacturer specification sheets and installation manuals.
- 🚗 Vehicle Onboard AC Acceptance:Usable battery capacities (kWh), maximum Level 2 AC acceptance rates (kW), and combined efficiency ratings (mi/kWh) are compiled from automaker technical specifications and EPA fuel-economy data.
- 💲 Approximate Reference Pricing:Hardware prices displayed across our comparison tables are approximate reference prices from public retail listings and may change at any time. Always verify current pricing and availability directly on the retailer's site.
Editorial Credit
Gil Sapir, Editor
Gil Sapir edits ChargeTier's specification databases, sizing calculators, and comparison tables. If you spot a specification error or an outdated manufacturer datasheet reference, please reach out through our Contact page.
Editorial Independence & Affiliate Disclosure
ChargeTier is reader-supported. When you click outbound retail links (such as Amazon or manufacturer store links) and purchase a product, we may earn an affiliate referral commission at no additional cost to you. Affiliate relationships do not alter the technical specifications, NEC sizing formulas, or vehicle compatibility calculations shown on our pages.