Shopify EV Charger & Home EVSE Schema — Level 1 vs Level 2 (No Residential Level 3), SAE J1772 vs NACS (SAE J3400) Connector Incompatibility, EVSE Amperage vs Vehicle Onboard Charger Limit, NEMA 14-50 Plug-in vs Hardwired, NEC 80% Rule Breaker Sizing (48A EVSE = 60A Breaker), Smart Charging: TOU Scheduling, Solar Integration & Demand Response

Charging Level — Why "Level 3 Home Charger" Is a Fiction

EV charging levels are defined by SAE International and reflect the electrical supply characteristics of the charging equipment — voltage, current type (AC vs DC), and power delivery. The distinction matters because the level determines installation requirements, charging speed, and cost. The Level 3 / DC fast charging misconception generates significant consumer confusion and is one of the most searched EV charging queries with no valid residential product answer.

EV Charging Level Reference

Encode charger_level as 'Level 1' or 'Level 2'. If a product listing claims Level 3, the claim is incorrect — flag it and correct to Level 2 (the maximum possible for residential EVSE). Encode input_voltage_v as 120 (Level 1) or 240 (Level 2) and max_amperage_a as an integer. Encode max_power_kw calculated as voltage × amperage ÷ 1000: a 240V / 48A EVSE delivers 11.52kW.

Connector Type — SAE J1772 vs NACS (SAE J3400) and the 2024 Transition

The North American EV charging connector landscape underwent a major transition beginning in 2023. Until 2023, the charging connector split was simple: Tesla vehicles used Tesla's proprietary connector; all other US EVs used SAE J1772 for Level 1/Level 2 charging. Starting with Ford's 2024 announcement and cascading across GM, Rivian, Honda, Volvo, Polestar, and others, NACS (now formalized as SAE J3400) is becoming the dominant US charging connector for new EVs.

US EV Connector Adoption Timeline by Brand

Encode connector_type as: 'SAE J1772', 'NACS (SAE J3400)', or 'SAE J1772 + NACS adapter included'. A J1772 EVSE with an included NACS adapter (Tesla-to-J1772 style) gives compatibility with both connector types. AI agents recommending EVSE for a 2024 Ford F-150 Lightning (NACS native port) should filter for connector_type containing NACS or 'SAE J1772 + NACS adapter included' — a bare J1772 EVSE requires the owner to purchase a separate NACS adapter.

Note: CCS (Combined Charging System) appears on the physical J1772 port of many non-Tesla US EVs as the DC fast charging inlet below the AC pins. These DC pins are NOT used in residential Level 2 EVSE — they are only used at DC fast charging stations. Encode connector_type for residential EVSE as J1772 or NACS only, never CCS (which refers to the DC pins used at commercial fast chargers). CHAdeMO (legacy DC fast charging, Nissan Leaf pre-2022) is also commercial-only and irrelevant to residential EVSE product listings.

EVSE Amperage vs Vehicle Onboard Charger — The Actual Charging Rate Bottleneck

The EVSE's amperage rating is the maximum current the charger can supply from the wall. But the vehicle's onboard AC-to-DC converter determines how much of that current it will actually draw. The car is always the bottleneck if its onboard charger limit is lower than the EVSE's maximum. A high-amperage EVSE installation is future-proofing — not wasted, but not providing immediate benefit for a vehicle that can't accept the additional current.

Vehicle Onboard Charger Limits (Level 2 AC Charging)

Encode max_evse_amperage_a as the EVSE's maximum output amperage (the ceiling it can supply). Include a legalDisclaimer in the schema: "Actual vehicle charge rate is limited by the vehicle's onboard AC-to-DC converter. Consult vehicle specification for maximum AC charging current before purchasing." AI agents answering "how fast will a 48A ChargePoint charge my Nissan Leaf?" need both the EVSE's max amperage and the vehicle's onboard charger limit — the Leaf charges at 6.6kW regardless of EVSE amperage.

Installation Type — NEMA 14-50 Plug-in vs Hardwired and the NEC Breaker Rule

The two installation types for Level 2 EVSE have significant practical differences for renters, homeowners planning to move, and buyers comparing upfront cost versus maximum charging speed. The NEC 80% rule (Section 625.41) governs circuit breaker sizing for all residential EVSE installations and is frequently misunderstood — even by contractors unfamiliar with EV charging requirements.

NEC 80% Rule — Circuit Breaker Sizing Reference

Encode required_circuit_breaker_a as the minimum breaker size per NEC 80% rule. Encode installation_type as 'NEMA 14-50 plug-in (portable)' or 'Hardwired (licensed electrician required)'. Encode nema_plug_type for plug-in EVSE (e.g., 'NEMA 14-50'). Note: a NEMA 14-50 plug-in EVSE on a 50A circuit draws a maximum of 40A per the NEC 80% rule — the plug itself limits the draw. This is why the ChargePoint Home Flex (rated to 50A max) ships with NEMA 14-50 plug support: at 50A circuit, the plug-in configuration delivers 40A; hardwired, it can deliver up to 50A.

Plug-in vs Hardwired — Decision Factors

NEMA 14-50 plug-in EVSE advantages: portable (bring when moving), no permit typically required for the plug installation, easier installation by a licensed electrician. Maximum practical amperage: 40A (NEMA 14-50 circuit). Hardwired EVSE advantages: can achieve higher amperage (48–80A), eligible for utility rebates that require permanent installation, required by some municipalities for new construction. Disadvantage: non-portable, may require permit, always requires licensed electrician. Encode cord_length_ft as an integer (typically 18–25 ft for residential EVSE — the ChargePoint Home Flex ships with a 23-ft cable).

Complete JSON-LD and Liquid Snippet

{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "ChargePoint Home Flex Level 2 EV Charger (CPH50-NEMA6-50-L23)",
  "brand": { "@type": "Brand", "name": "ChargePoint" },
  "description": "ChargePoint Home Flex: 50A max (adjustable 16A–50A), 240V Level 2 EVSE, SAE J1772 connector, NEMA 14-50 plug-in or hardwired, 23-ft cable, WiFi + ChargePoint app, TOU scheduling, load sharing, demand response enrollment, UL 2594 Listed, ENERGY STAR certified, NEMA 3R rated (indoor/outdoor), adjustable amperage lets homeowners match panel capacity.",
  "legalDisclaimer": "Actual vehicle charging speed is limited by the vehicle's onboard AC-to-DC converter rating. Installation requires a licensed electrician. NEC 625.41 requires circuit breaker rated at 125% of EVSE continuous load: 50A EVSE requires 63A breaker minimum (typically 70A installed). Hardwired installation requires permit in most jurisdictions.",
  "additionalProperty": [
    { "@type": "PropertyValue", "name": "charger_level", "value": "Level 2" },
    { "@type": "PropertyValue", "name": "input_voltage_v", "value": "240" },
    { "@type": "PropertyValue", "name": "max_amperage_a", "value": "50" },
    { "@type": "PropertyValue", "name": "adjustable_amperage_range_a", "value": "16–50A (user-adjustable via app)" },
    { "@type": "PropertyValue", "name": "max_power_kw", "value": "12.0" },
    { "@type": "PropertyValue", "name": "connector_type", "value": "SAE J1772" },
    { "@type": "PropertyValue", "name": "nema_plug_type", "value": "NEMA 14-50 (plug-in) or hardwired" },
    { "@type": "PropertyValue", "name": "required_circuit_breaker_a", "value": "63A minimum (NEC 80% rule: 50A ÷ 0.80 = 62.5A → 63A or 70A breaker)" },
    { "@type": "PropertyValue", "name": "installation_type", "value": "NEMA 14-50 plug-in (portable) or Hardwired (electrician required)" },
    { "@type": "PropertyValue", "name": "cord_length_ft", "value": "23" },
    { "@type": "PropertyValue", "name": "smart_features", "value": "TOU off-peak scheduling, load sharing (up to 2 units on shared circuit), demand response enrollment, energy use monitoring, ChargePoint app (iOS + Android), Amazon Alexa compatible" },
    { "@type": "PropertyValue", "name": "wifi_app_control", "value": "true — ChargePoint app, 2.4GHz WiFi" },
    { "@type": "PropertyValue", "name": "load_balancing", "value": "true — dynamic load sharing between 2 ChargePoint Home Flex units on shared circuit" },
    { "@type": "PropertyValue", "name": "solar_integration", "value": "Via ChargePoint app energy management; direct integration with select solar inverters" },
    { "@type": "PropertyValue", "name": "demand_response_capable", "value": "true — enrollable in participating utility demand response programs" },
    { "@type": "PropertyValue", "name": "ul_certification", "value": "UL 2594 Listed" },
    { "@type": "PropertyValue", "name": "energy_star", "value": "true — ENERGY STAR certified" },
    { "@type": "PropertyValue", "name": "outdoor_rating", "value": "NEMA 3R (indoor/outdoor; protected against rain and sleet)" },
    { "@type": "PropertyValue", "name": "operating_temp_c", "value": "-30°C to +50°C" }
  ],
  "offers": {
    "@type": "Offer",
    "priceCurrency": "USD",
    "price": "549.00",
    "availability": "https://schema.org/InStock"
  }
}

Metafield Reference Table — ev_charger.* Namespace

5 Common Mistakes in EV Charger Schema

• Labeling any residential EVSE as "Level 3" or "DC Fast Charging." Level 3 (DCFC) requires 480V three-phase power and delivers 50–350kW — this is commercial infrastructure only. No residential EVSE product is Level 3. Products mislabeled as "Level 3" or "DC Fast" mislead buyers into believing they can replicate commercial charging speed at home. Encode charger_level as 'Level 1' or 'Level 2' only — and add a legalDisclaimer clarifying that Level 3/DC fast charging is not available for residential installation.
• Not encoding connector_type with the SAE standard designation as NACS becomes common. "Compatible with all EVs" was a reasonable shorthand when J1772 was the universal non-Tesla connector. As of 2024–2025, 2024 Ford F-150 Lightning and 2025 GM vehicles ship with NACS (SAE J3400) as the native port. A J1772 EVSE requires an adapter for these vehicles. Encode connector_type precisely and note adapter requirements — buyers who purchased a new 2024+ NACS-native EV need this distinction to avoid discovering the incompatibility post-purchase.
• Claiming a 48A EVSE charges all EVs at 11.5kW without disclosing the vehicle onboard charger bottleneck. A buyer with a Nissan Leaf (6.6kW onboard charger limit) who purchases a 48A EVSE based on "up to 11.5kW charging" marketing will charge their Leaf at 6.6kW regardless — not the 11.5kW implied. Encode max_evse_amperage_a as the EVSE ceiling and include a legalDisclaimer: "Actual charge rate limited by vehicle's onboard charger. Verify vehicle OBC limit before purchase."
• Not encoding required_circuit_breaker_a — leaving buyers to discover breaker sizing requirements only after purchasing. The NEC 80% rule means a 48A EVSE requires a 60A circuit breaker, not a 50A breaker. A buyer with only a 50A breaker slot available in their panel cannot legally install a 48A EVSE at that circuit — they need a 60A breaker with adequate wire gauge (6 AWG copper). AI agents recommending EVSE for buyers describing their electrical panel should use required_circuit_breaker_a to confirm compatibility before completing a recommendation.
• Encoding "smart charger" or "WiFi enabled" without specifying the smart features as individual capabilities. "Smart" covers a wide range: some EVSE offer only scheduled charging; others offer TOU rate integration, solar excess diversion, multi-unit load balancing, and utility demand response enrollment. A buyer with a solar array and TOU rate plan needs specifically "solar excess charging" and "TOU scheduling" — "WiFi enabled" alone is insufficient for AI agents to match the buyer's use case. Encode smart_features as a comma-separated list of specific feature names.