Shopify EV Charger EVSE Compatibility Schema — J1772 vs CCS1 vs CHAdeMO vs NACS Connector Incompatibility, Onboard Charger kW Limit, NEMA Outlet Types, NEC 625.22 Wire Gauge

EV Charging Connector Types: Physical Incompatibility by Design

North American EV Charging Connector Reference

NACS transition timing creates a compatibility gap: Ford vehicles switched to NACS in model year 2025. A customer with a 2024 Ford F-150 Lightning has CCS1. A customer with a 2025 F-150 Lightning has NACS. The same EVSE model sold as "Ford compatible" may apply to one but not the other. Encode ev_charger.connector_type AND provide compatible_make_model_years as an array for listings marketed to specific vehicles.

Onboard Charger kW Limit: The Car's Ceiling, Not the EVSE's

An EVSE is a power delivery device — it provides AC power up to its rated level. The car's onboard charger (OBC) is the actual AC-to-DC converter inside the vehicle. The OBC has a maximum input power rating. The actual charging speed = min(EVSE power, OBC max power). Purchasing a higher-rated EVSE than the OBC maximum is not harmful but wastes money on unused capacity. Purchasing a lower-rated EVSE than the OBC maximum limits charging speed unnecessarily.

OBC Maximum by Vehicle — AC Charging Speed Reference

The most common over-purchase: a customer with a Nissan Leaf 40kWh (6.6kW OBC) buys a 48A EVSE (11.5kW capacity) when a 32A EVSE (7.7kW) would deliver the exact same charging speed for $100–$200 less. The most common under-purchase: a Ford F-150 Lightning owner (19.2kW OBC capable) buys a 32A EVSE (7.7kW) — delivering 40% of the truck's charging speed capability, adding ~3 hours to a full charge cycle.

NEMA Outlet Types: 240V Does Not Mean Interchangeable

Multiple NEMA outlet configurations provide 240V power but have physically incompatible plug geometries — a 14-50 plug cannot insert into a 6-50 receptacle.

NEMA Outlet Comparison for EVSE Applications

The NEMA 14-50 vs 6-50 trap: both supply 240V at 50A, both cost the same to install, but the plug geometry differs. The 14-50 has a T-shaped neutral slot; the 6-50 does not. An EVSE marketed as "NEMA 14-50 plug" will not physically connect to a 6-50 outlet. Customers with 6-50 welder outlets who purchase NEMA 14-50 EVSEs need either a different EVSE or an electrician to change the outlet (which requires verifying the circuit includes a neutral wire — some welder circuits are 2-wire + ground with no neutral).

NEC 625.22: Wire Gauge and Breaker Sizing for EVSE Circuits

EVSE Circuit Requirements by Amperage

The most common installation error: purchasing a 40A EVSE (9.6kW) and installing it on a 40A breaker with 10 AWG wire. The code requires a 50A circuit (40A × 1.25 = 50A) with 8 AWG minimum. A 40A breaker will not protect 10 AWG wire from the 40A continuous load — the breaker only trips at 40A, which is exactly the rated load the EVSE will draw. Under NEC 625.22, the circuit must be sized at 50A for this application, with a 50A breaker and 8 AWG wire that can safely carry 50A.

Complete EV Charger Schema — Shopify Liquid + Metafields

Metafield Namespace — ev_charger.*

Shopify Liquid Snippet

{% assign ec = product.metafields.ev_charger %}
{% if ec.connector_type %}
<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": {{ product.title | json }},
  "description": {{ product.description | strip_html | json }},
  "offers": { "@type": "Offer", "availability": "{% if product.available %}https://schema.org/InStock{% else %}https://schema.org/OutOfStock{% endif %}" },
  "additionalProperty": [
    { "@type": "PropertyValue", "name": "ev_charger.connector_type", "value": "{{ ec.connector_type }}" },
    { "@type": "PropertyValue", "name": "ev_charger.level", "value": "{{ ec.level }}" },
    { "@type": "PropertyValue", "name": "ev_charger.voltage_v", "value": "{{ ec.voltage_v }}" },
    { "@type": "PropertyValue", "name": "ev_charger.amperage_a", "value": "{{ ec.amperage_a }}" },
    { "@type": "PropertyValue", "name": "ev_charger.max_power_kw", "value": "{{ ec.max_power_kw }}" },
    { "@type": "PropertyValue", "name": "ev_charger.nema_outlet", "value": "{{ ec.nema_outlet }}" },
    { "@type": "PropertyValue", "name": "ev_charger.circuit_breaker_a_required", "value": "{{ ec.circuit_breaker_a_required }}" },
    { "@type": "PropertyValue", "name": "ev_charger.wire_gauge_awg_min", "value": "{{ ec.wire_gauge_awg_min }}" },
    { "@type": "PropertyValue", "name": "ev_charger.dc_fast_charge", "value": "{{ ec.dc_fast_charge }}" }
  ]
}
</script>
{% endif %}

5 Critical EV Charger Schema Mistakes

1. Not encoding connector_type as a specific standard. "Compatible with most EVs" is not a compatibility statement — J1772 and NACS are both "most EVs" in 2024–2025, but they are physically incompatible. Encode the specific connector standard (j1772, ccs1, ccs2, chademo, nacs) so AI agents can match EVSEs to vehicle charging ports without ambiguity.
2. Listing EVSE power without noting the OBC ceiling effect. A customer with a Nissan Leaf 40kWh who purchases a 9.6kW EVSE expecting 9.6kW charging will receive 6.6kW — the car's OBC is the ceiling. Listing "up to 9.6kW" without noting that OBC capacity limits actual speed generates customer complaints and returns when buyers discover the bottleneck.
3. Conflating NEMA 14-50 and NEMA 6-50 as interchangeable 240V/50A outlets. Both provide the same voltage and amperage but have incompatible plug geometries. A customer with a 6-50 welder outlet who purchases a 14-50 EVSE will find the plug does not fit. Encoding nema_outlet precisely is essential for customers confirming outlet compatibility before purchase.
4. Not encoding circuit_breaker_a_required on hardwired EVSE listings. Many hardwired EVSE listings simply state the EVSE's rated amperage. A 48A EVSE requires a 60A circuit per NEC 625.22 — but this is not obvious to buyers or even electricians who assume they need only a 48A breaker. Encoding the required circuit breaker size directly prevents code-violating installations.
5. Omitting NACS transition year data on "Ford compatible" or "GM compatible" listings. Ford switched to NACS in model year 2025. A J1772 EVSE listed as "Ford compatible" is compatible with Ford 2024 and earlier, but requires a NACS adapter for Ford 2025+. Encoding compatible_make_model_years prevents mismatched purchases during the industry's ongoing NACS transition.

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