How to Read EV Charger Specifications

EV charger specification sheets are dense with numbers. Some matter a lot; some matter little; some are marketing fluff. Knowing what to look for helps you compare chargers and pick the right one for your situation.

This article decodes the common specs you’ll see and explains which ones matter most.

The big three: voltage, amperage, power

These are the most important specs. Everything else is supporting. They relate to each other directly — get two and the third follows.

flowchart LR
  V[Voltage<br/>e.g. 240V] --> P[Power<br/>e.g. 7.7 kW]
  A[Amperage<br/>e.g. 32A] --> P
  P --> C[Charge speed<br/>up to car limit]
  style P fill:#e0f2fe,stroke:#0284c7
  style C fill:#dcfce7,stroke:#16a34a

If you are still fuzzy on why kW is speed and kWh is the amount delivered, the kW vs kWh explainer untangles the two.

Voltage

The electrical “pressure” the charger uses. In North America:

• 120V: Level 1 (standard household outlets).
• 208V or 240V: Level 2 (dedicated 240V circuits).

In Europe:

• 230V: single-phase AC.
• 400V: three-phase AC.

DC fast chargers operate at hundreds of volts (200-1000V typically).

Amperage

The “flow rate” of electricity. Determines maximum current.

Common Level 2 ratings:

• 16A — slow Level 2 (~3.8 kW at 240V).
• 24A — modest Level 2 (~5.8 kW at 240V).
• 32A — common Level 2 (~7.7 kW at 240V).
• 40A — common Level 2 (~9.6 kW at 240V).
• 48A — high-end Level 2 (~11.5 kW at 240V).
• 80A — very-high Level 2 (~19.2 kW at 240V; rare).

Continuous current (80% of rated) is what matters for sizing circuits.

Power

Voltage × Amperage = Power (in watts).

For 240V, 32A: 240 × 32 = 7,680 W = 7.7 kW.

This is the simplest meaningful number for comparing charger speed. Higher kW = faster charging up to your vehicle’s onboard capacity. The practical differences between the power tiers are covered in Level 1 vs Level 2 vs DC fast charging.

Continuous vs maximum power

A subtle distinction.

Maximum power: what the charger can do briefly. May be a peak.

Continuous power: what the charger can sustain indefinitely. This is what matters for charging.

For EV charging, sessions are long. Continuous specs are what matter. Maximum specs are marketing-friendly but practically less meaningful.

When you see “11.5 kW peak / 11 kW continuous,” focus on the 11 kW continuous number.

Connector type

What physical plug the charger uses. Determines vehicle compatibility.

For Level 2 chargers:

• J1772 (Type 1): North American standard for non-Tesla.
• NACS / J3400: Tesla and the emerging North American standard.
• Type 2 (Mennekes): European standard.
• Hardwired: no connector visible; cable terminates inside the charger.

For DC fast chargers:

• CCS1: North American DC fast.
• CCS2: European DC fast.
• NACS: Tesla and emerging North American DC.
• CHAdeMO: Japanese DC fast (older, fading).

Verify your vehicle’s inlet matches.

Cable length

How long the cable is. Matters for installation flexibility.

Typical Level 2: 20-25 feet (6-8 meters).

Longer cables ($50-$200 premium) accommodate wider parking arrangements but are heavier to handle.

For DC fast chargers, cables are shorter and heavier (often counterbalanced).

NEMA plug type (Level 2 portable / plug-in chargers)

If the charger has a plug (vs hardwired):

• NEMA 5-15: 120V Level 1 — basic.
• NEMA 6-50: 240V welder outlet style.
• NEMA 14-30: 240V dryer-style outlet.
• NEMA 14-50: 240V range-style outlet (most common for Level 2 plug-in).
• Hardwired: no plug, direct wiring.

NEMA 14-50 is the most common for installable Level 2 chargers. Hardwired enables higher amperage (48A+). Your choice here feeds directly into wiring and labor — see the cost of a Level 2 home charger install ^{(coming soon)}.

Smart features

A list of common smart-feature specs.

WiFi connectivity. Charger connects to your home WiFi for software updates and app features.

App integration. Manufacturer’s app for scheduling, monitoring, etc.

OCPP support. Open standard for commercial integrations. Mostly relevant if you’ll deploy in a managed setting; see what OCPP is for background.

Energy monitoring. Reports per-session energy delivered.

Scheduling. Set time windows for when charging happens.

Power-sharing / load management. Coordinates with other chargers on the same circuit to avoid tripping breakers.

Utility integration. Some chargers integrate with utility demand-response programs for rebates.

For most home users, WiFi + app + scheduling is enough. Power-sharing matters for multi-charger sites.

Mounting and physical specs

Indoor / outdoor rated. Crucial — check IP rating (below).

Pedestal mount option. For installations not against a wall.

Cable management. Some have integrated cable holders; others let it hang.

Dimensions. Width, height, depth. Matters for tight spaces.

Weight. 10-30 lbs typical. Affects mounting.

Cable holster/holder. Where to store the cable when not in use.

IP rating (water/dust resistance)

Two-digit code indicating ingress protection.

• IP44: splashed water from any angle. Indoor or covered outdoor.
• IP54: dust-protected and splash-resistant. Good for typical outdoor use.
• IP55: dust-protected and water jet from any direction. Better outdoor.
• IP65: dust-tight and water-resistant from low-pressure jets. Strong outdoor.
• IP67: dust-tight and waterproof briefly. Very protective.

For an outdoor wall-mounted installation, IP54 or IP55 is adequate. For exposed environments (high-rainfall regions, coastal), IP65+ is better.

Temperature rating

Operating temperature range, e.g., “-30°C to 50°C.”

For most of North America/Europe, standard ratings are adequate. For extreme cold (Alaska, Northern Canada, Nordic regions) or extreme heat (Phoenix, Saudi Arabia), check the rating against local conditions.

Safety certifications

Standards the charger meets.

• UL certification (US): UL 2594 for Level 2. Required for code compliance.
• CSA certification (Canada): Canadian Standards Association.
• CE mark (Europe): indicates conformity with EU regulations.
• IEC 61851: international standard for EV charging.

For home installations, UL/CSA certification matters for electrical code compliance and insurance.

Warranty

Typical Level 2 warranties: 3-5 years on the unit; sometimes longer on the cable.

Things to verify:

• Includes labor? Some only cover replacement; you pay for installation.
• Outdoor use covered? Some warranties exclude outdoor exposure damage.
• Transferable? If you sell your home, does the warranty transfer to the new owner?

Charger weight matters more than people think

A heavier charger is harder to install (more mounting hardware, more careful labor). For a wall-mounted unit, 20 lbs is fine; 35 lbs may need stronger mounting.

For portable / removable chargers, weight matters for daily handling.

What spec sheet items don’t really matter

A few specs that sound impressive but don’t materially affect EV charging experience.

Peak / burst power: unless your driving is unusual, continuous is what matters.

Theoretical maximum kW: if your vehicle can’t accept that much, irrelevant.

Theoretical range added per hour: depends entirely on your vehicle’s efficiency.

Charger weight (slightly): unless mounting is constrained.

Color of LEDs: marketing.

Voice commands: rarely useful.

Built-in display: nice but doesn’t affect charging quality.

A spec-comparison checklist

When shopping for a Level 2 charger, focus on these:

• Continuous power output (kW) at your installation’s voltage.
• Amperage rating that matches your panel and wiring.
• Connector type matching your vehicle.
• Cable length for your install.
• NEMA plug type (or hardwired).
• Indoor/outdoor rating (IP code).
• UL/CSA certification for code compliance.
• Smart features (if you want them).
• Warranty terms.
• Brand reputation (from independent reviews).

Anything beyond this is bonus.

For DC fast chargers (commercial)

A few additional specs for DC fast chargers if you’re spec’ing a commercial install.

Output voltage range. EVs operate at different battery voltages (200-900V). Wider range = more vehicles supported.

Output current. Limits per-stall power.

Number of stalls / ports. Single-stall vs multi-stall pedestals.

Power-sharing architecture. Some multi-stall chargers share a power pool; others have dedicated power per stall.

Cooling system. Liquid-cooled cables enable higher power.

OCPP version supported. 2.0.1 minimum for new commercial deployment.

Payment terminal. Card reader, contactless support.

These specs are typically only relevant for commercial deployments; consumers don’t shop for DC fast chargers.

The honest summary

EV charger specifications can look intimidating but the core ones (voltage, amperage, power, connector, IP rating, certifications) are what matter. Most other specs are detail or marketing. Match the charger’s continuous power to what your vehicle can accept; match the connector to your vehicle’s inlet; size the installation for the amperage. Get those right and the rest is preference.