LENZ Level 2 EV Charger (Model EVSE-NAW401) Instruction Manual

1. Introduction

The LENZ Level 2 EV Charger (Model EVSE-NAW401) is designed to provide efficient and reliable charging for electric vehicles. This manual contains essential information for the safe and effective installation, operation, and maintenance of your EV charger. Please read this manual thoroughly before use and retain it for future reference.

Key features include:

• Fast Level 2 Charging: Delivers up to 40A (9.6 kW at 240V) for significantly faster charging than standard Level 1 chargers.
• ETL Listed for Safety: Certified to UL 2594 standards, ensuring electrical safety and performance.
• NEMA 4X / IP67 Weatherproof: Constructed with corrosion-resistant materials and sealed electronics for indoor or outdoor installation, operating in temperatures from -22 °F to 122 °F.
• Universal J1772 Connector: Compatible with all J1772 EVs. Tesla vehicles require a LENZ J1772 to Tesla Adapter (sold separately).
• 24-Foot Charging Cable: Provides ample reach for convenient charging.

Figure 1: LENZ Level 2 EV Charger showing the main unit, NEMA 14-50 plug, and J1772 connector.

2. Safety Information

Before installing or using the LENZ EV Charger, please observe the following safety precautions to prevent electric shock, fire, or serious injury:

• Qualified Electrician: Installation of the NEMA 14-50 outlet must be performed by a qualified electrician in accordance with all local and national electrical codes.
• Dedicated Circuit: Ensure the NEMA 14-50 outlet is on a dedicated circuit with appropriate overcurrent protection (e.g., a 50A breaker for a 40A charger).
• Heavy-Duty Outlet: Use only heavy-duty, industrial-grade NEMA 14-50 outlets designed for frequent plugging and unplugging, and continuous high current draw. Standard household outlets are not suitable for EV charging and can pose a fire hazard due to overheating.
• Proper Torque: Ensure all terminal screws in the outlet are torqued to the manufacturer's specifications (typically 75 inch-pounds for heavy-duty outlets) to prevent loose connections and overheating.
• No Extension Cords: Never use extension cords or adapters with the EV charger.
• Inspect for Damage: Do not use the charger if the EVSE unit, charging cable, or connector is damaged. Contact customer support immediately.
• Weather Protection: While the unit is NEMA 4X / IP67 weatherproof, ensure the NEMA 14-50 outlet is also rated for outdoor use if installed outdoors, or protected from direct weather exposure.

Figure 2: The LENZ EV Charger is ETL Listed and FCC Certified, ensuring compliance with North American safety standards.

3. Installation

The LENZ EV Charger is designed for straightforward installation once a suitable NEMA 14-50 outlet is in place. Professional installation of the outlet is highly recommended.

3.1 What's in the Box

• LENZ Level 2 EV Charger Unit
• Mounting Bracket
• Wall-Mounted Holster for J1772 Connector
• 24-Foot Charging Cable with J1772 Connector and NEMA 14-50 Plug

3.2 Mounting the Charger Unit

1. Select a suitable location near your NEMA 14-50 outlet, ensuring it is within reach of your vehicle's charging port and allows for proper cable management.
2. Secure the provided mounting bracket to a wall stud or appropriate anchor points using suitable hardware (not included). Ensure the bracket is level and firmly attached.
3. Slide the LENZ EV Charger unit onto the mounted bracket until it clicks into place.
4. Insert the security pin (if provided) through the designated hole on the side of the charger and bracket to prevent accidental removal.

3.3 Mounting the J1772 Holster

Mount the J1772 holster at a convenient height and location near the charger unit to store the charging connector when not in use. This helps protect the connector and keeps the cable tidy.

Figure 3: The LENZ EV Charger installed on a wall, demonstrating its compact design and connection points.

Figure 4: Illustration of the NEMA 14-50 outlet and the J1772 vehicle charging port, highlighting compatibility.

4. Operating Instructions

The LENZ EV Charger is designed for simple plug-and-charge operation.

4.1 Charging Your EV

1. Ensure the NEMA 14-50 plug of the charger is securely inserted into a properly installed heavy-duty NEMA 14-50 outlet.
2. Take the J1772 connector from its holster.
3. Open your electric vehicle's charging port.
4. Firmly insert the J1772 connector into your vehicle's charging port. You should hear a click, indicating it is securely latched.
5. The charger will automatically begin communicating with your vehicle and initiate charging. The LED indicator on the charger unit will illuminate to show charging status.
6. To stop charging, simply press the release button on the J1772 connector and pull it out from your vehicle's charging port. Return the connector to its holster.

4.2 Tesla Vehicle Compatibility

For Tesla vehicles, a J1772 to Tesla adapter is required. This adapter typically comes with your Tesla vehicle or can be purchased separately from LENZ or other retailers. Connect the J1772 connector from the LENZ charger to the adapter, then plug the adapter into your Tesla's charging port.

5. Maintenance

The LENZ EV Charger requires minimal maintenance. Follow these guidelines to ensure optimal performance and longevity:

• Regular Cleaning: Periodically wipe down the charger unit and cable with a damp cloth to remove dust and dirt. Do not use harsh chemicals or abrasive cleaners.
• Cable Inspection: Regularly inspect the charging cable and connector for any signs of wear, cuts, fraying, or damage. If any damage is found, discontinue use immediately and contact customer support.
• Proper Storage: Always return the J1772 connector to its holster when not in use to protect it from damage and environmental elements.
• Environmental Protection: Although weatherproof, avoid prolonged exposure to extreme conditions or direct water spray if possible, especially for the NEMA 14-50 plug connection.

Figure 5: The LENZ EV Charger's IP67 rating ensures protection against dust and water, making it suitable for various environments.

6. Troubleshooting

If you encounter issues with your LENZ EV Charger, refer to the following common problems and solutions:

• Charger Not Activating:
  • Ensure the NEMA 14-50 plug is fully inserted into the outlet.
  • Check your home's circuit breaker to ensure it hasn't tripped.
  • Verify the J1772 connector is securely latched into the vehicle's charging port.
  • For Tesla vehicles, confirm the J1772 to Tesla adapter is correctly attached and functioning.
• Slow Charging or Reduced Charge Rate:
  • This can occur if the NEMA 14-50 outlet or its wiring is overheating. Immediately discontinue charging and have a qualified electrician inspect the outlet and wiring. As highlighted in Video 1, using a heavy-duty, properly installed outlet is crucial for maintaining optimal charge rates and preventing safety hazards.
  • Ensure your vehicle's charging settings are not limiting the charge rate.
• Overheating (Outlet or Adapter):
  • If the NEMA 14-50 plug, outlet, or J1772 adapter feels hot to the touch, immediately unplug the charger. This indicates a potential safety hazard.
  • Consult a qualified electrician to inspect the outlet and wiring. Replace any non-heavy-duty outlets with appropriate EV-rated heavy-duty outlets.
  • Ensure the adapter (if used) is rated for the current being drawn and is in good condition.
• No Power Indicator:
  • Check the circuit breaker.
  • Ensure the NEMA 14-50 plug is fully seated.

If issues persist after following these steps, please contact LENZ customer support.

7. Specifications

8. Warranty and Customer Support

LENZ stands behind its products with a 3-year warranty. For any questions, technical assistance, or warranty claims, please contact our US-based customer support team.

Contact information can typically be found on the product packaging or the official LENZ website.

Figure 6: LENZ offers a 3-year warranty and dedicated US-based customer support for their products.