We put the Grizzl-E Classic EV Charger to the test with the Jeep Wrangler 4xe, evaluating its daily charging performance and real-world energy efficiency. Does this rugged charger live up to its reputation? Here’s what we found
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Best EV Charger for the Jeep Wrangler 4xe
We recommend the rugged Grizzl-E Classic Level 2 EV charger as the ideal off-road charging companion for the Jeep Wrangler 4xe. With 93% efficiency across our entire EV charging system — not just the charger—the Grizzl-E delivers 7.7 kW of power, fully charging the 17.3 kWh battery in just 2 hours and 40 minutes.
Grizzl-E Classic EV Charger Review
Grizzl-E Classic EV Charger Key Specs
- Output: Up to 40A (10kW)
- Connector: J1772
- Weatherproof Rating: IP67 (Water & dust resistant)
- Cable Length: 24 feet
- Adjustable Power: 16A, 24A, 32A, 40A
Installing & Setting Up the Grizzl-E Classic for Jeep 4xe Charging
Installing and setting up the Grizzl-E Classic EV charger to charge our Jeep 4xe was straightforward, below is our electric vehicle branch circuit for the Grizzl-E Classic EV charger optimized for our Jeep 4xe charging.
Since the Jeep Wrangler 4xe can charge at a maximum of 32 amps, we used a Siemens 40-amp dedicated double-pole breaker in our 240V electrical panel to protect the Grizzl-E Classic’s branch circuit.
Siemens 40-Amp Double-Pole Circuit Breaker
We also used 8 AWG solid copper wire to connect the Hubbel NEMA 14-50 outlet, which allows the Grizzl-E to deliver 32 amps of continuous current, without overheating or melting due to continuous loads.
HBL9450A NEMA 14-50 Receptacle for Level 2 EV Charger Installation (Plug-In)
Since the Jeep Wrangler 4xe has a 32-amp onboard charger and can accept up to 7.7 kW at 240V, we set the Grizzl-E Classic to 32A to optimize efficiency and safety.
Matching the Grizzle-E EV charger’s output to the Jeep Wrangler’s maximum charging capacity prevents unnecessary energy draw, avoids circuit overloading, reduces heat buildup, and helps improve battery life. We achieved this by adjusting the DIP switches: switch 1 up, switch 2 down, switch 3 up, and switch 4 down. The electric vehicle branch circuit diagram above includes a snippet showing our DIP switch settings.
We mounted the Grizzl-E Classic on an outdoor wall near our driveway using the included bracket and secured it with the Grizzl-E Classic outdoor safety lock. Unlike smart chargers that require Wi-Fi setup, the Grizzl-E Classic is a simple plug-and-play portable Level 2 EV charger. Just plug it into a compatible NEMA 14-50 outlet, and you’re ready to charge your Jeep.
The included bracket feels flimsy for long-term cable management and lacks strong hooks. We recommend the Lectron Electric Vehicle Charger Nozzle Holster Dock & J-Hook Combo for all J1772 EVs. It provides a sturdy dock and hook, keeping your space organized while protecting your charger from damage.
Grizzl-E Classic Charging Performance on the Jeep 4xe
The Jeep Wrangler 4xe, with its 17.3 kWh battery and 7.7 kW charging capability, was tested with the Grizzl-E Classic on a 32-amp NEMA 14-50 circuit to evaluate charging performance.
Over 14 days, we used the Jeep Wrangler 4xe as a daily driver in all-electric mode, which has an EPA-estimated all-electric range of 21 miles per charge. We tested the Grizzl-E Classic EV charger under various conditions, aiming to maintain the State of Charge (SoC) between 20% and 80%. This approach follows the 80/20 EV charging rule to optimize battery health and efficiency.
To prevent interference from the Energy Management System (EMS), we tested under low-power demand conditions and ensured preconditioning. Each test day began with a SoC above 80%.
The chart below illustrates the 14-day charging and discharging patterns, highlighting key performance insights.
Analyzing the Grizzl-E Classic’s charging data and the Jeep Wrangler 4xe’s discharging patterns, we found that the charger maintained a consistent 7.7 kW output between 20–80% SoC, while the vehicle averaged 1.27 miles per kWh in real-world driving.
We tracked the power delivered to the battery and recorded charge time, visualized in the energy vs. charging time chart below.
Charging the Jeep Wrangler 4xe with the Grizzl-E Classic took an average of 2 hours and 40 minutes, reaching speeds of 7.7 kW with 93% efficiency. Independent meter-based testing and the vehicle’s onboard energy readout using the Autel MaxiSys Ultra EV confirmed this efficiency, validating the charger’s consistent output.
At 20–80% SoC, the Grizzl-E Classic maintained stable charging speeds with a consistent linear charging pattern, delivering efficient and reliable performance with minimal power losses or throttling under continuous load.
Overall, the Grizzl-E Classic demonstrated stable, efficient charging on the Jeep 4xe, maintaining a consistent output with minimal losses over 14 days.
Potential Alternatives
Grizzl-E Smart EV Charger Review
Charge Point Home Flex EV Charger Review
JuiceBox 40 Amp EV Charger Review
Final Verdict – Is It Worth It?
Yes, the Grizzl-E Classic is a reliable, high-performance Level 2 charger that delivers consistent speeds, minimal power losses, and a hassle-free charging experience for the Jeep Wrangler 4xe. It efficiently utilizes the vehicle’s 7.7 kW charging capacity, ensuring fast and stable energy delivery.
While it skips smart features like WiFi and app controls, this no-frills charger focuses on reliability, ruggedness, and efficiency—ideal for off-road adventurers who want a dependable home charging solution.
⭐ Rating: 8.7/10 – Highly recommended for Jeep 4xe owners seeking a durable and efficient charger without extra tech distractions.
Do You Own the Grizzl-E Classic?
Have you used the Grizzl-E Classic with your Jeep 4xe? Did it meet your expectations? Drop a comment below and let us know!
James Ndungu is a certified EV charger installer with over five years of experience in Electric Vehicle Supply Equipment (EVSE) selection, permitting, and installation. He holds advanced certifications, including the Electric Vehicle Infrastructure Training Program (EVITP), and diplomas in Electric Vehicle Technology and Engineering Fundamentals of EVs. Since 2021, James has been a frequent tester of EV chargers and accessories, providing expert insights into the latest EV charging solutions.
A 7% energy loss is not “slight”, and wondering how you measured this. Is this due to the NEMA plug, or in-effeciency in the Grizzl-E design?
A 5-7% energy loss may seem significant, but it’s within the typical range for Level 2 EV charging. We recorded charging data (what we were paying for) and battery data (what was actually stored) over 14 days while testing the Grizzl-E Classic on a Jeep Wrangler 4xe and found an overall charging efficiency of 93%.
Charging losses occur due to heat dissipation, power conversion inefficiencies, and resistance in the EV charging branch circuit from the electrical panel to the EV battery. This isn’t specific to the Grizzl-E charger—most Level 2 chargers and EVs experience some degree of energy loss.
Simply put, you might pay for 17 kWh from the grid or a charging station but only see 15.81 to 16.15 kWh kWh reach your battery. These losses occur during the charging process itself, not just because of the NEMA plug or the charger’s design.