Electric Motor Werks is a privately held company based in California and led by a team from Princeton, Stanford, Google, McKinsey, BMW, and Tesla. With such a talented team, it’s no wonder that they were able to produce highly advanced charged packed with many high-end features, including sub-3-second control response latency, precise charging rate control, programmable AGC-style local response profiles, and advanced mobile/web user interface.

The company goes the extra mile to minimize their operating costs and manufacturing costs while meeting some of the strictest quality standards in the industry, in order to maximize their return on investment and provide end customers with fantastic value and quality products. Unlike some other EVSE manufacturers who are fairly limited in the scope of their industry involvement, Electric Motor Werks plans to deploy over ten thousand stations this year, including those associated with a leadership role in the California Public Utilities Commission submetering pilot. The company is partnering with a number of key players in the energy space to maximize the utility of its network.

Unsurprisingly, we are very excited to have the opportunity to look closely at their electric vehicle service equipment and see how it holds up against its competition.

Available Options

The JuiceBox EV Charger is available in three configurations: JuiceBox Pro 75, JuiceBox Pro 40, and JuiceBox 40.

The Pro 75 is their smartest station, featuring Wi-Fi connectivity, a set of advanced JuiceNetTM features, energy metering, scheduling, notifications, smartphone app, and more. What’s more, it’s the only charging station on the market that can max out the charging rate of Tesla dual charger cars.

A step below the JuiceBox Pro 75 is the JuiceBox Pro 40. It comes with the same set of connected, smart features as its more powerful brother, but provides “only” 40A of charging current.

Finally, there’s also the cost-effective 40-amp JuiceBox, which is ready to plug into any NEMA 14-50 outlet straight out of the box. It can be used either indoor or outdoor and is best suited for a customer who only wish to speed up their charging without paying for any extra features they might not even use.

Electric Motor Werks also sell a universal smart EV charging adapter called JuicePlug. This small, WiFi-connected adapter attaches to a regular charging cable of user’s current charging station, thus enhancing it with all common smart features and Internet connectivity. No tools or assembly is required, and the device should be compatible with all electric vehicles on the market.

What We Like

Portable: Because JuiceBox EV Chargers plug into regular outlets and don’t require hard-wired installations, they are highly portable and very cost-effective. The provided mounting bracket allows owners to remove the charger in just a few seconds and transport it to another location.

  • Fast charging: The 70A version of the charger can deliver up to 10x faster charge and is sufficiently powerful to charge even demanding vehicles from Tesla. Those who are lucky enough to own multiple electric vehicles can install two JuiceBoxes to share just one electrical line and configure them in such a way that they never exceed 80A of combined draw. But when either of them is not used, the other one is free to charge at the maximum rate of 70A.
  • Smart features: You would have to work hard to find a smarter charger than the JuiceBox. With Wi-Fi connectivity, a dedicated smartphone application that supports notifications, precise voltage and current measurements, persistent storage of energy data, and other features, JuiceBox is as smart as it gets.
  • Rugged design: The JuiceBox EV Charger is fully waterproof and capable of withstanding even complete submersion for several minutes. EMotorWerks proved this by submerging their 60A / 15kW Open Source JuiceBox EVSE under 12 gallons of ice and water for 5 minutes in their EVSE Ice Bucket Challenge.
  • Manufacturers warranty: When you purchase this charger, you’ll also receive a 3-year manufacturer’s warranty for home usage that covers just about all problems that you could possibly encounter.
  • Small footprint: Because the JuiceBox EV Charger is such a simple device (at least when it comes to its exterior), it’s also the smallest EVSE of its class on the market, measuring just 10″ x 6″ x 3.5″ and weighing approximately 18 pounds.
  • Heavy-duty cable: Despite the heavy loads that EVSE charging cables have to carry, they often don’t really feel adequately rugged. That’s definitely not the case with the JuiceBox EV Charger. The cable is heavy, durable, yet not too heavy.

What We Don’t Like

  • Lack of indicator lights: Perhaps the biggest downside to this charger – at least for most users – is the complete lack of any indicator lights on the unit. You would be looking in vain for a power indicator, a charging progress bar, or even just a simple blinking light to indicate that everything works as it should. While we often criticize overly bright LED lights that have a tendency to illuminate the entire backyard or garage, we are equally unhappy when we have no convenient way of telling whether or not the charger already finished or if it still continues pumping juice into our car battery.
  • Perhaps too industrial for some users: The enclosure is really nothing more than a simple metal box. As such, the charger occupies only a little space, but it may definitely feel like it lacks something in the looks department, especially when compared to chargers from Siemens or Bosch.


The JuiceBox EV Charger from Electric Motor Werks is definitely a charger worth recommending. Customers can choose a version that fits their individual needs, which allows them to avoid paying for something they might not even use. All chargers are very simple to install, leave little to nothing to be desired in terms of their functionality, and show the quality of engineering that Electric Motor Werks are capable of.


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