Frequently Asked Questions
Yes, it should be compatible with any J1772-enabled vehicle. All EVs currently sold in the US are J1772-enabled.Last updated:
the basic version of the JuiceBox will be a simple wall-mountable aluminum box. Approximate dimensions are 8x8x3 inchLast updated:
We will plan to sell a variety of cabling options to meet most of your needs. We will run a backer survey after the campaign to ask you what cable option you'd like - no need to specify now. We are getting special pricing direct from manufacturer on these so they will be offered at the lowest possible price.
INPUT CABLES - INCOMPLETE LIST. Final list will be determined based on your input throughout campaign. Missing your favorite option - tell us and if we see a lot of our backers asking for it, we will make it!
Primary cable options
1. 30A dryer plug with 10-12' long cable. Use this with your dryer outlet to get up to 7kW of EV charging power (assuming your EV charger is capable of using all this power)
2. By popular demand, 14-50 50A cable option will also be available. You can get up to 12kW of EV charging power through this setup (assuming your EV charger is capable of using all this power)
All other input configurations will be made by adding various adapters in front of the above 2 cables:
2. 30A dryer plug with 2 dryer sockets. Use this if you want to plug in the JuiceBox and dryer at the same time. In this case, you will need to take care not to turn on the JuiceBox and your dryer at the same time as it will result in tripping your circuit breaker
3. A single 120V plug to dryer socket adapter. Use it with your regular house outlets. Power will be limited to ~1.4-1.8kW depending on your 120V breaker ratings
4. dual 120V plug to dryer socket adapter. Use this to get a quick 240V from your regular house sockets (if your house has split-phase wiring - as most US houses do). Power will be limited to ~2.8-3.6kW depending on your 120V breaker ratings
OUTPUT J1772 CABLES:
1. 32A 27-foot (8-meter) cable. Up to 7.5kW of charging power
2. 70A 27-foot cable. Up to full 15kW JuiceBox rating
3 & 4. Same current ratings with 16-foot cable
5 & 6. 25-foot J1772 extension cord with same current ratings - for those extremely long cable runsLast updated:
Some of the photos seem to show a lower-current version of AC components. How will you get 60A on those?
The Premium kit contents shown above are for our 30A prototype that we have used for testing the overall schematics, firmware, and hardware design.
The AC components will be upgraded to 60A rated components for the production units. [UPDATE 07/15]: we will be using 80A rated relays / contactors for the production units to make sure things never fail at the JuiceBox rated 60A current. AWG6 wiring will be used for all power connections inside the JuiceBox regardless of the input / output cables selected.Last updated:
As you can see from the video on top of our project description, we expect the assembly of the basic kit to take 1-2 hours for a person with some experience in electronics. Premium kits will require 3-4 hours to assemble.
The kits will be optimized for hand assembly and will be based on through-hole components. The premium version's enclosures will have all the mounting holes predrilled. The base version's enclosure will have to be drilled (4-6 holes - nothing complicated).Last updated:
A couple of reasons for going with a completely different design:
1. We are reusing the platform that we have successfully worked with in our other products (e.g., our 12kW charging system, our motor control system, etc.)
2. We wanted it to be compatible with the existing Arduino shield ecosystem so we had to redesign at least the PCBs
3. We needed to optimize the design for manufacturability and total component costs. As a result, component selection is different
4. We commit to being a one-stop shop for all related components (kits, AC components, cables, wifi shields, etc). So you do not have to order components from 5 different suppliers and pay for shipping etc 5 times.
5. We offer the assembly service for the entire units
6. We have designed and manufacture our own unique enclosure (premium kits only). Stand out with your unique design.
7. We are planning production at 1000+ unit volume which allows us to deliver at extremely low prices but also requires full control over the design.
You can also expect a requisite level of support from EMW around the kits. Starting from the detailed manuals to EMW-moderated product forums. For example, check out our manual for the previous Open Source project - a 12kW EV charging system here: http://emotorwerks.com/VMcharger_V12P/EMW-12000_PFC-V12-Build_Notes.pdf.Last updated:
Do I need a 60A breaker and wiring if I'm only planning on charging my car at 16A? I already have the outlet wired for 20A and I would really rather not have to go and get a new breaker, outlet and wire
You will be able to charge at any current below the rated JuiceBox current (60A).
If you plan to charge at a lower rate, you will just set that limit for JuiceBox (there will be a way to adjust this in-field).
Your breaker will need to be sized for the current you are planning to charge at.Last updated:
All the production cars have built-in protection against non-compliant AC sources. If the charging station fails to communicate correctly to the vehicle, the vehicle will never start power transfer, keeping the internals safe. This protections are built in as safeguards against malfunctioning public charging stations etc.Last updated:
Many of you have asked about this. So we have decided to launch a KickStarter stretch goal for this feature!
If the campaign accumulates $40,000 or more, we will program the JuiceBox to work with the Arduino Wi-Fi shield (sold separately everywhere and will be available from our store, as well).
This will allow wireless access to the JuiceBox EVSE. We will also develop server-side software so that JuiceBox owners can check the status of their charging sessions and analyze the historical data remotely through a dedicated EMW website.
Help us reach this new high and bring an even better product to you, our backers!
In addition to WiFi, the JuiceBox will be able to use many of the Arduino shields for expansion in functionality. This includes bluetooth connectivity, data logging, camera / voice input, etc, etc. Possibilities are truly limitless.
We will be setting up a developer community around this platform and will be actively working on making sure that the various shields can be easily used with the JuiceBox.Last updated:
We are still finalizing pricing (negotiating with factories in China on 1,000+ unit orders is not super-quick but we are making good progress!).
Some references that should give you a good ballpark idea of the costs:
1. 32A 27-foot (8 meter) J1772 cable will be priced at $140-$160
2. Input cables will be priced between $25 and $50 depending on the option
We will try to bring them down even further - the more backers we have, the cheaper these things will become!
As mentioned above, we will be sending a backer survey after the campaign ends asking about your cable choices. We will include the latest price list along with that survey, as well.Last updated:
The pricing IS expected to go up after the campaign is over - a discounted pricing for our backers is our token of appreciation to our backers who decided to help us bring this to the market.
The expected increase is TBD but will probably be in the 15-30% range.
We will be posting new pricing around the campaign's end, along with posting the JuiceBox products to our online store at http://www.emotorwerks.com/products/online-storeLast updated:
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