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Dear Pilot participant -

This page details the potential data issues with your submeter energy data that could affect your electrical bills for the months of November and December of 2015.

Quick summary:

  1. eMotorWerks server-side data processing software suffered an issue causing incorrect reporting of some charging data between October 26, 2015 and January 8, 2016

  2. We estimate that this issue could result in 16-24% of the EV charging load during that period to be billed as general house load for some customers

  3. We have sent a note to all submetering pilot customers in February 2016, offering reimbursement for any potential overbilling that resulted from this issue. If you believe your bill might have been affected, please send your electrical bills for 6 months from September 2015 to February 2016 to This email address is being protected from spambots. You need JavaScript enabled to view it..

Detailed description:

We have received the first complaints from our customers in the second half of December last year as the customers were reviewing their prior cycle bills. Across the 3-5 initial complaints in December, participants have generally reported apparent overbilling by $20-30 / month.

Towards the end of December, following Christmas holidays, eWM has launched an investigation into this issue. In the first week of January, we have tracked down the issue to the change in the behavior of our SQL server following our server migration on October 26, 2015. Net effect of this change was a 24-hour shift of a fraction of 15-min intervals - e.g., charging data for Tue 3:00-3:15am interval were reported as Wed 3:00-3:15am interval.

The issue was then addressed via server-side fixes on January 8 & 9, with thorough testing during the following week.

Billing impact was largely contained due to high degree of similarity of the charging load for all days of the same type (e.g., weekdays are similar to other weekdays and weekends - to other weekends):

  1. For Mon charging load (peaking 12am - 3am, reported as Tue load), no significant impact due to Tue actual load occurring at the same time of night and generally being higher than Mon load.

  2. For Tue-Fri charging loads (peaking 12am-3am, reported as Wed - Sat load), no significant impact due to very similar load patterns for these days with respect to the next day's load. We estimate the impact at the 10-15% level due to occasional mismatches

  3. For Sat charging load, there was no significant impact since Sat and Sun charging loads are quite similar, as well. We estimate the impact at the 10-15% level due to occasional mismatches

  4. However, any Sun daytime charging load (reported as Mon daytime load) most likely got rejected as bad data and the energy got booked into the house load instead. Fortunately, Sun charging loads are typically only ~7-10% of the weekly load so the impact was limited to that level

Therefore, our assessment of the total impact for affected customers is 10-15% of 90% of the charging load (Mon-Sat) plus 7-10% of the weekly load that fell on Sun, for the total impact of 16-24%.

UPDATE May 2016:
Since our email notification to all pilot participant, ~25 customers reported potential discrepancies in their bills for Nov / Dec 2015. For every such report, we have completed a thorough investigation using the customer billing data (provided by customers) and our archived second-by-second submetering data. The resulting reimbursements were calculated to average at $23.04 for the period of two months in Nov / Dec 2015.  

This JuiceBox Hero Program Agreement (as amended from time to time, the “Agreement”), is between Electric Motor Werks, Inc. (“eMotorWerks,” “we,” “our”), with offices located at 846 Bransten Rd, San Carlos, CA 94070 and you (“you,” “your,” “Referral Member”). The Program is administered by eMotorWerks.

This Agreement governs your participation in the JuiceBox Hero Program (the “Program”). By making a referral using your Hero ID (as defined below) and/or accepting payment of any Referral Fee (as defined below), you indicate your acceptance of this Agreement and agree to all of its terms and conditions. You also agree that we may use and disclose your personal information as described in this Agreement and in our Privacy Policy located at http://emotorwerks.com/privacy-policy as it may change from time to time. No purchase is required to participate in the Program.

If you do not consent to this Agreement, including all of its terms and conditions, you will not be part of the Program and will not be paid or owed any Referral Fees. You may also contact us using the contact information in Section 18 Notices of this Agreement to inform us at any time that you do not wish to participate in the JuiceBox Hero Program (the “Program”), or that you wish to withdraw your participation in the Program.

    1. Participation Requirements and Obligations. In order to participate in the Program, you must:
        1. Be at least 18 years of age.
        2. Be a U.S. citizen or have the right to legally work in the United States.
        3. Provide eMotorWerks with your current email address, telephone number and mailing address.
        4. Provide eMotorWerks with a completed IRS Form W-9.

      Additionally, you agree and represent that:

      1. eMotorWerks may issue an IRS Form 1099 reflecting the value of the Referral Fees you received during the tax year in which they were received.
      2. You are solely responsible for, and will pay, any and all taxes applicable to the Referral Fees you receive from eMotorWerks.
      3. You are solely responsible for any expenses you incur in connection with your performance under this Agreement and participation in the Program.
      4. You will not spam anyone in relation to the Program or eMotorWerks and its products and services. If you provide a Hero ID to a third party by email, the email must be created and distributed in a personal manner that is appropriate and customary for communications with friends, colleagues and family members. Bulk email distribution, distribution to strangers, or any other promotion of a Hero ID in a manner that would constitute or appear to constitute unsolicited commercial email or “spam” in eMotorWerks’s sole judgment is expressly prohibited.
      5. To the extent that you are providing personal information of a third-party (e.g., name, email address and/or phone number), you agree that you will obtain express consent from such third-party, and further represent to eMotorWerks that you have the legal right, to provide such information to eMotorWerks and for eMotorWerks to contact such third-party for its marketing purposes.
      6. If you make reference to eMotorWerks on a website, Facebook page, Twitter account or any other web enabled or online advertising platform (the “Internet”), you represent to eMotorWerks that you own all of the content on such platform or otherwise have all rights necessary to present any content on such platform.
      7. You will not state or imply that you are acting on behalf of eMotorWerks, or are employed by eMotorWerks. eMotorWerks shall in its sole discretion make the determination as to whether and pursuant to what terms it will contract with a prospective customer and will manage all day to day details and relationships with such individuals.
      8. You will not make any unauthorized, false, deceptive or misleading statements or representations regarding eMotorWerks or its products or services to anyone. Under no circumstances shall you make representations or promises of any kind on behalf of eMotorWerks or regarding eMotorWerks that differ from or exceed those contained in the materials eMotorWerks provides to you.
      9. You will not incur expenses, sign contracts or have detailed discussions about eMotorWerks electric vehicle supply equipment (“EVSE System”) sales, design, financing, installation or maintenance.
      10. You will not defame, libel or slander anyone in connection with your participation in the Program.
      11. You will not promote eMotorWerks or the Program through any Internet site that contains pornography, obscenity, hateful or derogatory speech or is otherwise inappropriate in eMotorWerks’s sole judgment.
      12. You will not engage, or attempt to engage, in any act or omission that is or may be detrimental to or conflict with eMotorWerks’s mission, image or reputation, as determined in eMotorWerks’s sole judgment.
      13. You will not attempt to undermine the fairness, integrity or legitimate operation of the Program in any way by engaging, or attempting to engage, in cheating, hacking, fraud, deception, or any other unfair practices.
      14. You will not attempt to annoy, abuse, threaten or harass any other persons in connection your participation in the Program.
      15. You will not create multiple or fake emails addresses or accounts, use fictitious identities or use any system, bot or other device or artifice to participate in the Program or receive Referral Fees.
    2. Referral Fees; Payment Terms; Exclusions. You will be provided with a personal referral code (“Hero ID”) that allows you to receive referral fees (“Referral Fee”) for:
      1. Qualifying Referrals equal to 2% of the purchase price of an eMotorWerks EVSE System excluding any associated installation and permitting costs, software, other hardware costs, discounts, shipping and handling fees, and taxes.
      2. Qualifying Online Purchases equal to 6% of the purchase price of an eMotorWerks EVSE System excluding any associated installation and permitting costs, software, other hardware costs, discounts, shipping and handling fees, and taxes.
    3. eMotorWerks reserves the right to substitute the above Referral Fees with another referral fee of equal or greater value, in any form, without notice to you.
    4. Definition of Qualifying Referrals; Qualifying Online Purchases.
      1. A Qualifying Referral means a recipient of an official estimate from us to purchase an EVSE System (an “Estimate”):
        1. who requests an Estimate using your Hero ID;
        2. who signs a contract with eMotorWerks to purchase an EVSE System of $5,000 or more within six months of requesting an Estimate;
        3. whose eMotorWerks EVSE system has been successfully installed and interconnected to the electrical grid;
        4. who has never previously requested an Estimate; and
        5. with who we have never previously established contact to discuss the purchase of an EVSE System.
      2. b. A Qualifying Online Purchase means the purchase of an eMotorWerks EVSE System conducted through the eMotorWerks online webstore (currently located at: http://emotorwerks.com/store-juicebox-ev-charging-stations) by a buyer that:
        1. first arrives at our webstore via a unique link containing your Hero ID (“Hero Link”), and
        2. purchases said EVSE System within 30 days of last clicking on the Hero Link;
        3. was conducted entirely online through the webstore; and
        4. was not the subject of a previously requested Estimate.
    5. Notwithstanding the foregoing, in all cases, eMotorWerks reserves the right not to pay a Referral Fee with respect to any recipient who would otherwise be a Qualifying Referral if eMotorWerks is already bound to pay a referral fee of any sort to any third party or if the recipient requests that his or her Estimate or sale be tagged with a third party’s referral or tracking code and referrals of yourself or any family member residing with you. Referral Fees cannot be shared between Referral Members or combined with any other eMotorWerks offers or promotions.
    6. If Referral Fees are in the form of a gift card, the gift card may not be redeemed for cash and may be subject to additional terms and conditions of the issuer of the gift card. eMotorWerks shall pay to you any Referral Fees earned within 8-10 weeks following the date that the EVSE System associated with a Qualifying Referral is fully operational and successfully interconnected to the electrical grid, and paid in good standing to eMotorWerks. Such payment shall be made using the then-current contact information associated with your eMotorWerks account. eMotorWerks is not responsible for lost, misplaced, damaged, misdirected or stolen Referral Fees.
    7. Termination. You may withdraw your participation in the Program at any time for any reason immediately upon written notice to us. Your Participation in the Program is at eMotorWerks’s sole discretion. eMotorWerks may terminate your participation in the Program or the Program itself, including any portion thereof, and/or refuse payment of any Referral Fee for any reason or for no reason, at any time, immediately upon written notice to you. Without limiting the foregoing, eMotorWerks reserves the right to terminate your participation in the Program in the event you engage, threaten to engage or, in the past, have engaged, in any activity that may affect eMotorWerks, its reputation or standing in the community, as determined in eMotorWerks’s sole discretion, including having been convicted of any offense other than a minor traffic violation. If eMotorWerks terminates your participation in the Program, the Program itself, or any portion thereof, for any reason, you agree that you forfeit any Referral Fees not already received as of the date of such termination.
    8. Modifications. eMotorWerks may modify or amend this Agreement, and any part of the Program, including the methods by which Referral Fees are earned and paid, the amounts of Referral Fees and any requirements to receive such Referral Fee, at any time for any reason. Except as otherwise provided herein, eMotorWerks shall provide you with written notice of any such modifications or amendments. You may not modify this Agreement without eMotorWerks’s prior written consent.
    9. Trademark License. During your participation in the Program, eMotorWerks grants you a nonexclusive, nontransferable, personal right to use the trademarks, logos and program marketing assets made available by eMotorWerks solely for purposes of carrying out Program activities pursuant to the terms and conditions of this Agreement (the “Trademarks”). Neither this Agreement nor any relationship you may have with eMotorWerks grants to you any right, title, or interest in the Trademarks other than the rights specifically granted in this Section. You shall not use the Trademarks, or any part thereof, as part of your name or identity nor use any name or mark confusingly similar to the Trademarks, or otherwise utilize the Trademarks in a manner inconsistent with this Agreement. By participating in the Program, you agree to use the Trademarks in accordance with eMotorWerks's Trademark guidelines as such may be provided by eMotorWerks from time to time (the “Guidelines”). In addition to complying with the Guidelines, you agree: (i) not to alter or modify the Trademarks in any way; (ii) that the Trademarks will not be used as a design element of any other logo or trademark; (iii) not to use Trademarks in any manner that might disparage or injure eMotorWerks's reputation; (iv) that use of Trademarks will be truthful and not misleading; (v) not to use the Trademarks in a manner which, in eMotorWerks's sole discretion, diminishes or otherwise damages eMotorWerks's goodwill in the Trademarks. You shall use the following legend in any location on which Trademarks or other legal notices appear unless a different legend is required: “Trademark(s) are the trademarks or registered trademarks of eMotorWerks and its subsidiaries located in the United States and abroad.” eMotorWerks reserves the right to modify or terminate any rights arising out of or in connection with this Section, in whole or in part, without cause, at its sole discretion at any time. If you cease participation in the Program or are terminated from the Program, you will immediately cease use of all Trademarks and any other marks or materials of or provided by eMotorWerks.
    10. Search Engine Marketing and Online Advertising Guidelines. You agree not to bid on the Trademarks and certain other terms for search marketing campaigns and pay-per-click campaigns. These terms can be found in the list of prohibited keywords attached to this Agreement as Exhibit A. eMotorWerks may amend this list from time to time. Please note this prohibition applies to all search engines large and small including, but not limited to, Google, Yahoo, Bing, and AOL. eMotorWerks prohibits the use of, and you agree not to use the words “coupon,” “cheap,” and “discount” in paid advertisements. You are further prohibited from registering your Hero ID on coupon or EVSE aggregator websites such as coupons.com. You may not use “www.emotowerks.com” (or any variation thereof) as the display URL in any search engine or like marketing campaign. In addition, you cannot have eMotorWerks in the main portion of your URL address. For example, you may use www.buyevchargingstations.com/emotorwerks; however, you may not use www.buyemotorwerkschargingstations.com. eMotorWerks prohibits Referral Members from using any eMotorWerks trademarks, including but not limited to “JuiceBox”, “JuiceNet”, “JuiceCord” and eMotorWerks’s product names in the main URL or sub-domain, except for those specifically provided to you by eMotorWerks. eMotorWerks may provide Referral Members with tools such as logos, online banners and other creative assets. Referral Members may not modify these materials in any way without eMotorWerks's express written prior consent. Use of these materials is subject to the license granted by this Agreement. eMotorWerks prohibits the usage of banner and paid advertising.
    11. Personal Information. Participation in the Program may require you to submit personal information about yourself and others (collectively “Users”), such as your and their names and email addresses. This information will be collected, processed, disclosed and used in accordance with eMotorWerks’s Privacy Policy, which can be found at http://emotorwerks.com/privacy-policy. In addition, information may be used by eMotorWerks to contact Users with regards to participation in the Program and to receive communications from eMotorWerks.
    12. Use of Websites and Applications. eMotorWerks may, in its sole discretion, provide you with a unique and personal log-in to a referral portal to check the status of your Qualifying Referrals and to manage your account. Your use of our sites and applications are subject terms and conditions located at http://www.emotorwerks.com/terms-and-conditions.
    13. Indemnity. You agree to defend, indemnify and hold eMotorWerks, its affiliates, and each of their respective officers, directors, shareholders, affiliates, employees and agents (each an “Indemnitee”) harmless from and against any and all third party claims, actions, losses, damages, liability, costs and expenses (including, without limitation, reasonable attorneys' fees and disbursements incurred by an Indemnitee in any action) arising out of or in connection with your breach of any of the representations, warranties or obligations set forth in this Agreement.
    16. Confidentiality. “Confidential Information” means:(a) any information disclosed by eMotorWerks, either directly or indirectly, in writing, orally or by inspection of tangible objects, which is designated as “confidential,” “proprietary” or some similar designation (collectively, the “Disclosed Materials”) or
    17. should reasonably be understood to be confidential; and (b) any information otherwise obtained, directly or indirectly, by you through inspection, review or analysis of the Disclosed Materials. Confidential Information shall not include information that: (a) is or becomes part of the public domain through no action or omission of you; (b) becomes available to you from a third party that is not known to be in breach of any contractual, legal or fiduciary obligation of confidentiality; or (c) was rightfully in your possession prior to the date of disclosure. You will maintain in confidence and not disclose or disseminate to any third party, or use, except as explicitly permitted herein, any Confidential Information. Title to and ownership of all Confidential Information, including all systems, software (including any modifications, enhancements and updates), documentation, tools, utilities, methodologies, specifications, techniques and other materials, know-how and hardware owned by eMotorWerks shall remain the property of eMotorWerks.
    18. Notices. Any notice required or permitted to be given under this Agreement shall be given in writing and shall be deemed effectively given (a) upon transmission by email; (b) upon personal delivery; (c) two business days after deposit with a nationally recognized overnight delivery service; or (d) five business days after mailing via registered or certified mail, postage prepaid, return receipt requested. All notices shall be delivered to Referral Member using the then-current contact information associated with such Referral Member’s account. All notices shall be delivered to eMotorWerks at the following:

eMotorWerks, Inc. Attn: JuiceBox Hero Program 846 Bransten Rd San Carlos, CA 94070 Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

  1. General. This Agreement is governed by California law without giving effect to conflict of laws principles. The jurisdiction and venue for all disputes arising out of this Agreement shall be in San Mateo County, California. Any and all disputes arising out of or relating to this Agreement shall be arbitrated before either of the American Arbitration Association or JAMS under the applicable business dispute rules of such administering organization. eMotorWerks's relationship with you is that of an independent contractor, and nothing in this Agreement should be construed to create a partnership, agency, joint venture or employment relationship. Each party shall deem a document faxed or scanned to it as an original document. If any provision of this Agreement is found unenforceable or invalid, such unenforceability or invalidity shall not render this Agreement unenforceable or invalid as a whole. In such event, such provision shall be changed and interpreted so as to best accomplish the objectives of such unenforceable or invalid provision within the limits of applicable law. Provisions that should reasonably be considered to survive termination of this Agreement shall survive. The failure of either party to require performance by the other party of any provision hereof shall not affect the full right to require such performance at any time thereafter; nor shall the waiver by either party of a breach of any provision hereof be taken or held to be a waiver of the provision itself. Neither party shall be liable hereunder by reason of any failure or delay in the performance of its obligations hereunder (except for the payment of money) on account of strikes, shortages, riots, insurrection, fires, flood, storm, explosions, acts of God, war, governmental action, labor conditions, earthquakes, material shortages, or any other cause beyond the reasonable control of such party. You may not assign or transfer any rights under this Agreement without eMotorWerks's prior written consent. This Agreement completely and exclusively states the agreement of the parties regarding its subject matter and supersedes all prior proposals, agreements, or other communications between the parties, oral or written, regarding its subject matter.


You may not bid on the following keywords:

  1. juicebox
  2. juice box
  3. motor werks
  4. emotorwerks
  5. motorwerks
  6. juice
  7. box
  8. electric motor werks

Introducing JuicePlug
a Revolution in EV Charging!


We are extremely excited to launch the most innovative product to date in the EV charging industry - JuicePlug.

JuicePlug is a small, WiFi-connected adapter that attaches to your charging cable and transforms your existing charging station into the smartest station on the market, giving you full anytime / anywhere control, saving you money, and reducing emissions from your charging. JuicePlug requires no tools or assembly, takes 10 seconds to plug in, and is compatible with all EVs and EVSEs on the market.

This new product is the result of our success over the last 2 years of bringing the most innovative and smart EV charging solutions to the market. We launched this product through the Kickstarter crowdfunding site and it's now available for order in our store. Order your JuicePlug today and help us bring the new energy future to everyone! 

                             JP render front angle white


Our Charging Systems


  • Our DC Chargers can be configured for up to 600V 3-phase input AC power and up to 900VDC input DC power and can be configured for up to 800VDC battery voltage 
  • SmartCharge-12000 can now be controlled remotely via serial UART port.
  • Our chargers can  be used to charge CHAdeMO vehicles via our standalone CHAdeMO controller and CHAdeMO cable and plug
  • We provide Assembly Manual videos for our DC Charging Systems in Full HD - along with a new set of Build Materials (80 pages with detailed photos and instructions)! Scroll down to the bottom of the page for all details.

Here is a reference table. Many of these can be further customized and we always are working on the new products so if you don't see what you are looking for below - just ask!

ParameterSmartCharge-12000QuickCharge-25000 LVQuickCharge-25000 HV
Input Voltage - AC 100VAC to 260VAC single phase (standard); up to 600VAC 3-phase as option  260VAC to 480VAC three phase (standard); up to 600VAC 3-phase as option  100VAC to 260VAC three phase (standard); up to 600VAC 3-phase as option 
Input Voltage - DC from 100VDC to 425VDC (Standard); up to 800VDC as option
Input Current up to 50A RMS up to 100A RMS up to 80A RMS
Output Current up to 70A (standard); up to 100A as option up to 100A up to 70A up to 60A
Output Power up to 12kW up to 25kW up to 20kW
Output Voltage 12VDC - 350VDC (standard); up to 800V as option 12VDC to 270VDC (standard, from 240VAC single-phase input); up to 750VDC as option (from 600V 3-phase) - see note #4 below 340VDC to 450VDC (standard); up to 800V as option - see note #5 below 280-410VDC (standard), other ranges available as option
Input / Output termination AWG6 + Anderson SB50  AWG2 + Anderson SB175  Input: AWG2 + Anderson SB175; Output: AWG6 + Anderson SB50
Charger control Automatic pre-programmed charge profile, LCD + buttons manual control, automatic Serial UART control, CHAdeMO (with optional controller)
Topology Boost + Buck Buck Boost Boost + Asymmetric Half-Bridge
PFC YES (on single-phase input only) NO YES (on single-phase input only) YES (on single-phase input only)
Galvanic isolation NO NO NO YES
Weight, lbs 20 20 20 30
Dimensions, inch 11x11x8 15x11x8 15x11x8 18x11x8
Volume, cubic inch ~1,000 ~1,400 ~1,400 ~1,600
Power density, W/in^3 12 18 18 13
Pricing ~$2,000 ~$3,000 ~$4,000

We realize that it still can be a bit confusing to figure out how much power you would really get from this or that version so here are a couple of examples from actual customer orders:

  1. An EV Conversion with a 120V battery pack. SmartCharge-12000 output in this case will be limited by the max output current of 70A (in the standard build), or ~8.4kW
  2. A 25kW CHAdeMO charger with 3-phase 415V input designed to charge a Nissan Leaf. The input peak voltage is 415V * 1.4 = ~600V. Nissan Leaf pack peak voltage is ~400V. Therefore, the right charger choice is QuickCharge-25000 LV. The output power will be limited to max power rating of 25kw since neither input current limit (100A, or ~65kW) nor output current limit (100A, or ~40kW) would be a factor.
  3. At this point, we do not offer a 3-phase PFC product. While this version is in the active development, we expect at least 3-6 months before it becomes available.
  4. For QuickCharge-25000 LV, upper limit on output votage can be calculated as [peak input phase-to-phase voltage MINUS 70V]. In case of DC input peak = average. In case of AC input, peak = 1.4 * RMW phase-to-phase voltage.  
  5. For QuickCharge-25000 HV, lower limit on output voltage is equal to the peak input voltage. For DC, this = input voltage. For AC, this = 1.4 * input RMS phase-to-phase voltage

More details on SmartCharge-xxxxx features

SmartCharge-12000 - a fully programmable, open-source (for non-commercial use) 12-15kW intelligent PFC charger. We take orders for bare PCBs, parts kits, partially assembled units, and fully assembled and tested units.

Specs - see table above


Control methods:

  • Manual - charger can be programmed for any input / output current / voltage at any time in field - no need to do any factory setting!
  • Automatic:
    • J1772 support with automatic power regulation (charger reads and interprets the J1772 pilot signal & limits max power draw to the one suggested by the EVSE)
    • Serial control now available for fully automatic operation. Multiple chargers can be run in parallel, controlled by one simple head unit

Additional features:

  • BMS stop-charge TTL input
  • End-of-Charge TTL output
  • Hardware current limiting
  • Thermal output derating above 55C heatsink temperature
  • Inductor temperature sensing
  • Flexible battery settings: set number of batteries, capacity through a simple-to-use interface

Next steps / future versions

  • Add real time clock for time-of-day charge control - now implemented as a part of the JuiceBox - Open Source 15kW Level 2 EVSE.
  • Implement CANbus control (serial has already been implemented as of August 2013)
  • Implement fast charge communication protocol for Nissan Leaf - COMPLETE - see CHAdeMO controller product in our store
  • Develop a 3-phase high-voltage version (up to 600V 3-phase) - NON-PFC version COMPLETE, PFC version development ongoing now  

For more information and for potential distribution / partnership opportunities around our charger design, please contact us at infoThis email address is being protected from spambots. You need JavaScript enabled to view it.

Let us know what you think. Any comments welcome!

There is also a lot more cool content on our YouTube channel page - check it out for some inspiration on what's possible!



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