<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta content="text/html;charset=UTF-8" http-equiv="Content-Type"></head><body ><div style='font-size:10pt;font-family:Verdana,Arial,Helvetica,sans-serif;'><div class="zmail_extra"><div id="1">Hi Tom,</div><div id="1"><br></div><div id="1">Thanks for your reply.</div><div id="1"><br></div><div id="1"><p class="MsoNormal">Just to clarify, all I am trying to do is to reproduce what manufacturers do all the time to prolong battery life when they supply Lithium batteries at 50% soc. If this charge scenario doesn't improve their life then nothing wasted. If it does then it could prolong its life by around 50% and save thousands of pounds on battery replacement.</p><p class="MsoNormal"><br></p><p class="MsoNormal">Before I think about about how to use OVMS to implement this, can someone summarise what current Nissan Leaf feature support is provided (which can then be used to update the <a href="https://www.openvehicles.com/vehiclesupport" target="_blank">vehicle support list</a>)</p></div><div id="1"><br></div><div id="1">Regards,</div><div id="1">Rob</div><div id="1"><br></div><div id="1">--- On Fri, 16 Feb 2018 03:19:59 +0000 <b>Tom Saxton <tom@idleloop.com></b> wrote ---- <br></div><blockquote style="border-left: 1px solid #0000FF;padding-left: 6px; margin: 0 0 0 5px"><meta><meta><div><div><p class="MsoNormal"><span style="font-size: 12pt">Hi Robert,</span></p><p class="MsoNormal"><span style="font-size: 12pt"> </span></p><p class="MsoNormal"><span style="font-size: 12pt">I believe most of what you want is already built into OVMS through the Advanced Charge Control feature, at least for vehicles that have implemented a charge time predictor.</span></p><p class="MsoNormal"><span style="font-size: 12pt"> </span></p><p class="MsoNormal"><span style="font-size: 12pt">In OVMS v2 this was configured via text message. For example this command:</span></p><p class="MsoNormal"><span style="font-size: 12pt"> </span></p><p class="MsoNormal"><span style="font-size: 12pt">ACC PARAMS CHARGEBY 07:00 STOPSOC 60</span></p><p class="MsoNormal"><span style="font-size: 12pt"> </span></p><p class="MsoNormal"><span style="font-size: 12pt">tells OVMS that when plugged in at the current location, it should delay charging until charging to 60% state-of-charge will be achieved around 7:00 am.</span></p><p class="MsoNormal"><span style="font-size: 12pt"> </span></p><p class="MsoNormal"><span style="font-size: 12pt">As far as I know, there isn’t currently a notion of a minimum SOC that should be achieved ASAP upon plug in. I’m not sure that’s a big deal unless you regularly plug in with SOC below 10%. For example, the Tesla Roadster has a storage mode that holds charge at around 25% for long term storage.</span></p><p class="MsoNormal"><span style="font-size: 12pt"> </span></p><p class="MsoNormal"><span style="font-size: 12pt">There is a possible downside with using OVMS to limit the state of charge. Some electric vehicles, perhaps most, perform a pack leveling operation at the end of charging. If OVMS is used to stop charging early, that pack leveling will not happen.</span></p><p class="MsoNormal"><span style="font-size: 12pt"> </span></p><p class="MsoNormal"><span style="font-size: 12pt"> Tom</span></p><p class="MsoNormal"><span style="font-size: 12pt"> </span></p><div style="border: none; border-top: solid rgb(181, 196, 223) 1pt; padding: 3pt 0in 0in 0in"><p class="MsoNormal" style="margin-left: 0.5in"><b><span style="font-size: 12pt; color: black">From: </span></b><span style="font-size: 12pt; color: black"><<a href="mailto:ovmsdev-bounces@lists.teslaclub.hk" target="_blank">ovmsdev-bounces@lists.teslaclub.hk</a>> on behalf of Robert Sharpe <<a href="mailto:robert.sharpe@evergreen-consulting.co.uk" target="_blank">robert.sharpe@evergreen-consulting.co.uk</a>><br><b>Reply-To: </b>OVMS Developers <<a href="mailto:ovmsdev@lists.teslaclub.hk" target="_blank">ovmsdev@lists.teslaclub.hk</a>><br><b>Date: </b>Thursday, February 15, 2018 at 9:13 AM<br><b>To: </b>OVMS Developers <<a href="mailto:ovmsdev@lists.teslaclub.hk" target="_blank">ovmsdev@lists.teslaclub.hk</a>><br><b>Subject: </b>[Ovmsdev] Prolonging traction battery life feature</span></p></div><div><p class="MsoNormal" style="margin-left: 0.5in"> </p></div><div><div><p class="MsoNormal" style="margin-left: 0.5in"><a name="_MailOriginalBody"><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"="">Hi All,</span></a></p></div><div><p class="MsoNormal" style="margin-left: 0.5in"><span style=""><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"=""> </span></span></p></div><div><p class="MsoNormal" style="margin-left: 0.5in"><span style=""><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"="">I have an idea that will help prolong the life of EV batteries and maximise vehicle resale value.</span></span></p></div><div><p class="MsoNormal" style="margin-left: 0.5in"><span style=""><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"=""> </span></span></p></div><div><p class="MsoNormal" style="margin-left: 0.5in"><span style=""><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"="">In summary it involves implementing intelligent charging that keeps the battery at 50% (the best soc for long term storage) for as long a possible and minimises depth of charge and discharge. For example</span></span></p></div><div><p class="MsoNormal" style="margin-left: 1in; text-indent: -0.25in"><span style=""><span style="font-size: 10pt; font-family: Symbol"><span style="">·<span style="font: 7pt " times="" new="" roman""=""> </span></span></span><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"="">as soon as you get to a charge point (eg home or work), the OVMS will detect if it is below 50% and charge it until 50% is achieved</span></span></p><p class="MsoNormal" style="margin-left: 1in; text-indent: -0.25in"><span style=""><span style="font-size: 10pt; font-family: Symbol"><span style="">·<span style="font: 7pt " times="" new="" roman""=""> </span></span></span><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"="">the OVMS will be told the minimum required soc and when this should be achieved</span></span></p><p class="MsoNormal" style="margin-left: 1in; text-indent: -0.25in"><span style=""><span style="font-size: 10pt; font-family: Symbol"><span style="">·<span style="font: 7pt " times="" new="" roman""=""> </span></span></span><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"="">it will then wait until the last moment to start charging to achieving the required min soc</span></span></p><p class="MsoNormal" style="margin-left: 1in; text-indent: -0.25in"><span style=""><span style="font-size: 10pt; font-family: Symbol"><span style="">·<span style="font: 7pt " times="" new="" roman""=""> </span></span></span><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"="">a later version could receive a notification from your Google calendar with required mileage via IFTT, etc</span></span></p></div><div><p class="MsoNormal" style="margin-left: 0.5in"><span style=""><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"="">Unfortunately, I don't have the coding skills to implement it but would be happy to do all the non-coding stuff like requirements, design, documentation, testing, etc.</span></span></p></div><div><p class="MsoNormal" style="margin-left: 0.5in"><span style=""><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"=""> </span></span></p></div><div><p class="MsoNormal" style="margin-left: 0.5in"><span style=""><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"="">If this sounds interesting and you would like to find out more please feel free to get back to me for a chat.</span></span></p></div><div><p class="MsoNormal" style="margin-left: 0.5in"><span style=""><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"=""> </span></span></p><div><div><div><p style="margin-left: 0.5in; background: white"><span style=""><span style="font-size: 12pt">Regards,<br>Robert Sharpe (Managing Director)<br>07711 252971<br></span></span><span style=""><span style="font-size: 13.5pt">Skype: arsharpe</span></span><span style=""><span style="font-size: 10pt; font-family: " verdana",="" sans-serif"=""></span></span></p><p style="margin-left: 0.5in; background: white"><span style=""></span><a href="http://www.linkedin.com/in/arsharpe" target="_blank"><span style=""><span style="font-size: 10pt; 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