[Ovmsdev] Prolonging traction battery life feature

[Mark Webb-Johnson]

I think overall, it should be a goal of the scripting system to be able to cope with scenarios/requirements like this.

> 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.

This was my concern. I used to use ACC to maintain my battery, but it seemed to go out of balance when stopping charge below 100% (standard mode).

Regards, Mark.

> On 16 Feb 2018, at 11:19 AM, Tom Saxton <tom at idleloop.com> wrote:
> 
> Hi Robert,
>  
> 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.
>  
> In OVMS v2 this was configured via text message. For example this command:
>  
> ACC PARAMS CHARGEBY 07:00 STOPSOC 60
>  
> 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.
>  
> 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.
>  
> 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.
>  
>      Tom
>  
> From: <ovmsdev-bounces at lists.teslaclub.hk <mailto:ovmsdev-bounces at lists.teslaclub.hk>> on behalf of Robert Sharpe <robert.sharpe at evergreen-consulting.co.uk <mailto:robert.sharpe at evergreen-consulting.co.uk>>
> Reply-To: OVMS Developers <ovmsdev at lists.teslaclub.hk <mailto:ovmsdev at lists.teslaclub.hk>>
> Date: Thursday, February 15, 2018 at 9:13 AM
> To: OVMS Developers <ovmsdev at lists.teslaclub.hk <mailto:ovmsdev at lists.teslaclub.hk>>
> Subject: [Ovmsdev] Prolonging traction battery life feature
>  
> Hi All, <>
>  
> I have an idea that will help prolong the life of EV batteries and maximise vehicle resale value.
>  
> 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
> ·         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
> ·         the OVMS will be told the minimum required soc and when this should be achieved
> ·         it will then wait until the last moment to start charging to achieving the required min soc
> ·         a later version could receive a notification from your Google calendar with required mileage via IFTT, etc
> 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.
>  
> If this sounds interesting and you would like to find out more please feel free to get back to me for a chat.
>  
> Regards,
> Robert Sharpe (Managing Director)
> 07711 252971
> Skype: arsharpe
> 
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