[Ovmsdev] Prolonging traction battery life feature

[Tom Saxton]

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> on behalf of Robert Sharpe <robert.sharpe at evergreen-consulting.co.uk>
Reply-To: OVMS Developers <ovmsdev at lists.teslaclub.hk>
Date: Thursday, February 15, 2018 at 9:13 AM
To: OVMS Developers <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

    

 

Your Plugged-in Partner

Evergreen Consulting is the trading name of Sharpe Consultants Ltd


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