[Ovmsdev] Leaf charge time estimates

[Mark Webb-Johnson]

There was some discussion regarding this, that we never resolved. Perhaps a good time to finalise a unified approach for this?

To avoid metric bloat, we could perhaps use OvmsMetricSet to store different estimates for different kW ratings?

Regards, Mark.

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From: Michael Balzer <dexter at expeedo.de>
Subject: Re: [Ovmsdev] Charge time prediction
Date: Thu, 17 May 2018 08:14:00 +0200
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> On 24 Feb 2019, at 10:45 PM, Robin O'Leary <ovmsdev at caederus.org> wrote:
> 
> https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/pull/207
> 
> This adds support for 6 metrics ("xnl.v.c.duration....") reporting the
> Leaf BMS's time estimates in minutes for various hypothetical charging
> conditions:
> 
> 	* to 100% charge (".full")
> 	* to  80% charge (".range")
> 
> 	* with power ~1.6kW (".l0")
> 	* with power ~3.3kW (".l1")
> 	* with power ~6.7kW (".l2")
> 
> I find them useful, although they don't seem to fit in the existing OVMS
> charge reporting framework, which expects an on-going charge before it
> calculates any estimate.
> 
> They may also help us reverse-engineer whether the BMS expects temperature,
> cell state, tapering near full, etc. to affect the duration, if we want
> to make our own time estimation algotithm,
> 
> On my Leaf (which has the 6.6kW charger), the dash display normally shows
> two charge time estimates: at 3.3kW power ("xnl.v.c.duration.full.l1")
> and at 6.6kW power ("xnl.v.c.duration.full.l2").  My model has the option
> for "Long life battery mode"; when this is enabled, it instead shows the
> values to 80% ("xnl.v.c.duration.range.l1", "xnl.v.c.duration.range.l2").
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