[Ovmsdev] Cool down

[William Petefish]

Not enough incoming power.

William
On Jun 27, 2012 9:58 PM, "Mark Webb-Johnson" <mark at webb-johnson.net> wrote:

>
> Any idea why my tests are not showing the cooling affect at all, under
> low-current charges?
>
> Do I need to switch to range mode for the charge?
>
> Regards, Mark.
>
> On 28 Jun, 2012, at 10:36 AM, Tom Saxton wrote:
>
> The Tattler does a minimum current range mode charge which prioritizes
> cooling. It watches for the cooling to end, and actual charging to start,
> then kills the session. It does that process up to three times, or until
> the temperature threshold is reached.
>
> I generally used it to cool to 27C (80F).
>
>     Tom
>
> On Jun 27, 2012, at 6:40 PM, Mark Webb-Johnson <mark at webb-johnson.net>
> wrote:
>
>
> I've been experimenting with cool down, but can't get it to work as I
> expect. For example, here are the results for a recent charge:
>
>
>    1. 7:15pm - Ambient: 30ºC, PEM: 37ºC, MOTOR: 54ºC, BATTERY: 39ºC, SOC:
>    74%, IDEAL: 230km. Arrived home and plugged in (timer delayed charge, so
>    nothing happens).
>    2. 7:28pm - Ambient: 30ºC, PEM: 38ºC, MOTOR: 53ºC, BATTERY: 39ºC, SOC:
>    74%, IDEAL: 230km. Action: Force charge at 220V 10A.
>    3. 7:33pm - Ambient: 30ºC, PEM: 45ºC, MOTOR: 51ºC, BATTERY: 39ºC, SOC:
>    74%, IDEAL: 230km. Still charging 220V 10A.
>    4. 7:42pm - Ambient: 30ºC, PEM: 45ºC, MOTOR: 47ºC, BATTERY: 39ºC, SOC:
>    75%, IDEAL: 232km. Still charging 220V 10A.
>    5. 7:58pm - Ambient: 30ºC, PEM: 45ºC, MOTOR: 43ºC, BATTERY: 39ºC, SOC:
>    75%, IDEAL: 235km. Still charging 220V 10A.
>    6. 7:59pm - Ambient: 30ºC, PEM: 45ºC, MOTOR: 43ºC, BATTERY: 39ºC, SOC:
>    75%, IDEAL: 235km. Action: Increase charge current to 220V 24A.
>    7. 8:48pm - Ambient: 34ºC, PEM: 47ºC, MOTOR: 39ºC, BATTERY: 34ºC, SOC:
>    82%, IDEAL: 256km. Still charging 220V 24A.
>    8. 8:49pm - Ambient: 34ºC, PEM: 47ºC, MOTOR: 39ºC, BATTERY: 34ºC, SOC:
>    82%, IDEAL: 256km. Action: Increase charge current to 220V 48A.
>    9. 9:03pm - Ambient: 34ºC, PEM: 53ºC, MOTOR: 39ºC, BATTERY: 33ºC, SOC:
>    86%, IDEAL: 267km. Still charging 220V 48A.
>    10. 9:18pm - Ambient: 33ºC, PEM: 53ºC, MOTOR: 39ºC, BATTERY:
>    33ºC, SOC: 90%, IDEAL: 283km. Still charging 220V 48A.
>    11. 10:19pm - Ambient: 30ºC, PEM: 41ºC, MOTOR: 38ºC, BATTERY:
>    33ºC, SOC: 95%, IDEAL: 299km. Charge had completed (some minutes early) and
>    car was sleeping.
>
>
> Some comments:
>
>
>    - There was no appreciable change to the battery temperature (@39ºC)
>    when slow-charging at 220V 10A.
>    - Increasing charge rate to 220V 24A did seem to bring down battery
>    temperature (@34ºC).
>    - Increase in ambient temperature when charging @24A is most likely
>    due to the car being in the garage, and aircon dumping charging heat
>    raising ambient temperature in the garage.
>    - Between 7:28pm and 7:59pm, charging @10A, the charger put 5pm ideal
>    miles into the car, +7ºC on the ESS, but zero change to battery temperature.
>
>
> Is the battery @39ºC not hot enough for cool down to matter?
>
> Anyone know the default thresholds for Tattler, or anyone doing this
> manually and seen any affect?
>
> Regards, Mark.
>
> P.S. I'll try to drive a little more spirited, with the aircon off and
> performance mode engaged, on the drive home tonight, to see if I can bring
> up the temperatures to make the affect more pronounced. Forecast is for
> 33ºC ambient, and it'll be hotter than that in the city.
>
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