[Ovmsdev] Cool down

[Tom Saxton]

Yes, you need to switch into range mode to give cooling higher precedence
over charging.

The Tattler switches the mode to range, then restores the mode when done
cooling.

    Tom

on 6/27/12 7:58 PM, Mark Webb-Johnson 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:
>>> 
>>> 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).
>>> 7:28pm - Ambient: 30ºC, PEM: 38ºC, MOTOR: 53ºC, BATTERY: 39ºC, SOC: 74%,
>>> IDEAL: 230km. Action: Force charge at 220V 10A.
>>> 7:33pm - Ambient: 30ºC, PEM: 45ºC, MOTOR: 51ºC, BATTERY: 39ºC, SOC: 74%,
>>> IDEAL: 230km. Still charging 220V 10A.
>>> 7:42pm - Ambient: 30ºC, PEM: 45ºC, MOTOR: 47ºC, BATTERY: 39ºC, SOC: 75%,
>>> IDEAL: 232km. Still charging 220V 10A.
>>> 7:58pm - Ambient: 30ºC, PEM: 45ºC, MOTOR: 43ºC, BATTERY: 39ºC, SOC: 75%,
>>> IDEAL: 235km. Still charging 220V 10A.
>>> 7:59pm - Ambient: 30ºC, PEM: 45ºC, MOTOR: 43ºC, BATTERY: 39ºC, SOC: 75%,
>>> IDEAL: 235km. Action: Increase charge current to 220V 24A.
>>> 8:48pm - Ambient: 34ºC, PEM: 47ºC, MOTOR: 39ºC, BATTERY: 34ºC, SOC: 82%,
>>> IDEAL: 256km. Still charging 220V 24A.
>>> 8:49pm - Ambient: 34ºC, PEM: 47ºC, MOTOR: 39ºC, BATTERY: 34ºC, SOC: 82%,
>>> IDEAL: 256km. Action: Increase charge current to 220V 48A.
>>> 9:03pm - Ambient: 34ºC, PEM: 53ºC, MOTOR: 39ºC, BATTERY: 33ºC, SOC: 86%,
>>> IDEAL: 267km. Still charging 220V 48A.
>>> 9:18pm - Ambient: 33ºC, PEM: 53ºC, MOTOR: 39ºC, BATTERY: 33ºC, SOC: 90%,
>>> IDEAL: 283km. Still charging 220V 48A.
>>> 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.
>>> 
>>> _______________________________________________
>>> OvmsDev mailing list
>>> OvmsDev at lists.teslaclub.hk
>>> http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
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