[Ovmsdev] 12V battery alerts

Thomas Bergo thomas.bergo at gmail.com
Wed Oct 30 18:17:29 HKT 2013


Just a comment, for the i-Miev we don't have the ambient temperature
available.
So for now we need a static diff that is grater then 1.5V

Regards, Thomas



2013/10/30 Rolf Welde Skeie <rwskeie at gmail.com>

> Somehow I feel a few fingers pointing my way.. :)
> I can have a go, but do not have time until sometime next week.
>
> The algorithm I envision goes something like this:
>
> cold_lim = 10; // celcius that is..
> batt_diff = 2; // max difference between charged and non-charged
> batt_definitely_low = 12;  // definite low level limit
> volts_per_degree = 0.05;
>
> // add cold weather component
> if (env_temp < cold_lim) {
>   batt_diff += (cold_lim - env_temp)*volts_per_degree;
> }
>
> if ((batt_now < batt_definitely_low) || ((batt_charged - batt_now) >
> batt_diff))) {
>   alarm_low();
> } else {
>   alarm_cleared();
> }
>
> Any thoughts?
>
> Actually we should probably look at the server logs and create some
> statistics to measured correlated 'batt_now' and 'env_temp' to properly
> calibrate 'volts_per_degree'. Also look at peak highs and lows to see how
> the batteries out there are performing :)
>
> Regards
>   Rolf
>
>
>
> On 10/30/2013 12:54 AM, Mark Webb-Johnson wrote:
>
>>
>> Can someone try it at 2.0V (rather than 1.5V) and see if it solves the
>> false-alerts problem?
>>
>> Regards, Mark.
>>
>> On 29 Oct, 2013, at 5:10 pm, Rolf Welde Skeie <rwskeie at gmail.com> wrote:
>>
>>  Ok, it seems like a few have similar issues.
>>> The logic behind the calculations seems to be reasonable, it is the
>>> assumption that there is a 1.5V difference between charging/non-charging
>>> state which is not generally applicable.
>>>  From my observations it seems like increasing this to 2.0V would take
>>> care of most mis-firing events.?..
>>>
>>> Disclaimer: I'm not an expert on batteries...
>>>
>>> Running on 2.5.5 experimental/TC
>>>
>>> Rolf
>>>
>>> On 10/29/2013 10:00 AM, Matt Beard OVMS wrote:
>>>
>>>> Yup, I also get this message and it would be great if it were working
>>>> properly, but it actually fires at 13.1V which is far too high.
>>>>
>>>> Matt
>>>>
>>>>
>>>>
>>>> On 29 October 2013 08:46, Rolf Welde Skeie <rwskeie at gmail.com
>>>> <mailto:rwskeie at gmail.com>> wrote:
>>>>
>>>>     I have the following features set:
>>>>     #0=1, #8=1, #9=1, #15=1, all others =0.
>>>>
>>>>     Can't remember which one made it work, but one of them did, my guess
>>>>     would be #9 :)
>>>>
>>>>     Rolf
>>>>
>>>>
>>>>     On 10/29/2013 09:38 AM, Håkon Markussen wrote:
>>>>
>>>>         I never get this alert.
>>>>         I have a Think City (as Rolf Skeie) and use the iOS-app.
>>>>         I have tested on both an exhausted aux-battery and on a brand
>>>> new
>>>>         battery in perfect condition.
>>>>
>>>>         Br.
>>>>         Håkon
>>>>
>>>>
>>>>         2013/10/29 Thomas Bergo <thomas.bergo at gmail.com
>>>>         <mailto:thomas.bergo at gmail.com**>
>>>>         <mailto:thomas.bergo at gmail.com <mailto:thomas.bergo at gmail.com**
>>>> >__>>
>>>>
>>>>
>>>>              I'm also get this alert.
>>>>
>>>>              Regard, Thomas
>>>>
>>>>              tirsdag 29. oktober 2013 skrev Rolf Welde Skeie følgende:
>>>>
>>>>                  Hi,
>>>>
>>>>                  I'm getting 12V battery alerts ala:
>>>>                  "MP-0 PAALERT!!! 12V BATTERY CRITICAL (13.2V,
>>>> ref=14.7V)"
>>>>
>>>>                  So the 1.5V hardcoded difference between charged and
>>>>         non-charged
>>>>                  state seems to be too low. The battery is working just
>>>>         fine and
>>>>                  has been tested without any issues, but seems to
>>>>         stabilize at
>>>>                  approx. 12.8V.
>>>>
>>>>                  Is this a global issue; are others experiencing this as
>>>>         well?
>>>>
>>>>                  If this is a issue only relevant to my car: would it
>>>>         make sense
>>>>                  to allow for controlling some of these kind of values
>>>>         through
>>>>                  parameters?
>>>>
>>>>                  BTW, I believe the Think City module could be put in
>>>> the
>>>>                  production builds, it seems to be working fine.
>>>>
>>>>                  Best regards
>>>>                  --
>>>>                  Rolf Welde Skeie
>>>>                  Solåsen 27, 5223 Nesttun, Norway
>>>>         +47 92403016 <tel:%2B47%2092403016> <tel:%2B47%2092403016> /
>>>>         rwskeie at gmail.com <mailto:rwskeie at gmail.com>
>>>>                  ______________________________**_____________________
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>>>> >
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>>>>
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>>>> >>
>>>>
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>>>>
>>>>     --
>>>>     Rolf Welde Skeie
>>>>     Solåsen 27, 5223 Nesttun, Norway
>>>>     +47 92403016 <tel:%2B47%2092403016> / rwskeie at gmail.com
>>>>     <mailto:rwskeie at gmail.com>
>>>>     ______________________________**___________________
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>>>>
>>> --
>>> Rolf Welde Skeie
>>> Solåsen 27, 5223 Nesttun, Norway
>>> +47 92403016 / rwskeie at gmail.com
>>> ______________________________**_________________
>>> OvmsDev mailing list
>>> OvmsDev at lists.teslaclub.hk
>>> http://lists.teslaclub.hk/**mailman/listinfo/ovmsdev<http://lists.teslaclub.hk/mailman/listinfo/ovmsdev>
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>>
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>>
> --
> Rolf Welde Skeie
> Solåsen 27, 5223 Nesttun, Norway
> +47 92403016 / rwskeie at gmail.com
> ______________________________**_________________
> OvmsDev mailing list
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