[Ovmsdev] 12V battery fail
mmezo at selexco.net
Fri May 30 17:34:04 HKT 2014
> I have no idea if OVMS has any part to play other than in reporting
> the issue, but I've posted a full description to speakev at
> Basically I hit a low voltage warning - OVMS notified me via text.
> - why at such a low threshold when it was too late
> - no idea yet if ovms may be causing more drain
The OVMS microcontroller is indeed low power, but possibly the GSM modem
not so much. The OVMS Twizy manual has a big warning that two or three
days with the module pluged and without using or charging the car can
discharge the auxiliary battery and I can attest that after two days I
became a low bat warning on my phone. Admitedly, the Twizy auxiliary
battery is very small.
I've downloaded the modem module manual and see that there is a
powersaving mode. I've scanned through the ovms firmware source and
could not find anywhere where it is beeing used, but maybe I've not
spent enough time. I was planning to try to modify it, so that when the
car is off the modem gets in powersaving mode and maybe wakes only every
10 seconds or so to see if it has some messages.
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