[Ovmsdev] 12v battery alert threshold?

Michael Balzer dexter at expeedo.de
Sat May 19 15:02:27 HKT 2018


Mark disabled the 12V alerts on the roadster firmware some commits ago.

Regarding the alert configuration:

commit 9c1a991a9a27de8afdc9fd408262a2fe0be7aef4
Author: Michael Balzer <balzer at expeedo.de>
Date:   Mon Apr 30 22:39:05 2018 +0200

    Vehicle: 12V battery monitoring & alert
    New configs:
    - vehicle [12v.alert] = 1.6       Voltage drop alert threshold in V vs. reference
    New metrics:
    - v.b.12v.voltage.ref             12V reference voltage [V]
    - v.b.12v.voltage.alert           Alert status (bool)

This works like the old V2 12V monitoring, just a bit improved. The reference voltage is taken after max 15 minutes calmdown time after 12V charging stops. The
initial reference is the first voltage measured at boot.

Also, the AD conversion needs to be calibrated for each module, to compensate component tolerances. If you haven't done that for your modules yet, their 12V
measurements will differ. To calibrate, measure your real 12V level and change config system.adc factor12v accordingly for each module.


Am 19.05.2018 um 02:26 schrieb Greg D.:
> Hi folks,
> I'm getting alerts from OVMS that my 12v battery is failing, as it's
> dropped below the threshold, which is set to 13v for some reason.  So I
> get a notification every time the car transitions from awake to asleep. 
> I don't see a configuration item, nor anything in the OVMS v2 app. 
> Oddly, the threshold is 13.2 for my v3.0 proto module, but I can't find
> a config item there either.
> How do I change the threshold? 
> Greg
> _______________________________________________
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> OvmsDev at lists.openvehicles.com
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Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
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