[Ovmsdev] Dcdc converter metrics

[Michael Balzer]

I think voltage should be practically always identical at the DC 
converter output to the 12V battery, as there normally isn't anything 
between, and it should also be identical to the 12V reading of the 
module, as it's powered directly by the 12V circuit.

12V current will probably normally only be available as the DC converter 
output, which partially charges the 12V battery, but probably mostly 
powers the 12V components. So yes, that's probably misplaced unter 
"v.b." – my bad.

Does any of your cars provide a 12V current reading at the battery? Or a 
temperature of that battery? These could help diagnose 12V battery 
issues early. But the voltage is normally sufficient to estimate 
degradation.

That's how my Twizy 12V battery looked like when it finally died… 
luckily not by rapid unscheduled disassembly, but it sure smelled like due…





Regards,
Michael


Am 20.12.20 um 03:58 schrieb Steve Davies:
 > On the i3 so far I have lots of info on the DcDc converter - I can 
see the current the converter is putting out.  but so far I didn’t find 
current figure for the actual 12v battery.

Am 19.12.20 um 21:27 schrieb sharkcow:
> Good point! For the e-Up we can also get voltage & current of the dcdc
> converter :)
>
>
> Am 19.12.20 um 20:51 schrieb Derek Caudwell:
>> If additional metrics are being added for the dcdc converter I suggest
>> including the following as well as temp:
>>
>> v.c.12v.voltage   14.2V
>> v.c.12v.current   10A
>> v.c.12v.power     0.14kW
>>
>> For the Leaf I have found the dcdc output voltage, still looking for a
>> current reading to calculate the power output.
>>
>> Cheers Derek
>>
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-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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