[Ovmsdev] VW e-Up: 12V DCDC inverter start
ovms at soko.cc
Mon May 16 18:15:04 HKT 2022
and thanks for the info. Not so good info for my project though... (see
So I reckon the trickle charge with ~12.9V cannot use the full capacity
of 120A (stated in the link above) of the DCDC inverter. Only the the
awake state with the ~14.5V might do that.
I hope I can start my investigation this week with a "regulated
discharge test system" connected to the 12V battery. I hope that the
(trickle) charge will start in any case when a minimum voltage is
reached. Maybe 11.5V or so...
On 16.05.2022 12:04, Michael Balzer wrote:
> it seems many factors influence the DC trickle charge interval,
> besides the actual voltage I think it's also at least temperature and
> age. Chances are it also uses a load history.
> Regarding sending a command to force a trickle charge, that may be
> possible by issuing an actuator test command ("Ausgabetest" in
> OBDeleven), but I don't remember having seen anything like that in
> Heiko's screenshots. I did an analysis for one of these commands
> (unlocking / locking the charge port), see my mail "Re: Schreibzugriff
> OBD" of june 5th 2021 on our e-Up list.
> Another approach would be to wake up the car and keep it awake as long
> as needed. That seems to possible via Comfort CAN only -- you can keep
> the car awake via OBD, but not wake it up (at least no method known yet).
> Be aware waking the car up sets a higher voltage level: trickle charge
> only runs at ~12.9V, while awake it's ~14.5V. I assume the 12V battery
> has a charge regulator so it won't take damage from a longer period at
> that level, but the equipment you'd like to power (assumed) could have
> an issue with that.
> Am 16.05.22 um 08:03 schrieb Soko:
>> Hey guys & especially the VW e-Up ones,
>> I was wondering about the current status of writing to the e-Up.
>> I currently in "need" to start the 12V DCDC inverter when the car is
>> off and locked. Is this currently possible or at least feasible?
>> Are there any detailed infos when this inverter starts automatically.
>> Apparently its not just a question of the current 12V voltage...
>> Thanks heaps
>> OvmsDev mailing list
>> OvmsDev at lists.openvehicles.com
> OvmsDev mailing list
> OvmsDev at lists.openvehicles.com
More information about the OvmsDev