Hi Michael, and thanks for the info. Not so good info for my project though... (see https://www.goingelectric.de/forum/viewtopic.php?p=1867824#p1867824 for details). 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... thanks again, Soko On 16.05.2022 12:04, Michael Balzer wrote:
Soko,
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.
Regards, Michael
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 Soko _______________________________________________ OvmsDev mailing list OvmsDev@lists.openvehicles.com http://lists.openvehicles.com/mailman/listinfo/ovmsdev
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