Frequent charging resume and stop after reaching % target

[hudesigns]

My R1S gen2 max pack is charged with Grizzl-E mini at home. I noticed there are frequent resume and stop cycle after schedule charging session is completed. It’s about 1 to 2 times an hour. The schedule is set on Rivian and amperage 40A. Which device could be at fault, car or charger?

Now I am writing this and an idea occurs. Next time I’ll set schedule with Grizzl-E to see if it will stop the cycle. Anybody has similar experience?

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[Nixapatfan]

Most likely it is because your battery is draining below the level set in the schedule so it is topping up. You need to figure out why the battery is draining, like preconditioning the cabin, gear guard or PAAk too close to the truck causing it to wake up too often or 12v on its death bed.

 

[Dasoss]

Most likely it is because your battery is draining below the level set in the schedule so it is topping up. You need to figure out why the battery is draining, like preconditioning the cabin, gear guard or PAAk too close to the truck causing it to wake up too often or 12v on its death bed.

There is an option to use power from the charger or not to maintain charge ih the climate control is running.

 

[Time2Roll]

I would assume cooling pump, 12v battery top charging, or just running the computer. Or some other system is taking some top charge off and so the charging cycles on periodically. Could even be the battery modules balancing and making room for a bit more charge. Calling normal.

Not the same as filling a gasoline vehicle.

 

[hudesigns]

Just to provide some more information as context when this happened.

*Gear Guard is off
*Home proximity is lock only so PAAK not an issue.
*Climate is off
*Average 24 hr battery usage is around 2.3 kWh as reported by Rivian app

It seems a slightly more self draining might be the cause? BTW my 2023 Ioniq 5 on same charger does not have this behavior.

 

[hudesigns]

If it is considered acceptable behavior of Rivian in general, a software option like “Do not auto resume after charging is completed” might useful to reduce wear and tear on both onboard converter and external EVSE.

 

[electruck]

If it is considered acceptable behavior of Rivian in general, a software option like “Do not auto resume after charging is completed” might useful to reduce wear and tear on both onboard converter and external EVSE.

I don't experience this with my Chargepoint. I find it interesting that yours tries to start charging every 45 minutes like clockwork. And if I'm interpreting the messages correctly, it's not actually adding any charge. It just wakes up, attempts to charge, realizes it doesn't need to and then goes back to sleep for 45 minutes. that would seem to rule out a vampire drain issue. perhaps the grizzl-e unit is just logging things that Rivian and Chargeepoint do not?

 

[Nixapatfan]

Just to provide some more information as context when this happened.

*Gear Guard is off
*Home proximity is lock only so PAAK not an issue.
*Climate is off
*Average 24 hr battery usage is around 2.3 kWh as reported by Rivian app

It seems a slightly more self draining might be the cause? BTW my 2023 Ioniq 5 on same charger does not have this behavior.

If you are losing 2.3kw a day then there is something wrong with it, usually it is due to the 12v battery not able to hold a charge long enough thus keeping the truck awake and draining the HV battery trying to keep the 12v charged. Stick a trickle charger on the 12v and see if the excess drain stops. If you have HomeAssistant or RivianRoamer or similar you can track the sleep cycles there. On a healthy truck the average drain is about .5 to 1.5kw a day.

 

[Dark-Fx]

Might be worthwhile to reboot the truck and see if it keeps happening. I know early on this would help with weird vampire drain.

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