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Are you an EE? Do you have experience designing low voltage automotive system architectures? Do you realize you're comparing apples and oranges?
then how does gear guard work? Has anyone identified any PIR sensors to initiate waking the system to record the cameras? I haven't seen any. My guess is gear guard is an afterthought and they are trying to use what they have to accomplish it, which wastes a lot of energy.
That's not true, most ECU nodes should be asleep even with gear guard on - that's the whole point of CAN bus. If sleep implementation wasn't an issue Rivian wouldn't be addressing it with their updates.
Nowhere did I state that it wasn't wasteful or counter to their mission. I'm saying it isn't unexpected , or unreasonable, for what they are doing with the current platform.
Sure, but you're keyed in on gear guard and I'm fairly certain that's not the primary culprit here. If it was, turning it off would make this problem go away, and by all reports that's not the case.
The amount of vampire drain is definitely due to battery management. It must be overzealous though in keeping a narrow range when truck is off and idle. Lithium ion is not THAT delicate. There isn't an issue with letting the 2170 cells get to 35° or 95°F when sitting idle. There will be SOME temperature management in severe extremes. When vehicle is started or plugged in, they can limit current rate based on battery temperature until it's conditioned. Think of the "snowflake" on Teslas. That's why they do it. If battery is cold-soaked from sitting idle in freezing temps all night, there is limited acceleration and regen until the battery has been warmed to the proper temperature for the current rate. It's a complete waste to be conditioning the battery to nominal temperatures 24/7. I'm hoping this is something Rivian fixes and soon.
Agree. Battery powered Ring type cameras are always on watch and consume a fraction of watt per hour. (23wh battery lasts 2-4 months depending on activity) - It's also NOT gear guard since disabling gear guard doesn't solve the problem. As you said, it doesn't make sense either based on the amount of loss. Surely Rivian is aware with all the R1Ts they have waiting for delivery.
Replacing 90,000 large battery packs during warranty is not a risk they want to take so they probably thought they would be on the safe side at our expense. I am sure many companies are working on a chemistry and construction of a battery that is more suitable for auto industry and when our battery is caput, we will be looking at how we can replace our battery with one of the ones with higher density that can put up with more abuse. For now, I really hope the update for this comes soon.
Yeah, my professional Tuesday morning armchair battery management designer opinion is it seems that Rivian in general is keeping the thermal limits exceptionally narrow.
I've had this suspicion for a while that if the car is plugged in its logic becomes "Hey, I''ve got shore power. I can do all this housekeeping." but if it isn't it takes a more conservtive approach. Any thoughts on that theory?
I feel like it wants to, but maybe sometimes doesn't and hence some of the other drain. Looking at history of the EVSE, I had it plugged up for almost 48 hours about a week ago and it shows 6kWh delivered to the truck during that time.
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