anotherburrito

Active Member
Joined
May 23, 2022
Threads
4
Messages
29
Reaction score
90
Location
West Austin, TX
Vehicles
Rivian R1T, Tesla Model 3 LR + Boost
So I tried to take the rubber mat off the center console to unplug the wireless charger as I saw in a few other threads. Surprisingly on mine, the double-sided tape was super strong and the cover to the wireless charger came right off with the rubber pad! So, here's a look at the TREMENDOUS number of coils in the thing... Bonus shot of the underside of the cover that mentions it's NFC. I'm too dumb to understand what to do with this knowledge, but I thought y'all might like to see it. I unplugged the coils so I could mount my MagSafe charger to the rubber cover without those coils heating it up.

coils.jpg
underside.jpg

 

NY_Rob

Well-Known Member
First Name
Rob
Joined
Feb 9, 2022
Threads
4
Messages
405
Reaction score
562
Location
long island
First Name
Rob
Vehicles
2021 Model 3 LR AWD, 2017 BMW i3 REX
Occupation
IT
Holy moly.... got coil?

There's your vampire drain right there ;)
 

crashmtb

Well-Known Member
Joined
Jul 11, 2021
Threads
0
Messages
2,982
Reaction score
4,784
Location
Man oh Manitoba
Vehicles
2002 aluminium garden shed TD5
Last edited:

Khaneric

Well-Known Member
First Name
Eric
Joined
Nov 11, 2020
Threads
9
Messages
238
Reaction score
757
Location
Simi Valley, CA
First Name
Eric
Vehicles
Rivian R1T, Plymouth Roadrunner
Occupation
IT
Guess they got mad we were all unplugging our chargers :D

Rivian: "USE ALL THE STICKY TAPE!"
 

Tim-in-CA

Well-Known Member
Joined
Sep 30, 2021
Threads
12
Messages
601
Reaction score
1,179
Location
So Cal
Vehicles
Tesla Model S, Telluride, T-Bird, R1S on Preorder
If there are soooooo many coils, why are people reporting positioning issues and charge disconnects when the phone slides around on the pad. I suppose that a coil must be aligned with the coil on the phone to charge properly.
 


OP
OP
anotherburrito

anotherburrito

Active Member
Joined
May 23, 2022
Threads
4
Messages
29
Reaction score
90
Location
West Austin, TX
Vehicles
Rivian R1T, Tesla Model 3 LR + Boost
Now I'm curious, so I found this article about coil arrays: https://www.moshi.com/en/blog/more-coils-doesnt-mean-more-power/

Layering of coils increases distance - In order to fit the maximum number of coils under a charging surface, these coils are often layered, partially overlapping each other. Those coils installed on the lower layer(s) of the array will therefore be further away from the receiver device's coil, reducing the efficiency of power transfer and resulting in slower charging or excessive power consumption (or both).

Obstruction of overlapping coils - Another side-effect of layering is that the coils in lower layers can be partially obstructed by those above, which combined with the aforementioned distance increase for bottom-layer coils can further decrease the efficiency of power transfer.
 
OP
OP
anotherburrito

anotherburrito

Active Member
Joined
May 23, 2022
Threads
4
Messages
29
Reaction score
90
Location
West Austin, TX
Vehicles
Rivian R1T, Tesla Model 3 LR + Boost
If there are soooooo many coils, why are people reporting positioning issues and charge disconnects when the phone slides around on the pad. I suppose that a coil must be aligned with the coil on the phone to charge properly.
I think it's because you have to be aligned with ONE coil to charge. If your phone moves, it's losing that coil and basically has to start over with another one.

Bottom line, it feels like Rivian could have saved some money and made the wireless charger more effective by paying more attention to the rubber surface to keep things secure rather than cramming tons of coils into the area.
 

crashmtb

Well-Known Member
Joined
Jul 11, 2021
Threads
0
Messages
2,982
Reaction score
4,784
Location
Man oh Manitoba
Vehicles
2002 aluminium garden shed TD5
If there are soooooo many coils, why are people reporting positioning issues and charge disconnects when the phone slides around on the pad. I suppose that a coil must be aligned with the coil on the phone to charge properly.
The mat is too thick. In the other thread about this the fcc docs on the charger are posted. The specs indicate 5mm max from charger coil to device coil. The mat+a case and you’re easily past that. Also, even without a case, the camera bump on apple phones in particular makes wireless charging not work well
 

Tim-in-CA

Well-Known Member
Joined
Sep 30, 2021
Threads
12
Messages
601
Reaction score
1,179
Location
So Cal
Vehicles
Tesla Model S, Telluride, T-Bird, R1S on Preorder
The mat is too thick. In the other thread about this the fcc docs on the charger are posted. The specs indicate 5mm max from charger coil to device coil. The mat+a case and you’re easily past that. Also, even without a case, the camera bump on apple phones in particular makes wireless charging not work well
Uggg ... guess, I'll need to cobble together a MagSafe cabled adapter like others are doing. Once again, this is another miss on Rivian's part. Looks like the engineer who designed the charging mat didn't actually have a newer generation phone to test with!
 
OP
OP
anotherburrito

anotherburrito

Active Member
Joined
May 23, 2022
Threads
4
Messages
29
Reaction score
90
Location
West Austin, TX
Vehicles
Rivian R1T, Tesla Model 3 LR + Boost
I also tried to hold my phone against the MagSafe charger with the rubber mat in between. No sticky, no charge. So hiding the MagSafe under the rubber mat by ripping out the coils or something isn't happening either.

IMG_6106 Small.jpeg
 


NY_Rob

Well-Known Member
First Name
Rob
Joined
Feb 9, 2022
Threads
4
Messages
405
Reaction score
562
Location
long island
First Name
Rob
Vehicles
2021 Model 3 LR AWD, 2017 BMW i3 REX
Occupation
IT
Would be very helpful to have a sw option to turn the QI charging system off.
 

Zoidz

Well-Known Member
First Name
Gil
Joined
Feb 28, 2021
Threads
35
Messages
933
Reaction score
2,144
Location
PA
First Name
Gil
Vehicles
Chevy Avalanche, BMWs-X3,330cic,K1200RS bike
Occupation
Engineer
Holy moly.... got coil?

There's your vampire drain right there ;)
Yep, I read up on this a while ago. The QI controller chip repetitively powers up each coil, one at a time, to see if a phone is in range and initiate the charging negotiation protocol. IMO, wireless charging is currently a crap technology. I'll be disconnecting it when I get my R1S.
 

ironpig

Well-Known Member
Joined
Nov 19, 2021
Threads
4
Messages
1,022
Reaction score
1,763
Location
Los Angeles, CA
Vehicles
2022 R1T LE, 2015 4Runner, 1975 FJ55 Land Cruiser
I've yet to have it work with my phone unless I remove it from my already minimal case (which works with all the wireless chargers I already own). And even without the case on my phone it would go in and out and not stay connected. I'm sticking with the cable for now.
 

MisterTea

Well-Known Member
Joined
Nov 17, 2020
Threads
15
Messages
345
Reaction score
1,077
Location
Florida
Vehicles
BMW 745e
I have the iPhone 12 mini. I have to put it in such an odd position to get it to charge, then I push the pedal and it slides a bit and loses the charge.
 

CommodoreAmiga

Well-Known Member
Joined
Dec 30, 2020
Threads
7
Messages
2,378
Reaction score
4,908
Location
USA
Vehicles
N/A
I also tried to hold my phone against the MagSafe charger with the rubber mat in between. No sticky, no charge. So hiding the MagSafe under the rubber mat by ripping out the coils or something isn't happening either.

IMG_6106 Small.jpeg
Stronger magnets?
 

 
Top