Longer term Ohmmu experiences?

[gearchruncher]

Are you counting the normal overhead for when the vehicle is awake/recharging the 12v battery? (Isn't that 150-200W?)

No, but just pointing out a 50W load wouldn't drain the HV battery that fast.
Let's say the car does have to do a 25% duty cycle at 150W overhead while charging, plus 50W all the time.
That's 88W continuous average. That's still 39 days.

The irony to all of this is if a heater makes the car wake up more often, cycle the Ohmmu more often, and use way more total electricity, all while wearing out the Ohmmu when the whole point was to make the car more reliable and efficent.

Note that a 50W continuous draw would cost you $5 a month in extra electricity and possibly additional CO2 emissions.

 

[Flybyglass]

Anyone try the new Ohmmu heated on their M3/Y in colder (below 40F) weather? Any warnings or messages? How did the car and battery perform? I would like to hear from those using it.

Thanks

 

[mstatkus]

I would think this would be a similar issue on the newer battery in the 2022+ cars and it sounds like it has even less capacity.

I did see one alert before I yanked mine and forwarded to Sean.

VCRIGHT_a059_inputResistanceHigh

Not customer facing.

 

[brkaus]

I’m looking for the 40 page thread listing the advantages?

I would think this would be a similar issue on the newer battery in the 2022+ cars and it sounds like it has even less capacity.

Not sure what "this" you are referring to, I assume heat? But the 2022+ cars have full view of the system so they can easily turn on the DC2DC and get power from the HV battery.

 

[mstatkus]

I would think this would be a similar issue on the newer battery in the 2022+ cars and it sounds like it has even less capacity.

I did see one alert

I’m looking for the 40 page thread listing the advantages?

Not sure what "this" you are referring to, I assume heat? But the 2022+ cars have full view of the system so they can easily turn on the DC2DC and get power from the HV battery.

freeze charging batteries

 

[MP3Mike]

freeze charging batteries

The BMS in the vehicles won't charge the battery when it is too cold, and from what some people have said the BMS will draw a lot of power from the battery to generate internal heat so that it can charge it. i.e. The car is designed to work with the Lion battery so it manages it appropriately.

 

[DeepBlue3]

Noticed this today. Getting closer...

 

[Perscitus]

We have been discussing that in a separate thread for a few days. Sadly, its another letdown.

 

[(@r8[]np4nd4]

I have installed the new battery with heating element since 3 weeks without any battery warnings but the car is idling most of the time and doesn't want to get in to sleep mode.

I didn't drive since 3 days and doesn't wake the car.
I didn't have this behavior with the "old" V4+.

 

[Flybyglass]

I have installed the new battery with heating element since 3 weeks without any battery warnings but the car is idling most of the time and doesn't want to get in to sleep mode. View attachment 980150 I didn't drive since 3 days and doesn't wake the car.
I didn't have this behavior with the "old" V4+.

Mine has been in for a few days and started sleep cycles right after the 6 hour initialization. I use scheduled charging so it only wakes at charging time. When you installed did you follow the full process including disconnecting the main battery? If not, use the reset procedure which tourn off battery in the app AND disconnect the main. I would close the Tesla app. Remove USB devices, turn off environmental, switch off power on safety screen wait 10 minutes for everything to power down then do the procedure of switching off battery and disconnecting main battery (see Ohmmu site). Wait a few minutes reconnect using Ohmmu instructions. Car will restart 6 hour initialization. After 6 hours should resume normal.

Tesla | Model 3 / Y (Bluetooth-Enabled) | Reset Procedure via Ohmmu App

support.ohmmu.com

 

[(@r8[]np4nd4]

Yes i disconnected the HV during install but i will try it again and follow the steps exactly.
Maybe it has to do with the temperature because we now have below 50°F at night.

 

[Flybyglass]

Yes i disconnected the HV during install but i will try it again and follow the steps exactly.
Maybe it has to do with the temperature because we now have below 50°F at night.

That would be my next question. Not sure what temperature the heating element activates nor how much power is needed to operate. You might want to wake the car periodically and computer the outside and inside temperature to the battery temperature. I've noticed while charging the 12 volt the temperature may be warmer than outside by perhaps 10-15F. Hasn't been cold enough to really see the heating element in action. Other manufacturers the elements will activate around 40F and shut off around 50F.

 

[Flybyglass]

Yes i disconnected the HV during install but i will try it again and follow the steps exactly.
Maybe it has to do with the temperature because we now have below 50°F at night.

Also, did you update the BMS Firmware to reflect model Tesla you have. The updates are imported direct from the server so any changes are current.

 

[(@r8[]np4nd4]

Also, did you update the BMS Firmware to reflect model Tesla you have. The updates are imported direct from the server so any changes are current.

I cannot update the BMS because the new battery doesn't connect to the ohmmu app. It connects to the "elephant" app but there is no update functionality.

 

[Flybyglass]

I cannot update the BMS because the new battery doesn't connect to the ohmmu app. It connects to the "elephant" app but there is no update functionality.

Never heard of the 'Elephant" app. I would contact support on that one. Or download the Ohmmu app from the IOS store or Google app store.

 

[mstatkus]

I have installed the new battery with heating element since 3 weeks without any battery warnings but the car is idling most of the time and doesn't want to get in to sleep mode. View attachment 980150 I didn't drive since 3 days and doesn't wake the car.
I didn't have this behavior with the "old" V4+.

So right before I yanked my original v4+ mine was awake and not sleeping. I went into Service mode and was getting the

VCRIGHT_a059_inputResistanceHigh

Which was not customer facing. I only knew something was up because I was in the garage hanging plywood on the ceiling and heard the car doing things. I forwarded the message to Sean but not sure how to even know if a profile update pops up.

 

[Flybyglass]

So right before I yanked my original v4+ mine was awake and not sleeping. I went into Service mode and was getting the

VCRIGHT_a059_inputResistanceHigh

Which was not customer facing. I only knew something was up because I was in the garage hanging plywood on the ceiling and heard the car doing things. I forwarded the message to Sean but not sure how to even know if a profile update pops up.

Good to know. Check Service Mode daily's far nothing. (Occasional other messages not related).

 

[Benjamin Brooks]

Good to know. Check Service Mode daily's far nothing. (Occasional other messages not related).

I'm coming up on 1 month with the V4+ installed on my Model 3. No issues, no alerts... so far.

 

[(@r8[]np4nd4]

Never heard of the 'Elephant" app. I would contact support on that one. Or download the Ohmmu app from the IOS store or Google app store.

The "elephant" app is a chinese third party app. That one you see at #859.
Queenie send me that app because they have issues with connecting the new battery with the ohmmu app.
We have to wait for an update.

 

[Flybyglass]

The "elephant" app is a chinese third party app. That one you see at #859.
Queenie send me that app because they have issues with connecting the new battery with the ohmmu app.
We have to wait for an update.

FWIW the IOS app connects and allows BMS firmware updates.