I'm unsure what you mean here. Are you saying you attach a 12v battery minder when you charge up the traction battery to reduce vampire losses ?EVDRIVER wrote: Use of a 12V battery tender on any EV is easy if you hide the cable and the car will not run long charge cycles on the 12V and dramatically reduce losses.
Depends on climate. A TMS would never really cool my pack, as my pack is never warm enough to really need cooling. So $0.00 would be spent on kWh for TMS, or very close to it, and the battery life benefit would also be $0.00, or very close to it.finman100 wrote: Who would like to run the math on $$$ spent on a few kWh used to extend the life of a battery pack versus REPLACING the pack or entire car because it no longer gets people from A to B like it did when new?
The reports of really obnoxious vampire drains (of 2 -4 kWh a day) are being resolved with a BMS firmware and OTA updates and my impression is that the fleet will settle down to ~ 10 watts per car at rest when the entire vampire thing gets ironed out. This is not required battery cooling.finman100 wrote: Who would like to run the math on $$$ spent on a few kWh used to extend the life of a battery pack versus REPLACING the pack or entire car because it no longer gets people from A to B like it did when new?
No, when not using the car for a few days the 12V tender keeps the 12V charged, when not used most EVs will cycle the contactor and other systems for a 12V charge cycle, this is usually a minimum of 15 minutes or more. This process uses much more power than charging the 12V directly so the tender shortens these sessions and does not waste all the power of the other higher consumption loads that come on. Not to mention the 12V is not cycled so it lasts much longer.SageBrush wrote:I'm unsure what you mean here. Are you saying you attach a 12v battery minder when you charge up the traction battery to reduce vampire losses ?EVDRIVER wrote: Use of a 12V battery tender on any EV is easy if you hide the cable and the car will not run long charge cycles on the 12V and dramatically reduce losses.
Good to know.EVDRIVER wrote: No, when not using the car for a few days the 12V tender keeps the 12V charged, when not used most EVs will cycle the contactor and other systems for a 12V charge cycle, this is usually a minimum of 15 minutes or more. This process uses much more power than charging the 12V directly so the tender shortens these sessions and does not waste all the power of the other higher consumption loads that come on. Not to mention the 12V is not cycled so it lasts much longer.
I'm not sure I would need to check but enough times to make a difference. If there is no need to charge then it stops the cycle sooner.SageBrush wrote:Good to know.EVDRIVER wrote: No, when not using the car for a few days the 12V tender keeps the 12V charged, when not used most EVs will cycle the contactor and other systems for a 12V charge cycle, this is usually a minimum of 15 minutes or more. This process uses much more power than charging the 12V directly so the tender shortens these sessions and does not waste all the power of the other higher consumption loads that come on. Not to mention the 12V is not cycled so it lasts much longer.
How frequent in the Model 3 ?
I wasn't kidding when I wrote that I think they loaded the car up with people.dtam83 wrote:don't know about the "lack of oomph at highways speeds". I pass people pretty easily, 60 to 80 fairly quickly. definitely better than my old rogue and a corolla I rented a few weeks ago
yeah. read my comment. Unless its a "contender" its a dude to them. Recently, I was in a hurry (for some unknown reason) so I was in the left lane leaving work knowing I had to make a right turn onto the freeway in a few blocks. I punched it on the green and was shocked that I spun tires quite "well" and yes this was in Eco mode (mentioned for all who think that Eco mode has less power...)dtam83 wrote:don't know about the "lack of oomph at highways speeds". I pass people pretty easily, 60 to 80 fairly quickly. definitely better than my old rogue and a corolla I rented a few weeks ago