JonMu
Member
All by regen issues (Regenerative braking temporarily reduced) were with the battery near 50%...
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Interesting, I wasn’t even aware of the bubbles until reading this thread. Today on a drive, during a long downhill section I noticed the bubbles for the first time in my car. Five of them that later went to four before disappearing, BUT ambient temps were in the low 70’s, SOC was around 61% and I’d been driving for over an hour?Owner's manual.
That bar is the power meter. The left side indicates how much power is going into the battery (regen). The right side is discharge (acceleration). Dots on a side indicate a reduction in either regen or acceleration power. Regen limitation occurs with a cool or cold battery pack as well as a high state of charge. Acceleration limitation typically only occurs when the battery is at a low state of charge (<15-20%).
Sounds correct. As others have said the battery temp wants to be 80* before excepting full regen.Interesting, I wasn’t even aware of the bubbles until reading this thread. Today on a drive, during a long downhill section I noticed the bubbles for the first time in my car. Five of them that later went to four before disappearing, BUT ambient temps were in the low 70’s, SOC was around 61% and I’d been driving for over an hour?
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The BMS is quite complicated and there's no easy answer as to what conditions are needed and how many bubbles there are to limit the brake regen. Originally I thought it was based upon just the battery temperature, but it's not. I've been monitoring my battery temps in the morning via the SMT app and I've seen certain temps at different driving times and the brake regen levels are different.Interesting, I wasn’t even aware of the bubbles until reading this thread. Today on a drive, during a long downhill section I noticed the bubbles for the first time in my car. Five of them that later went to four before disappearing, BUT ambient temps were in the low 70’s, SOC was around 61% and I’d been driving for over an hour?
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But that's the interesting bit. In the first part of my drive (going up the mountain) regen was performing at 100% (indicated on the bar). While I was driving in the canyons, regen was still at 100%. The bubbles only appeared when I was heading home (down the mountain) and had sustained periods of regen. In this case, this makes me doubt it was a low temperature issue, since the pack temps were good for most of my drive. Maybe it was an overheating issue? Is there such a thing as too much regen, even when SOC is low?Sounds correct. As others have said the battery temp wants to be 80* before excepting full regen.
The BMS will also limit brake regen if you're going back down the mountain due to the heat generated.But that's the interesting bit. In the first part of my drive (going up the mountain) regen was performing at 100% (indicated on the bar). While I was driving in the canyons, regen was still at 100%. The bubbles only appeared when I was heading home (down the mountain) and had sustained periods of regen. In this case, this makes me doubt it was a low temperature issue, since the pack temps were good for most of my drive. Maybe it was an overheating issue? Is there such a thing as too much regen, even when SOC is low?
That rings true to me. I'm betting there was so much regen, that things got too hot. Which is a bummer because I was starting to recoup most of my output until this kicked in. At one point I was at 189 miles to empty, after almost 13 miles later, I was showing 192 miles to empty. It'd be fun to be able to charge the car up by driving down a mountain!The BMS will also limit brake regen if you're going back down the mountain due to the heat generated.
The heat from 1 mile while getting towed at 18 mph at 15-20 kW is quite minimal compared to 20-30 minutes down a mountain with regen at 50-70 kW.I'm not sure it's heat... Someone charged a model 3 by pulling it on a track using a pickup. If heat was blocking it, they wouldn't have been able to charge for very long.
I've also left my home without pre-conditioning and the battery pack at 54F.
. . .
The key thing, I've found, is pre-conditioning whenever possible, especially if you're plugged in at home and leaving. The brake regen limitations are completely removed or very minimal every time I've pre-charged to warm the batteries up.
Just turn on the HVAC. In colder weather, Stator motors will warm up and coolant will pass thrift then and eventually pass through batteries.I'll bite, how does one activate pre-conditioning? I thought user activated pre-conditioning was kinda a myth. The BMS does it's magic and none of the magic include user intervention (like pre-conditioning).
Driving down a long hill. Regen worked for about 20 mins then I got the message it was limited. So no regen for the last 15 minutes down. Why would that be.
It was a nice warm day.
Regen Braking Temporarily Reduced - Every timeDriving down a long hill. Regen worked for about 20 mins then I got the message it was limited. So no regen for the last 15 minutes down. Why would that be.
It was a nice warm day.