mn4az
Well-known member
Appreciate the analysis and it fits with my thinking, which admittedly was more piecing things together than rooted in data. The theory of not having access to 20% of the pack (my speculation is the BMS is doing what it can to protect the pack) because of the low voltage/all up battery degradation makes sense. Which also fits the reasoning of getting 37-ish miles on a full charge.
At this point is sure seems as if...
Low cell voltage + Pack Degradation + Power Draw (speed, elevation, heating cabin and temps) = "Motor Power is Limited" (MPL) where the BMS doing what it can to protect the pack by making ~20% of it not accessible to the driver. Thus, turning it into a glorified golf cart at this winter. :-(
My college age daughter is driving the car about 15 miles round trip to her engineering internship, and we are doing some experiments. The charge timer and pre-heat timer are set for 730a M-F and the car sits at her internship unplugged for 8-9 hours and isn't driven during that time.
Yesterday she did not get the "Motor Power is Limited" on the way to her internship (expected) but, after it being cold soaked (it was around 20F yesterday) she got on a section of road that is 55MPH and climbs approximately 100 feet over about a half mile. This small climb starts at about mile 5 of her 7.5-mile commute home and the MPL appeared. It stayed that way for the rest of her commute home. I expected this to happen, but she didn't. She figured that with a 70-80% SOC it would be fine.
Today the temperature is hovering around 35F, and we'll see if the MPL appears or not. I'll report back the results.
Of interest to me is why the owner of the Leaf in the below thread had a DTC appear and we haven't yet. I speculate the voltage difference he had was/is higher than mine, thus leading to the DTC event.
https://mynissanleaf.com/viewtopic.php?p=627932#p627932
At this point is sure seems as if...
Low cell voltage + Pack Degradation + Power Draw (speed, elevation, heating cabin and temps) = "Motor Power is Limited" (MPL) where the BMS doing what it can to protect the pack by making ~20% of it not accessible to the driver. Thus, turning it into a glorified golf cart at this winter. :-(
My college age daughter is driving the car about 15 miles round trip to her engineering internship, and we are doing some experiments. The charge timer and pre-heat timer are set for 730a M-F and the car sits at her internship unplugged for 8-9 hours and isn't driven during that time.
Yesterday she did not get the "Motor Power is Limited" on the way to her internship (expected) but, after it being cold soaked (it was around 20F yesterday) she got on a section of road that is 55MPH and climbs approximately 100 feet over about a half mile. This small climb starts at about mile 5 of her 7.5-mile commute home and the MPL appeared. It stayed that way for the rest of her commute home. I expected this to happen, but she didn't. She figured that with a 70-80% SOC it would be fine.
Today the temperature is hovering around 35F, and we'll see if the MPL appears or not. I'll report back the results.
Of interest to me is why the owner of the Leaf in the below thread had a DTC appear and we haven't yet. I speculate the voltage difference he had was/is higher than mine, thus leading to the DTC event.
https://mynissanleaf.com/viewtopic.php?p=627932#p627932