Hello all. I've experienced a strange phenomenon recently that I'm hoping to find more information about.
I have a 2011 Roadster 2.5 (#1213). I've recently noticed a change in Ideal Miles when returning to use my car after charging. I periodically check the CAC level, and the number has actually increased, so initially I was not convinced the battery was losing health. I decided to set a timer and watch the car as it approaches the full 85% Standard Mode charge. Here's where I discovered what was happening.
I live in north Texas. The temperatures have regularly been in the high 90's this past week. The car does as it usually does: the amperage drops from 40A (I charge using a NEMA 14-50) to a lower amount as it approaches the end of the Standard charge (usually 82% SOC until 85%). This is all natural. Here's where I've noticed the change.
The car regularly kicks on the front A/C fans to cool the batteries in higher heat during charging. This is something I'm used to seeing, especially in the summer months so far (back in January/February, the car rarely did so). However, I sat in the car as it's trickle-charging, and noticed that the amperage jumps from 23-24, to as high as 32A when the fans kick on during the end of the Standard Charge. About a whopping FIVE seconds after the fans kick on, the charging stops, and "Done Charging" appears on the VDS. The only issue is, the car isn't done charging. It's easily 4-6 miles below the full 85% standard charge. When checking in the SOC tab in the diagnostics, the charge level reads 83%.
I wasn't 100% convinced this was a recurring phenomenon until I clicked "Top-Off". The same thing happens again; charging starts, amperage gets to 20-23A, and suddenly the fans kick on, bringing it up to 30A. Click. Charging stops again. Perhaps the car won't trickle charge at that high of amperage, so it naturally shuts off? My question to the community is: has anyone else experienced this, and does anyone have any further insight? I'm not necessarily worried or thinking anything is wrong, but love discussions. Thanks so much in advance!
I have a 2011 Roadster 2.5 (#1213). I've recently noticed a change in Ideal Miles when returning to use my car after charging. I periodically check the CAC level, and the number has actually increased, so initially I was not convinced the battery was losing health. I decided to set a timer and watch the car as it approaches the full 85% Standard Mode charge. Here's where I discovered what was happening.
I live in north Texas. The temperatures have regularly been in the high 90's this past week. The car does as it usually does: the amperage drops from 40A (I charge using a NEMA 14-50) to a lower amount as it approaches the end of the Standard charge (usually 82% SOC until 85%). This is all natural. Here's where I've noticed the change.
The car regularly kicks on the front A/C fans to cool the batteries in higher heat during charging. This is something I'm used to seeing, especially in the summer months so far (back in January/February, the car rarely did so). However, I sat in the car as it's trickle-charging, and noticed that the amperage jumps from 23-24, to as high as 32A when the fans kick on during the end of the Standard Charge. About a whopping FIVE seconds after the fans kick on, the charging stops, and "Done Charging" appears on the VDS. The only issue is, the car isn't done charging. It's easily 4-6 miles below the full 85% standard charge. When checking in the SOC tab in the diagnostics, the charge level reads 83%.
I wasn't 100% convinced this was a recurring phenomenon until I clicked "Top-Off". The same thing happens again; charging starts, amperage gets to 20-23A, and suddenly the fans kick on, bringing it up to 30A. Click. Charging stops again. Perhaps the car won't trickle charge at that high of amperage, so it naturally shuts off? My question to the community is: has anyone else experienced this, and does anyone have any further insight? I'm not necessarily worried or thinking anything is wrong, but love discussions. Thanks so much in advance!
