SpaceCadet
Member
- Joined
- May 1, 2023
- Messages
- 23
For two days now, I've noticed a weird behavior of my 2017 Leaf. If I unplug and replug my level-1 charger when the battery is above ~93% SOC leafspy (100% according to the dash), the traction battery will discharge... somewhere!
So I'm plugged in, but draining the traction battery from 98% > 93%, GIDs are dropping from 208 > 198. Where the heck is the energy going, and why?
The dashboard lights show charging, but leafspy reports a battery drain. The vehicle is off and parked with nothing running. I left it for an hour on two separate mornings and it drained from 98% down to 90-ish %, with a corresponding drop in GIDs.
The first morning, I unplugged and replugged at 97% and found it at 90% about 30 minutes later. Leafspy stayed connected and produced a 0 mile trip log said 278 drive and 60 charge, dropping 9 GIDs over 22 minutes. It also said 0 SHVolt, but I don't know what that is, though it usually reads near 400. Everything else looked nominal.
The second morning, I unplugged and replugged at 97% and found the same thing. Unplugged and replugged again at 93% and it continued to drain down to 92% in just a few minutes.
When the battery is depleted it seems to charge overnight just fine. Sometimes it cuts off earlier than I'd like, which is why I tried the re-plugging before leaving in the hour I have awake at home before leaving.
I have a very depleted 30 kWh battery (<60% SOH) and I'm waiting for a replacement.
I only have an onboard 3.6kW charger (no fast charging, and only half-speed level 2, if I stop at a station)
What the heck is this?! Where is the battery drain coming from? Where is the energy going? Obviously, I'm not going to be plugging in at high SOC anymore, but I'd like to know if this is some sort of charge management feature or a fault.
I can limp to work and back with 30 GIDs to spare out of 195, but I'd rather start reliably with all 207 remining GIDs.
Some other weirdness:
- I burn 50 GIDs on the way to work, but nearly 100 on the way back. I am against the wind and uphill and I drive maybe an average of 5mph faster, but I do sprint up to 75mph+ on the way home. It seems that speeds over 55 radically deplete the battery. Or are the GOM and leafspy just waaaaaaay off in their battery capacity estimates and the last third of the battery is much weaker than forecast (All GIDs are not created equal)?
- None of Leafspy's measurements seem to agree with each other. It tells me I have 15 kWh at the beginning of the day, burn 1.6+2.9+.18+.18+4.1 (9 kWh), and end the day with <3kWh. Last I checked 15 - 9 = 6, not 3. While driving, it will claim between 4 and 8 mi/kWh, VERY biased toward the high end most of the time. If I were getting the low end of that, (4kWh), I'd be burning 11.5 kWh. 15 - 11.5 = 3.5 remaining kWh, which is closer, but still not right.
Is my battery so badly wrecked that Leafspy can't accurately report on it? Am I getting cell dropouts or something similar that is killing my range at low SOC? Seems something like that. I have experience with this with NiCad batteries, but I don't know enough about LI batteries to diagnose.
Thoughts?
So I'm plugged in, but draining the traction battery from 98% > 93%, GIDs are dropping from 208 > 198. Where the heck is the energy going, and why?
The dashboard lights show charging, but leafspy reports a battery drain. The vehicle is off and parked with nothing running. I left it for an hour on two separate mornings and it drained from 98% down to 90-ish %, with a corresponding drop in GIDs.
The first morning, I unplugged and replugged at 97% and found it at 90% about 30 minutes later. Leafspy stayed connected and produced a 0 mile trip log said 278 drive and 60 charge, dropping 9 GIDs over 22 minutes. It also said 0 SHVolt, but I don't know what that is, though it usually reads near 400. Everything else looked nominal.
The second morning, I unplugged and replugged at 97% and found the same thing. Unplugged and replugged again at 93% and it continued to drain down to 92% in just a few minutes.
When the battery is depleted it seems to charge overnight just fine. Sometimes it cuts off earlier than I'd like, which is why I tried the re-plugging before leaving in the hour I have awake at home before leaving.
I have a very depleted 30 kWh battery (<60% SOH) and I'm waiting for a replacement.
I only have an onboard 3.6kW charger (no fast charging, and only half-speed level 2, if I stop at a station)
What the heck is this?! Where is the battery drain coming from? Where is the energy going? Obviously, I'm not going to be plugging in at high SOC anymore, but I'd like to know if this is some sort of charge management feature or a fault.
I can limp to work and back with 30 GIDs to spare out of 195, but I'd rather start reliably with all 207 remining GIDs.
Some other weirdness:
- I burn 50 GIDs on the way to work, but nearly 100 on the way back. I am against the wind and uphill and I drive maybe an average of 5mph faster, but I do sprint up to 75mph+ on the way home. It seems that speeds over 55 radically deplete the battery. Or are the GOM and leafspy just waaaaaaay off in their battery capacity estimates and the last third of the battery is much weaker than forecast (All GIDs are not created equal)?
- None of Leafspy's measurements seem to agree with each other. It tells me I have 15 kWh at the beginning of the day, burn 1.6+2.9+.18+.18+4.1 (9 kWh), and end the day with <3kWh. Last I checked 15 - 9 = 6, not 3. While driving, it will claim between 4 and 8 mi/kWh, VERY biased toward the high end most of the time. If I were getting the low end of that, (4kWh), I'd be burning 11.5 kWh. 15 - 11.5 = 3.5 remaining kWh, which is closer, but still not right.
Is my battery so badly wrecked that Leafspy can't accurately report on it? Am I getting cell dropouts or something similar that is killing my range at low SOC? Seems something like that. I have experience with this with NiCad batteries, but I don't know enough about LI batteries to diagnose.
Thoughts?