DJRas
Member
After looking at a LOT of data over the last few days. The ONLY way the car calculates range is by usable kWh.
My car now says it has 60.3 kWh that translates to 218 miles (~276 Wh/mile). On May 13 I had 247 max range = 68.1 kWh. We know there is a 4kWh buffer.
The car does not recalculate the Wh per mile (it should IMHO) by temperature, drive cycles, how often you supercharge, how often you charge to more than 90%, or any other measurable state.
My current 90% SoC is at 3.973 volts and 53.9 kWh. The car DOES recalculate battery percentage on different voltage.
I don't know what voltage is used though for original 100% SoC.
Others say lithium batteries 100% SoC is 4.2 volts period. Tesla may have determined a safety offset to prevent batteries from being actually charged to 100%. Others also say that even a 50% degraded litium battery still charges to 100% at 4.2 volts. That the degraded battery just has less Ah per volt available. Thus you get to 0% faster (ie fewer miles).
So, percent available should not change between a new battery and a degraded battery based on VOLTAGE. What should change is Wh per mile. The car is smart enough to learn this with use and update after every drive.
I NEVER use percent in my gauge, but always use rated range.
That has always been fine. I have pulled into the driveway with 1 mile remaining (thank you 4kWh buffer).
That they are limiting the top end max charge voltage really is the wrong way to protect the battery from damage or fire. They DO control the entire charge process with home charging AND Supercharging. It now takes over an hour to get from 97% to 100% (@2kW for 7 mile range increase). It charges at 10kW up to close to 97%.
This is acceptable to me and I will NEVER charge to 100% (only did that 3 time in the last 12 months). Arbitrarily chopping 13% 8+kWh off the top end is ludicrous.
My car now says it has 60.3 kWh that translates to 218 miles (~276 Wh/mile). On May 13 I had 247 max range = 68.1 kWh. We know there is a 4kWh buffer.
The car does not recalculate the Wh per mile (it should IMHO) by temperature, drive cycles, how often you supercharge, how often you charge to more than 90%, or any other measurable state.
My current 90% SoC is at 3.973 volts and 53.9 kWh. The car DOES recalculate battery percentage on different voltage.
I don't know what voltage is used though for original 100% SoC.
Others say lithium batteries 100% SoC is 4.2 volts period. Tesla may have determined a safety offset to prevent batteries from being actually charged to 100%. Others also say that even a 50% degraded litium battery still charges to 100% at 4.2 volts. That the degraded battery just has less Ah per volt available. Thus you get to 0% faster (ie fewer miles).
So, percent available should not change between a new battery and a degraded battery based on VOLTAGE. What should change is Wh per mile. The car is smart enough to learn this with use and update after every drive.
I NEVER use percent in my gauge, but always use rated range.
That has always been fine. I have pulled into the driveway with 1 mile remaining (thank you 4kWh buffer).
That they are limiting the top end max charge voltage really is the wrong way to protect the battery from damage or fire. They DO control the entire charge process with home charging AND Supercharging. It now takes over an hour to get from 97% to 100% (@2kW for 7 mile range increase). It charges at 10kW up to close to 97%.
This is acceptable to me and I will NEVER charge to 100% (only did that 3 time in the last 12 months). Arbitrarily chopping 13% 8+kWh off the top end is ludicrous.
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