I happened to read an article written by Bill Gates. The context was for Home Energy Storage solutions. He was trying to calculate the cost of the Storage Solution. In the article, he wrote:
"..This figure is based on the capital cost of a lithium-ion battery amortized over the useful life of the battery. For example, a battery that costs $150 per kilowatt-hour of capacity with a life cycle of 500 charges would, over its lifetime, cost $150 / 500, or $0.30 per kilowatt-hour..."
So, he states the life-cycle of a Lithium-ion battery is 500 charges. I immediately started to think if this held true for the Model S battery. If it does, and the life-cycle is 500 charges, then that could affect whether to keep your vehicle plugged in each and everyday, of let the battery drain down to a 10% to 20% SoC before recharging, to increase the number of miles driven over the 500 charges.
I am not a battery guy, so I don't know if the 500 cycle is full discharge to fully charged cycles, or if it is any time that the battery cycles from a lower SoC to a higher SoC.
More thoughts if the 500 charge life-cycle is close to true: I have a 85KWh battery that at 100% charge has a range of 270 miles. Based on those numbers, I tried to calculate the number of miles drive in 500 charges based on the delta in the SoC each cycle.
270 miles per 85KWh = 3.17 miles per KWh
270 miles per 100% SoC = 2.7 miles per %SoC
Theoretically, if I could drive and charge 100% every charge cycle, the maximum miles on the battery would be 270 miles * 500 charges = 135,000 miles over the life of the battery. However, that is not possible or practical if it were. So, if we come up with some average delta SoC cycles, here are miles:
Average Charge Cycle delta SoC%
10% - 2.7 miles * 10 * 500 = 13,500 ( 27 miles driven between charges avg.)
20% - 2.7 miles * 20 * 500 = 27,000 ( 54 miles driven between charges avg.)
40% - 2.7 miles * 40 * 500 = 54,000 (108 miles driven between charges avg.)
60% - 2.7 miles * 60 * 500 = 81,000 (162 miles driven between charges avg.)
80% - 2.7 miles * 80 * 500 =108,000 (216 miles driven between charges avg.)
I would love to hear from someone who know how the Tesla battery pack really works, what is considered a life-cycle charge, and if the 500 life-cycle charges from Bill Gates makes sense.
TIA
"..This figure is based on the capital cost of a lithium-ion battery amortized over the useful life of the battery. For example, a battery that costs $150 per kilowatt-hour of capacity with a life cycle of 500 charges would, over its lifetime, cost $150 / 500, or $0.30 per kilowatt-hour..."
So, he states the life-cycle of a Lithium-ion battery is 500 charges. I immediately started to think if this held true for the Model S battery. If it does, and the life-cycle is 500 charges, then that could affect whether to keep your vehicle plugged in each and everyday, of let the battery drain down to a 10% to 20% SoC before recharging, to increase the number of miles driven over the 500 charges.
I am not a battery guy, so I don't know if the 500 cycle is full discharge to fully charged cycles, or if it is any time that the battery cycles from a lower SoC to a higher SoC.
More thoughts if the 500 charge life-cycle is close to true: I have a 85KWh battery that at 100% charge has a range of 270 miles. Based on those numbers, I tried to calculate the number of miles drive in 500 charges based on the delta in the SoC each cycle.
270 miles per 85KWh = 3.17 miles per KWh
270 miles per 100% SoC = 2.7 miles per %SoC
Theoretically, if I could drive and charge 100% every charge cycle, the maximum miles on the battery would be 270 miles * 500 charges = 135,000 miles over the life of the battery. However, that is not possible or practical if it were. So, if we come up with some average delta SoC cycles, here are miles:
Average Charge Cycle delta SoC%
10% - 2.7 miles * 10 * 500 = 13,500 ( 27 miles driven between charges avg.)
20% - 2.7 miles * 20 * 500 = 27,000 ( 54 miles driven between charges avg.)
40% - 2.7 miles * 40 * 500 = 54,000 (108 miles driven between charges avg.)
60% - 2.7 miles * 60 * 500 = 81,000 (162 miles driven between charges avg.)
80% - 2.7 miles * 80 * 500 =108,000 (216 miles driven between charges avg.)
I would love to hear from someone who know how the Tesla battery pack really works, what is considered a life-cycle charge, and if the 500 life-cycle charges from Bill Gates makes sense.
TIA