scrambler wrote: ↑
Sun May 19, 2019 2:13 pm
neomaxcom wrote: ↑
Sun May 19, 2019 1:43 pm
In reading this topic, I saw that the 2014 Spark EV had a 22kw A123 battery and the 2014's warranty calls for warranty coverage at 65%. That would suggest that warranty replacement could occur when the A123 battery degraded to 14.3 KW within eight years and 100,000 miles.
First the 2014 Spark total original battery capacity is supposed to be 21kWh not 22 kWh
But the thing to keep in mind is that when you evaluate your current capacity, you are getting the current USABLE capacity, and not the current full capacity.
The nominal USABLE capacity is not the full 21kWh, because the Spark never fully charges or discharges the battery to protect it.
Unfortunately, there are no information on what is the nominal USABLE battery capacity, but it is supposed to be somewhere between 18.5 kWh to 19.5kWh.
This means the threshold for 35% degradation would be around 12 kWh to 12.675 kWh and not 14.3 kWh as you mention above.
Thanks for the correction on the full capacity. It like a lot of things regarding this point in EVs evolution, are based on inadvertent errors and it is always good to clarify the few concrete facts.
But as you point out, the best anyone can muster is KWh range. This is not a criticism of you; rather it is recognition that we're just now beginning to ask the questions.
I also know that as consumers we're starved for information while we also know that GM is, at this moment, collecting information on our cars as a class and knows precisely how the degradation is progressing both in general and in regard to each car. Still, because we don't even know the starting KWh capacity, we're just totally in the dark.
I will say that probably the most critical aspect of this is how to keep this rolling stock (EVs like the Spark) in operation. One way would be to repair or replace batteries when the degradation becomes oppressive. One way to make degradation a minimal inconvenience is to broadly expand the availability of EVSE's. If charging were available at most public parking areas - 1-4 EVSE's available at most places required to have public toilets, the value of a good running but battery-limited EV would expand dramatically. (Remember the time to a full state of charge decreases over time, even for EVs with 3.3 kw L2 maximum charging.)
It is also important, I think, for future Li-on based EVs, that the first generation of the product not be known for junking eight year-old cars with 50,000 miles on them.