Re:Ford's answer to EV supply chain hell: Cheaper batteries
by rblatz on Sunday July 24, 2022 @11:50AM
(#32214606)
Tesla recommends charging to 100% because otherwise it has trouble accurately estimating the vehicle range and battery state of charge.
Re:Ford's answer to EV supply chain hell: Cheaper batteries
by SigmundA on Monday July 25, 2022 @07:36AM
(#32223016)
Not like they are just using battery voltage for SOC, they are coulomb counting with a shunt, so you only need to charge to 100% once in a while to account for drift.
LFP gets 2x the cycle count at 100%-0% as a NMC does at 80%-20%. Due to its lower cell voltage it has less voltage driven aging than NMC.
Elon: "I’d personally slightly opt for iron pack, as it wants to be charged to 100%, whereas nickel prefers ~90%."
https://twitter.com/elonmusk/status/1431040308943364097?lang...
Re:Ford's answer to EV supply chain hell: Cheaper batteries
by cogman10 on Sunday July 24, 2022 @11:55AM
(#32214663)
True. Though the damage is low from hitting 100% which is part of the reason why this is a "just leave it at 100%" rather than a "hit 100% once a week".
That said, I'd probably do 90% as the max and 100% on the weekend if I owned an LFP vehicle.
Re:Ford's answer to EV supply chain hell: Cheaper batteries
by dangrossman on Sunday July 24, 2022 @02:09PM
(#32216049)
The average American, buying a ~250 mile range EV, would only need to plug it in to charge once a week. Maybe twice. So, just charge it to 100% every time you charge it.
Re:Ford's answer to EV supply chain hell: Cheaper batteries
by manmal on Sunday July 24, 2022 @02:23PM
(#32216182)
There’s also a downside to LFP batteries: They charge significantly slower. There was a report in Germany about Teslas with LFP packs only achieving 73kW on average. For some trips this means 50% longer charging times.
Re:Ford's answer to EV supply chain hell: Cheaper batteries
by SigmundA on Monday July 25, 2022 @07:42AM
(#32223058)
I believe there was an issue with earlier software but current models meet or exceed the NCA batteries in charge rate with a 80kw average. Also 73kw is not 50% slower.
https://insideevs.com/news/514857/mic-tesla-model3-srp-charg...
LFP is also safer with much less chance for thermal runaway. So safer, cheaper, longer lasting, easier material sourcing, only downside is lower energy density (about 20% hit for same weight) but there is a huge effort to improve that.
You can LFP's pretty cheap now for home backup or RV use. I replaced my RV house batteries with LFP for 4 times the usable capacity in half the weight of my old lead acid for about 3 times the cost. You can get 48v 19" rack batteries very cheap for power backup uses. I think LFP's are going to take over most uses in including cheap commuter automobiles.