3 ms·
You can't discharge lead-acid as deeply as LFP without destroying longevity. So that 150Ah, probably only has 75Ah of useable capacity. The LFP battery will al
by andruby 5y ago
You can't discharge lead-acid as deeply as LFP without destroying longevity. So that 150Ah, probably only has 75Ah of useable capacity.
The LFP battery will also last for ~5000 cycles, after which it'll still have ~80% capacity, and thus is still valuable. Lead acid only has a life of 500~1200 cycles. In other words: you'll have replaced the lead acid battery 4~10 times before you need to replace the LFP.
IIRC, lead acid has a higher voltage drop when drawing a lot of current. Meaning that with LFP you can power larger loads.
Taken together, for most use-cases, the lifetime TCO of LFP is better than lead acid.
- JKCalhoun 5y agoAlso, LFP weigh less than lead-acid.
- tzs 5y ago> The LFP battery will also last for ~5000 cycles, after which it'll still have ~80% capacity, and thus is still valuable. Lead acid only has a life of 500~1200 cycles. In other words: you'll have replaced the lead acid battery 4~10 times before you need to replace the LFP. What happens if you keep using the LFP battery after that? Does the capacity continue to fall to zero, or is there some point it levels off and you can use it indefinitely after that if you don't mind the reduced capacity?
- andruby 5y agoThe curve seems to be pretty lineair. So I think you can do another 5k cycles and have 60% left, once more for 40% etc. A quick search didn’t reveal a full curve chart to zero though. I know that a lot of cheaper LFP cells on aliexpress are used “grade B” cells, eg cells that had an original capacity of 120Ah that are resold as 90Ah cells after their first 5k cycles. There is a chart for 3k cycles here: https://www.ctechigroup.com/deep-cycle-life-lifepo4-cell-3-2v-280ah-for-electric-truck https://www.ctechigroup.com/deep-cycle-life-lifepo4-cell-3-2...