YOUR FIRED ! ! !
just like the LTO's
ROFL
YOUR FIRED ! ! !
In that video they show a cycle life test, but there are 2 different charge/discharge regimes mentioned, 2CA/2CA and 2CA/0.2CA ... I think I got that right. So which one does the graph represent? Can these cells really handle 15000 cycles with a 2CA/2CA charge discharge regime?Richo wrote: ↑Wed, 03 Apr 2019, 12:42
In anycase - back on topic - I did find a youtube video of Yinlong doing destructive tests on thier LTO battery.
Bit of a let down - no bangs, or balls of fire.
https://www.youtube.com/watch?v=eAUYbSDEy6I
Well that is conservative for an LTO.
Hi Richo. Can you tell us why you think that?
Well the only one stating calendar life is Altair-nano.
Well seems I'm WRONG
At the current rate, maybe enough to go for dinner to celebrate ..... at the Scottish restaurantthe remaining $10 930, which had meanwhile been earning interest.
Probably only 500 cycles. 700 at the most. I think most of the ageing has been due to time and temperature. They spent the first 3.5 years of their life on a shelf in my workshop. Badly underestimated how long it would take to finish the car. We were told we'd get 10 years out of them, and that's what we got. Can't complain.
My projects seem to work on LIFO.
Our longest running house power RV battery packs are just over 8 yrs old and test at 100% capacity using the same 0.5CA capacity testing Winston use according to their specs books that come with the cells. I can't see a sudden loss of capacity happening in the next 10 yrs that would render the cells unsuitable for the job, so maybe it is the discharge rate the cells have a problem with rather than age. These cells are in use 24/7 as they are the power pack for these RV's that are on the road full time. The difference is they do not discharge the pack to a low SOC each time, generally around 40% SOC would be the average and not always returned to 100% SOC each time either, so it appears the LYP cells prefer this type of treatment.weber wrote: ↑Wed, 17 Apr 2019, 19:50Probably only 500 cycles. 700 at the most. I think most of the ageing has been due to time and temperature. They spent the first 3.5 years of their life on a shelf in my workshop. Badly underestimated how long it would take to finish the car. We were told we'd get 10 years out of them, and that's what we got. Can't complain.
You are seriously mistaken if you think that having 100% of advertised capacity means they have not lost any capacity. It is common for new LFP cells to have 125% of their advertised capacity. If so, that would mean they have lost 20% in their 8 years.T1 Terry wrote: ↑Tue, 14 May 2019, 13:42 Our longest running house power RV battery packs are just over 8 yrs old and test at 100% capacity using the same 0.5CA capacity testing Winston use according to their specs books that come with the cells. ... It will be interesting to see just how long these systems will maintain their 100% of the advertised capacity under the 2 hr discharge test (0.5CA) it will at least clear up any doubts about the calendar life of these type of cells.
I don't actually care, if we sold a 400Ah battery and it still has more than 400Ah using the factory testing regime after 8 yrs use, I'm happy with that and the customers are over the moon happy. The next service schedule isn't for another 3 yrs, so these batteries will have been in service for 11 yrs, so more than 11 yrs old since manufacture. If they have substantial capacity loss after 11 yrs use, then there could be some truth in the 10 yr shelf life, if not, then it is yet another myth busted.weber wrote: ↑Thu, 16 May 2019, 07:17You are seriously mistaken if you think that having 100% of advertised capacity means they have not lost any capacity. It is common for new LFP cells to have 125% of their advertised capacity. If so, that would mean they have lost 20% in their 8 years.T1 Terry wrote: ↑Tue, 14 May 2019, 13:42 Our longest running house power RV battery packs are just over 8 yrs old and test at 100% capacity using the same 0.5CA capacity testing Winston use according to their specs books that come with the cells. ... It will be interesting to see just how long these systems will maintain their 100% of the advertised capacity under the 2 hr discharge test (0.5CA) it will at least clear up any doubts about the calendar life of these type of cells.
Do you know what their new capacity was?
Don't confuse calendar life with cycle life.
That is yet to be seen, I haven't had one drop dead from natural causes yet, had quite a few murdered though and even those aren't completely dead unless dragged into reverse current flow, that kills them dead.