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Lithium Titanate (LTO) battery bank build.
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<blockquote data-quote="wew lad" data-source="post: 8658537" data-attributes="member: 665412"><p>I don't think 2000-3000 cycle is accurate for lifepo4 unless we're talking about &lt;50% DOD and not full cycles. If it was full cycles that'd be 10+ years considering AGM's have 200-300 80-100% DOD cycles and last 3 years reasonably and up to 5+ if maintained. The claims I see are that they'll last 2000-5000 cycles with 80% capacity left but theres 0 mention of DOD and their C usage over their lifespan.</p><p></p><p>The LiFePo and LiPo I've worked with generally are used up to 70-80% capacity and discharged on average to 25-40% and we get approximately 150 cycles out of them but they are worked HARD. Near max C rating for charge and discharge and high heat. Obviously we could get up to 250 cycles out of them if we went down to ~50% capacity but that hurts flight time and is just not worth it. </p><p></p><p>However, if the ratio is still the same and you get 2-3k high DOD cycles that's a major improvement and you could expect the cells to last 10-20 years. Obviously this is just an estimate and real research is needed but I don't think any of us have the funding for that lol plus 10-20 years in electric busses as you mentioned certainly seems like an appropriate cycle life you could sell. </p><p></p><p>edit: I looked a little deeper and the claims from companies do say those cycle numbers are at 100% DOD which is strange to me because I've never seen a cell last that long in the real world. They're still leaving out the charge/discharge standard used during those cycles so I'm hesitant to believe it</p></blockquote><p></p>
[QUOTE="wew lad, post: 8658537, member: 665412"] I don't think 2000-3000 cycle is accurate for lifepo4 unless we're talking about <50% DOD and not full cycles. If it was full cycles that'd be 10+ years considering AGM's have 200-300 80-100% DOD cycles and last 3 years reasonably and up to 5+ if maintained. The claims I see are that they'll last 2000-5000 cycles with 80% capacity left but theres 0 mention of DOD and their C usage over their lifespan. The LiFePo and LiPo I've worked with generally are used up to 70-80% capacity and discharged on average to 25-40% and we get approximately 150 cycles out of them but they are worked HARD. Near max C rating for charge and discharge and high heat. Obviously we could get up to 250 cycles out of them if we went down to ~50% capacity but that hurts flight time and is just not worth it. However, if the ratio is still the same and you get 2-3k high DOD cycles that's a major improvement and you could expect the cells to last 10-20 years. Obviously this is just an estimate and real research is needed but I don't think any of us have the funding for that lol plus 10-20 years in electric busses as you mentioned certainly seems like an appropriate cycle life you could sell. edit: I looked a little deeper and the claims from companies do say those cycle numbers are at 100% DOD which is strange to me because I've never seen a cell last that long in the real world. They're still leaving out the charge/discharge standard used during those cycles so I'm hesitant to believe it [/QUOTE]
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