Guru
Joined: 15/07/2006
Location: AustraliaPosts: 676
| Posted: 11:09am 02 Dec 2014 |
G'Day Simon, Don't waste your time trying to convince the 'leaddities'. There is more to life than trying to pick a fight about something.
Smile and wave. Soon everyone one will be smiling and waving!
I think these Lithium cells are doing quite well for the abuse they have seen (in the EV). They are still working like they did when I put them on the house wind/solar system a year ago. I do have a single layer of Relativities active balancing on them. That is 2 x 8 cell Relativities, no cross-over between the top 8 cells and the bottom 8 cells. Relativities does not keep up with the imbalances. The cell log 8 monitors don't help either, they draw their operating power from cells 1-6 and so cells 7 & 8 always go high. I have manual balanced with 3.7v chargers and 12v halogen bulbs, right from the start and still manual balance now.
The specs say they should be around 2000 cycles at 80% DOD. They have frequently been taken below 80% DOD. Even in the wind/solar system they are constantly discharged very well. With 2 x Latronics PVE 1200 grid inverters constantly feeding from the lithium's, they live around the 80% discharged state. The grid inverters shutdown (pack at 53v) at sundown and then I still draw power from them over night. They would be somewhere around that 2000 cycles now and yet they still soldier on!
Trev @ drivebynature.com