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Does this include thermals on batteries? And how much power is spent on keeping them at the optimals? What about SoC/SoD figures? Because without that the 20 y

by lstodd 2y ago

Does this include thermals on batteries? And how much power is spent on keeping them at the optimals? What about SoC/SoD figures? Because without that the 20 year promise is bullshit. I can sort of name ballpark figures for the above, the thing I can't get is how this can even approach profitable w/o hype and subsidies.

doctoboggan 2y ago
> Does this include thermals on batteries? Yes, not just batteries, but we collect cell level temperature for all cells in all batteries. > And how much power is spent on keeping them at the optimals? We run an AC unit on every container to keep them cool. (Its in the NV desert so never any need for a heater) > What about SoC/SoD figures? We do compute estimates of SoC but as you probably know charge state isn't always easy to estimate. All we really know is voltage, c rate and time. > I can sort of name ballpark figures for the above, the thing I can't get is how this can even approach profitable w/o hype and subsidies. There is certainly risk involved with any investment. But when you are buying batteries at the scale we do the price is probably much lower than you are thinking. And if we do properly gather all the warranty data then the risk of loss on battery failure is minimized.
- lstodd 2y ago
  well.. okay. NV looks like similar enough to mid-to-southern-africa where we did stuff. an AC unit (6KW? 24KW?) (per what, TEU or double-TEU) doesn't look like something sustainable. but we had much less dense installs, so I'm not really ready to argue that SoC vs thermals vs load/charge profile is very not-a-single-number, but when the battery banks suddenly start demanding replacement (+ african logistics ) one develops models for the monitoring dashboards quite fast indeed. I still believe that 20 yr warranty is bullshit on any serious load cycle. But if the manufacturers are willing to swap them, then no problem of course.

by lstodd 2y ago

doctoboggan 2y ago

> Does this include thermals on batteries? Yes, not just batteries, but we collect cell level temperature for all cells in all batteries. > And how much power is spent on keeping them at the optimals? We run an AC unit on every container to keep them cool. (Its in the NV desert so never any need for a heater) > What about SoC/SoD figures? We do compute estimates of SoC but as you probably know charge state isn't always easy to estimate. All we really know is voltage, c rate and time. > I can sort of name ballpark figures for the above, the thing I can't get is how this can even approach profitable w/o hype and subsidies. There is certainly risk involved with any investment. But when you are buying batteries at the scale we do the price is probably much lower than you are thinking. And if we do properly gather all the warranty data then the risk of loss on battery failure is minimized.

lstodd 2y ago
well.. okay. NV looks like similar enough to mid-to-southern-africa where we did stuff. an AC unit (6KW? 24KW?) (per what, TEU or double-TEU) doesn't look like something sustainable. but we had much less dense installs, so I'm not really ready to argue that SoC vs thermals vs load/charge profile is very not-a-single-number, but when the battery banks suddenly start demanding replacement (+ african logistics ) one develops models for the monitoring dashboards quite fast indeed. I still believe that 20 yr warranty is bullshit on any serious load cycle. But if the manufacturers are willing to swap them, then no problem of course.