Your math is oversimplified and thus confusing.stevenal wrote: ↑Thu Jan 13, 2022 2:05 pmSo you took 18Ah/16 cells =1.1Ah per cell. Trouble is, we have the same number of hours (8) and the same number of amperes (2.2) in each cell. Cells in series increase voltage, not amps. If your starting numbers are correct, each D cell will need to supply the full 18 Ah. If you want 1.1 Ah per cell, you will need 16 parallel strings of 16 cells in series, or 16^2 cells total.
You can't look at Ah separately, you *HAVE* to factor in the voltage, Just talking about "18ah" in isolation is meaningless.
and your 'requirement' for 256 D batteries is ludicrous.