Nawaz Qureshi of USB made a graph of # cycles vs. % DoD that I got
somewhere. I don't think it's on their web site. I picked off the
numbers:
Expected Life Cycles for USB Deep Cycle Batteries;
Disch. To 1.75 V/cell, 80 deg.F nom., end of life @ 80% cap.
Cycles % DoD Total Ahr factor
.01 * Cycles * % DoD
0 0
10000 5 500
5300 10 530
2800 20 560
1800 30 540
1400 40 560
1050 50 525
800 60 480
670 70 469
560 80 448
440 90 396
350 100 350
The graph data can be presented as total Life Ahr vs. % DoD. The
resulting curve is similar to a Trojan curve in unusable units and is
sufficiently non smooth to infer that the data represents a small, but
good sample. Put the table above into a spreadsheet and make both
graphs (cycles vs. % DoD and Ahr vs. % DoD) to see the life usability.
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