P
age
9
3.3 - LOW DISCHARGE RATE EFFECTS
Battery cycle life will be reduced when the constant load applied in a cyclic
application is at or below 0.7% of the total Ah in the battery bank (C20 rating). This is
due to a higher rate of sulfation occuring in the middle of the plate that will cause a
reduction in available capacity which in turns increases the depth of discharge over
time. An effort to either increase the load above 0.7% of C20 and/or reduce the size
of the battery bank’s capacity so the load is above 0.7% of C20 should be put forth if
possible.
3.4 - DEPTH OF DISCHARGE VS. BATTERY LIFE
Battery cycle life will vary significantly depending on the depth of discharge. The
deeper the depth of discharge, the fewer the cycles a battery will deliver. Conversely,
the shallower the depth of discharge, the more cycles a battery will deliver (as shown
in the chart below).
To optimize the health of your battery, limit discharge to 80% or less.
Operation
CYCLE LIFE vs DEPTH of DISCHARGE
(DOD)
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
DOD
0
500
LIFE CYCLES (per BCI)
1000 1500 2000 2500 3000
4000
3500
4500 5000 5500 6000
*(Based on BCI Testing @ 2-hr Rate)
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