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Fig. 1: Effect of temperature on capacity
8. Effect of temperature on capacity
As is shown by the graph below, capacity reduces sharply at low temperatures.
9. Cycle life of Victron batteries
Batteries age due to discharging and recharging. The number of cycles depends on the depth of discharge, as is shown in figure
2.
AGM Deep Cycle Gel Deep Cycle Gel Long Life
10. Battery charging in case of cycle use: the 3-step charge curve
The most common charge curve used to charge VRLA batteries in case of cyclic use is the 3-step charge curve, whereby a
constant current phase (the bulk phase) is followed by two constant voltage phases (absorption and float), see fig. 3.
During the absorption phase the charge voltage is kept at a relatively high level in order to fully recharge the battery within
reasonable time. The third and last phase is the float phase: the voltage is lowered to standby level, sufficient to compensate for
self-discharge.
Depth of discharge
Fig. 2: Cycle life
Fig. 3: Three step charge curve
Cycles
Charge voltage
Charge current
Temperature (°C)