137 www.victronenergy.com Victron Energy B.V. | De Paal 35 | 1351 JG Almere | The Netherlands E-mail: sales@victronenergy.com www.victronenergy.com 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 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)
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