However, to maximise the lifespan of the Lithium Ion battery, Mastervolt recommends a maximum charging current of 30 % of the capacity. Mastervolt Lithium Ion batteries can be subjected to much higher charge currents.
The maximum charging current is 50 % for a gel battery, and 30 % for an AGM battery. This means that a 400 Ah battery bank and a connected load of ten amperes requires a battery charger capacity of between 70 and 90 amperes in order to charge the battery in a reasonable time. During charging, you usually continue to supply power to connected devices, and this power consumption should be added to the 15-25 %. Charge currentĪ rule of thumb for gel and AGM batteries states that the minimum charging current should be 15 to 25 % of the battery capacity. The float voltage is 13.5 V for 12 V and 27 V for 24 V systems. Lithium Ion batteries are charged with an absorption voltage of 14.25 V for 12 V, and 28.5 V for 24 V systems. The float voltage for this type of battery is 13.25 V for 12 V and 26.5 V for 24 V systems. These figures assume a temperature of 25 ☌.įor wet lead-acid batteries, the absorption voltage is 14.25 V for 12 V systems and 28.5 V for 24 V systems. The absorption phase is followed by the float phase (see 3-step+ charging characteristic on page 242) in which the voltage is reduced to 13.8 V for 12 V systems and 27.6 V for 24 V systems. Mastervolt gel (2 V, 12 V) and Mastervolt AGM (6 V, 12 V) batteries should be charged with a voltage of 14.25 V for 12 V systems and 28.5 V for 24 V systems.
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