![]() These battery chargers continuously regulate charge voltage and charge current.įor wet gel and AGM batteries, it is recommended to have a sensor for measuring the temperature of the battery. A battery charger with temperature compensation for optimal protectionĮnsuring the longest possible lifespan for gel, AGM and Lithium Ion batteries requires a modern Mastervolt battery charger with a three-step+ charge characteristic. For a 180 Ah battery, for instance, this means a maximum charge current of 60 amperes. 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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