This high current charging is beneficial to these batteries and leads to increased cycle-life. Lifeline AGM’s have a minimum recomendation of 20% of installed Ah capacity. Batteries such as Odyssey TPPL AGM’s, Northstar TPPL AGM’s & Firefly Carbon Foam all benefit from high current charging (40% of installed Ah capacity is advised). When sizing a charger it is always important to pay attention to minimum charger sizing recommendations. Pay Attention to Your Battery Manufacturers Suggested Charging Guidance! Sizing on the larger side, for faster charging, should take into account the battery type you are charging eg: GEL, AGM or Flooded. Sizing at 10% of Ah capacity of course assumes you have the time needed to charge at 10% of Ah capacity and no other loads while charging. A 400Ah battery bank, sized at 10%, would get a 40A charger. The general consensus, & industry recommendation, is to size a hard wired charger for a minimum of 10% of the banks rated Ah capacity, for flooded deep cycle batteries. This is a decision that is entirely up to the user, with some caveats.
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