so your formula is way off! replacing 120Ah with a 13a charger would require at least 24 hours. If the battery had a capacity of 240Ah, and was discharged to 120Ah, (like your example) it would take about 6 hours to replace 72Ah (50-80%), and significantly longer to replace the other 48Ah (80-100%) keeping in mind 14.6v would not really get you to 100%… this would require a higher (equalizing) voltage of say 15.5v for several hours. so, the charge rate decreases and charge time increases significantly, as the battery becomes more charged. so by the time it’s at say 90% charged, it may only accept about 5 or 6 amps. but then, as the battery builds up resistance, the amps begin to taper off, and taper off more quickly as the battery becomes increasingly charged. So, 50% of available capacity = 60Ah… at 14.6v and 13a, it would take about 3 hours to get from 50% – 80% available capacity. this alone throws your charge times way, way off. also, you are assuming the top 20% of battery capacity (80-100%) is replaced at the same rate as the first 30% (50%-80%). nor have you considered a 120Ah battery should only be discharged to 60Ah (50% of its capacity). You have not factored in the charge voltage.
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