You advise your charger provides 23 A 48 v, so if your batteries were completely discharged (which they never should be, and not accounting for the losses due to inefficiency of the charging process which others on this site indicate are as much as 40%!) it should theoretically take about 70 hours to recharge your system. So in effect, you have created a 48 v 200 ah battery out of each group of 4, and you then tied 8 of those groups together in PARALLEL to form a system of 48 v 1600 ah.
Best 9 volt battery charger series#
You say they are in PARALLEL in groups of 4, but you probably meant in SERIES in groups of 4 as you indicate that you have a 48 v system. I am no expert but I will take a shot at this, though your question was a year ago and I assume you got an answer by now! You have 32 12 v batteries. 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. Answer (1 of 10): The voltage required to charge has to be larger than the voltage present so if the battery is at 12 v, even 12.1 volts will eventually charge. this alone throws your charge times way, way off. Tip 2: if you have 3 batteries to charge, take 2 12 volt battery chargers and hook the batteries up in a series. This is not the best way to recharge 8-volt batteries. also, you are assuming the top 20% of battery capacity (80-100%) is replaced at the same rate as the first 30% (50%-80%). Tip 1: If you use a 12-volt charger for one battery, make sure to keep your eye on both. 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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