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I'm looking to select the suitable rate/size of my battery charger to recharge the battery of capacity 740 Ah in 8 hours up to 12 hours maximum.

Here's one comment that takes my intention from a previous topic . Typically, a battery is considered "discharged" when it loses 1/3 of its capacity, therefore it only needs 1/3 of its capacity to be fully charged.

So if we have a battery with a capacity of 740 Ah, the battery is considered discharged when its capacity became 495.8. With these constraints and the above values, the charging time will be

$$ T = \frac{(740-495.8)\ \mathrm{Ah}}{30\ \mathrm{A}} = 8.14 \ \mathrm{hours}$$

Is this calculation correct?

ocrdu
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Tayeb Himri
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  • Welcome! No, you need 100 % SOC for a battery to be fully charged. To charge a 740 Ah battery from 0 to 80 % in 8 hours, you need a 92.5 A charger. Getting from 80 to 100 % SOC (absorption) will take approximately an additional 8 hours. – winny Dec 16 '22 at 08:20
  • Thank you for your prompt response. – Tayeb Himri Dec 16 '22 at 10:34

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