Easy
Battery Charging Time and battery Charging Current Formula for Batteries. (
with Example of 120Ah Battery).

Battery Charging Current and Battery
Charging Time formula

Here
is the formula of Charging Time of a Lead acid battery.

T = Ah / A

Suppose for 120 Ah battery,

First of all, we will calculate charging current for 120 Ah battery. As we know that charging current should be 10% of the Ah rating of battery.

but due to losses, we can take 12-14Amperes for charging purpose.

suppose we took 13 Amp for charging purpose,

but this was an ideal case…

practically, this is noted that 40% of losses ( in case of battery charging)

Now Charging Time of battery = Ah/Charging Current

**Charging Time of battery = Battery Ah / Charging Current**T = Ah / A

**Example,**Suppose for 120 Ah battery,

First of all, we will calculate charging current for 120 Ah battery. As we know that charging current should be 10% of the Ah rating of battery.

**so charging current for120Ah Battery = 120 x (10/100) = 12 Amperes.**but due to losses, we can take 12-14Amperes for charging purpose.

suppose we took 13 Amp for charging purpose,

**then charging time for 120Ah battery = 120 / 13 = 9.23 Hrs.**but this was an ideal case…

practically, this is noted that 40% of losses ( in case of battery charging)

**then 120 x (40 / 100) = 48 …..(120Ah x 40% of losses)****therefore, 120 + 48 = 168 Ah ( 120 Ah + Losses)**Now Charging Time of battery = Ah/Charging Current

**168 / 13 = 12.92 or 13 Hrs ( in real case)**
Therefore,
an

**120Ah**battery would take**13 Hrs**for completely charging ( with 13A charging current).**Read full post »**