How to calculate the charging time and current of battery?

By Bharat Ribadiya -

In this article you will learn about how to calculate the charging time and current of battery. So let's get started. Suppose you have a 120Ah  lead acid battery and you want to calculate the charging time, so have required this formula

Charging time of battery = Battery Amp Hour / Charging Current

∴ T = Ah / A

Now, let's find the charging current. The charging current should be 10% of the amp hour rating of battery.

So,
 Charging current of battery = Amp hour of battery * % of losses

∴120 * (10/100) = 12A

This is in ideal case but you have to consider losses also , so considering losses you have to take more amp. It can be 12 to 12 A for charging purpose. Suppose that the charging amp is 13A.

Charging time of battery = Battery Amp Hour / Charging Current
 =120/13            
=9.23 Hour      

 But this result is in ideal case, in real noted that 40% of losses in case of battery charging. By considering 40% of losses


Charging current of battery  = Amp hour of battery * % of losses
             =120 * (40/100)
  = 48        

therefore,  Calculating with losses we get

Amp-hour =  120 Ah + Losses
   = 120+48 
=168Ah 

Now,
 Charging Time of battery = Battery Amp Hour / Charging Current
=168 / 13      
     = 12.92 ≅13 Hrs

Therefore, an 120Ah battery takes 13 hours for charging fully with 13A charging current. If you want to calculate automatically the visit Battery Charge Calculator.

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