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Select Solar Panels Size for Battery Charging 


Suppose for 120 Ah battery,

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

Charging current for 120Ah Battery = 120 Ah x (10/100) = 12 Amperes.

But due to some losses, we may take 12-14 Amperes for batteries charging purposes instead of 12 Amp.

  • Suppose we took 13 Amp for charging purpose, then,
Charging time for 120Ah battery = 120 / 13 = 9.23 Hrs.

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