Battery

What does 100Ah mean on a battery ??

The 100 Ah mentioned on a lead-acid battery is the capacity of the battery in Ah.

Let us take the case of a Normal Discharge Performance 100 Ah stationary battery rated at C10 meant for a 10 hr discharge – in conformance to IS 1651.

This 100 Ah battery when discharged after a full charge is expected to deliver 10 Amps constant current for 10 hrs to an end voltage of 1.85 volts per cell.

The same 100 Ah battery when discharged after a full charge is expected to deliver 16.66 Amps constant current for 5 hrs.

Please note that it shall not deliver and is not expected to deliver 20 Amps for 5 hrs.

The same 100 Ah battery when discharged after a full charge is expected to deliver 23.9 Amps constant current for 3 hrs.

Please note that it shall not deliver and is not expected to deliver 33.3 Amps for 3hrs.

The same 100 Ah battery when discharged after a full charge is expected to deliver 50 Amps constant current for 1 hr.

Please note that it shall not deliver and is not expected to deliver 100 Amps for 1 hr.

The performance of a battery varies depending on discharge. The discharge curve is non-linear.

Thus it is clear that a 100 Ah battery cannot deliver 100 Amps for 1 hour & a 150 Ah battery cannot deliver 150 Amps for 1 hour as is widely believed and misunderstood by a layman.

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For more details on batteries and battery manufacturing machines please visit our websites www.unikbatteries.in & www.unikautomation.com 

Ramesh Natarajan Kailad 

Director

UNIK Techno Systems Pvt Ltd 

Pune India

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