Batteries discharge diagrams

[liviu2004]

Hy. I am involved in electric design for naval industry. For Lloyd's Register of Shipping I have to show discharge courbes for a specific curent in a determined time. I have searched the net but I cannot find anything.
For example I have I=60A, U=24VDC, t=6h. The voltage must not drop below 88% after discharge time. I have coosed 400Ah battery group.
Anyone have some information?

 

[wbd]

You may have to do a discharge test to determine the performance of the battery bank. Have you consulted the battery manufacturer? They should have information on the battery performance at a constant current for a specific length of time. When the battery bank was specified, any specific discharge requirements should have been given. IEEE 450 has battery capacity test information.

 

[liviu2004]

Making a discharge test is out of discussion. Lloyd's will never accept that kind of test made by me. I will try to contact a battery manufacturer but I thing I will get no aswer due to the fact that the batteries are yard delivery.

 

[Clyde38]

liviu2004,
Search for information on Peukert's Equation (Peukert's Law). Start here:

http://www.smartgauge.co.uk/peukert2.html