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Battery charging time

raptor22

Jun 6, 2012
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I have installed a custom made 12 V 750W UPS with 170Ah battery. The charging current is to 14A, so how long will it take to charge the battery.

2. If I use 1 24V 1000W UPS with 2 170Ah battery what will be the charging time.
 

Harald Kapp

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Nov 17, 2011
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In theory 170 Ah/14A = 12h.
In practice some of the charge power is lost due to limited efficiency of the charging process, you will need 110% - 120% of charge, thus the charge time is more like 14h - 17h.
Assuming charge current is stable at 14A, but usually it decreases with rising voltage of the charges battery, so charge time will be even longer.
See also http://www.mpoweruk.com/chargers.htm

Harald
 
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