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Battery charging time

Discussion in 'Power Electronics' started by raptor22, Jun 6, 2012.

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  1. raptor22

    raptor22

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    Jun 6, 2012
    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.
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    2,138
    Nov 17, 2011
    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
     
    Last edited: Jun 6, 2012
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