Amp Hour Help

Greg_Salyer_13
Greg_Salyer_13 Registered Users Posts: 11 ✭✭
in Solar Beginners Corner #1
I have read many posts explaining amp hour as it relates to batteries and I am just getting more confused! My local Sams has 2 different golf cart batteries...

12V....
  • 20 amp hour rate:155
  • Minutes at 25 amps:292
  • Minutes at 56 amps:110
  • Minutes at 75 amps:77
  • Volts:12
6V....
  • 20 amp hour rate:215
  • 5 amp hour rate:157
  • 6 amp hour rate:156
  • Minutes at 25 amps:395
  • Minutes at 75 amps:105
  • Volts:6
What would the resulting amp hour rating be for....
  (4) 6V wired series/parallel 
  (2) 12V parallel
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Comments

  • vtmaps
    vtmaps Solar Expert Posts: 3,741 ✭✭✭✭
    #2
    If you use 4 of the 6-volt batteries at 12 volts, the 20 hr capacity will be 430 ah.

    Two of the 12 volt batteries in parallel will be 310 ah at 12 volts.

    --vtMaps
    4 X 235watt Samsung, Midnite ePanel, Outback VFX3524 FM60 & mate, 4 Interstate L16, trimetric, Honda eu2000i
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  • Greg_Salyer_13
    Greg_Salyer_13 Registered Users Posts: 11 ✭✭
    #3
    What does "20 hr capacity" mean?
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  • vtmaps
    vtmaps Solar Expert Posts: 3,741 ✭✭✭✭
    #4
    It means that you are drawing the amps at a rate that will kill the battery in 20 hours. 

    Thus, if you have a 430 ah battery bank, you can draw 21.5 amps for 20 hours.  Because of Peukert's law, if you draw more amps, the battery has lower capacity. 

    --vtMaps
    4 X 235watt Samsung, Midnite ePanel, Outback VFX3524 FM60 & mate, 4 Interstate L16, trimetric, Honda eu2000i
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