AH calculation for battery bank?

bc buck
bc buck Registered Users Posts: 59 ✭✭
Two 12v 100 AH battery's wired parallel. Total of 12v 200AH deep cycled to 50% gives you 100 usable AH.

Two 6v 100AH batterys wired series. Total of 12v 100Ah deep cycled to 50% gives you 50 usable AH.
Just want to make sure im figuring correct.

Comments

  • BB.
    BB. Super Moderators, Administrators Posts: 33,439 admin
    Yes--You are correct.

    However, size wise, a 12 volt ~100 AH battery is about the same size/weight as a 6 volt ~ 200 AH battery (aka "golf cat" battery).

    So--A typical Apple to Apple comparison would be 2x 12 volt @ 100 AH batteries in parallel vs 2x 6 volt @ 200 AH batteries in series... Both give you a 12 volt @ 200 AH battery bank.

    Also, I suggest that a 2x 6 volt @ 200 AH series connected battery bank is "better" than 2x 12 volt batteries in parallel. 1/2 the number of cells to check/water. Also, it is easier to make sure the battery bank is working "right" with a simple volt meter check.

    The series batteries will each have their own operating voltage. When you have 2x 12 volt batteries in parallel--A voltage reading does not really tell you the health of the individual batteries.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • bc buck
    bc buck Registered Users Posts: 59 ✭✭
    Thanks Bill