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usable ampere hours?

Discussion in 'Photovoltaics' started by Robert Morein, Jun 5, 2004.

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  1. I've read that a typical charge controller does not keep the battery at 100%
    charge, while a typical inverter has a cutoff of around 10.5 volts.

    For a standard golf-cart battery, rated at 220 ah, and a typical charge
    controller, how many usable ampere hours are available in practice?
  2. ptaylor

    ptaylor Guest

    The rule of thumb for lead-acid batteries is to only use %50 of thier
    capacity (run them only half-dead) to increase thier lifespan.
    So about 110AH for one battery.
  3. It really depends on the current drain. Specs for the Trojan T-105
    are approximately:

    75 amps for 115 minutes 140AH
    34 amps for 5 hours 171AH
    25 amps for 7.4 hours 186AH
    11 amps for 20 hours 225AH

    Other vendors batteries will probably give different results, and you
    should chose your depth-of-discharge to suit your religious
  4. A-HA, so that's the secret! :)

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