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Re: Minimum battery voltage
I found the attached chart online.
Lead-Acid State of Charge vs Voltage, Richard Perez, Home Power #36, August/September 1993, Page 67
I can't vouch for the chart, but it says that if you let your at-rest battery voltage drop below 12 volts you've already discharged the battery by more than 75% (the State of Charge is less than 25%).
Last I checked, discharges no deeper than 50% (around 12.25 volts at rest) are recommended by FRC battery manufacturers.
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