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Assuming that your headlights are the standard 55 watt variety, at 12 volts the current draw will be just over 10 amps. Current is determined by dividing wattage by voltage. Thus, 110 watts at 12 volts equals 9.17 amps. Lights are resistive devices, so load calculation for motors and other devices must take into consideration starting load and other reactive factors. In old cars, poor connections and undersized conductors can skew the load needs, particularly on 6 volts. Headlights at 6 volts increase the load to just under 20 amps. As Tom suggests, 30 amps should be more than adequate.
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