The formula you are looking for is I = W/E. Amps = Watts/Volts. 300/24 = 12.5 amps. A good charger with an output of 15 amps will do the job nicely. The time that it will take to charge the battery will depend on the amp/hrs of the connected battery and the state of discharge that the battery is in when charging starts.
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An aircraft battery is usually 28 volts DC because the need for power is greater in an aircraft than in a diesel truck. Having the 4 extra volts is a type of insurance policy so that the battery does not go dead while the plane is in the air.
The output of a 120 volt dimmer switch will be an AC voltage so should not be used on a DC motor.
Very careful or not at all, because some of the voltages is extremely HIGH it can vary between 300 VDC for a vacuum tube up to a thousands of volt on a CRT and any DC voltage over 24 volt are LETHAL.
The motor would draw about 24 kVA which is 35 amps. For this you would need 10 mm2 cable.
negative - on battaery 1 goes to ground positive + on battery 1 goes to negative - on battery 2 positive + on battery 2 goes to your power requirment can be done in any case senario e.g 2-6volts to get one 12 and 1-12 24 or 4-6volts 12-volts 4 12volts any case senario negative - on battaery 1 goes to ground positive + on battery 1 goes to negative - on battery 2 positive + on battery 2 goes to your power requirment can be done in any case senario e.g 2-6volts to get one 12 and 1-12 24 or 4-6volts 12-volts 4 12volts any case senario