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12 AWG should be fine since resistance of wire is only about .16 ohms per 100 ft.

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Q: What size of wire is required for 20 amps 220v over 100 ft?

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A #4 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 85 amps. This size wire will also be the same for a load amperage of 68 amps as the next wire size smaller #6 is only rated at 65 amps.

Two conductor and three conductor #12 Teck cables are rated at 20 amps. This size is one over from the 15 amp rated wire. This is because on motor loads the conductor size has to be 125% of the motors full load amps. Since all that was stated is 15 amps it is better to err on the larger size wire.

6 AWG

Wire size depends on amps. Use #10 for 30a. #8 for 40 or 50a. #6 for 60a.

That would be a 40 amp 220v circuit. Circuit breaker is 40 amps and wire is 8 awg. Should use solid copper wire. Follow oven installation instructions.

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45

Number 8. Wire <<>> A #8 copper conductor with an insulation factor of 75 and 90 degrees C are both rated at 45 amps.

At 20 amps the 220V will supply twice (2x) the power that the 110V will supply. The answer depends upon your meaning of the term 'better'. If you have a specific size load that you are supplying such as a motor that will accept either 220V or 110V then by using 220V you will have less of an impact from voltage drop and the conductor size will be smaller due to the current being 1/2 of the 110V. If by better you mean which one will give you the most power then the obvious answer is 220V.

A #4 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 85 amps. This size wire will also be the same for a load amperage of 68 amps as the next wire size smaller #6 is only rated at 65 amps.

6 AWG

Two conductor and three conductor #12 Teck cables are rated at 20 amps. This size is one over from the 15 amp rated wire. This is because on motor loads the conductor size has to be 125% of the motors full load amps. Since all that was stated is 15 amps it is better to err on the larger size wire.

50 amps

Group 34, 600 amps

The battery size depends on the size of the engine. The larger the engine size the more cranking amps are required. A small 12.5 HP will only require around 190 amps while a 22HP will require closer to 360 amps.