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You can't make a DC voltage multiplier at all. You'd have to use the battery

to power some sort of active power supply which, internally, would either

oscillate or switch to create changing voltage, then step the voltage up

through a transformer, then rectify and filter the higher-voltage AC, and

hand you the higher DC at its output.

You would use a significant and probably unacceptable percentage of the

battery energy just to run the power supply. In other words, the battery

would run the motor for an unreasonably short time before you would need

to replace or recharge the battery.

Look at the power requirement alone! If the 180V motor needs only 1 Amp

to run, then the motor is gorging on 180 watts of power. To deliver only that

much power at 12 volts, you would need to draw 15 Amperes from the battery,

and that doesn't even yet account for power lost in the intermediate power supply.

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11y ago

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