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# Current Consumtion by a DC Motor? Answered

I am asking few questions EV related, more current related.
Let a consider a dc motor rated 4hp at 24v and 2hp at 12v.
And if we know the full load current of the dc motor then can we calculate the max load for the dc motor.
Next as the dc motor is 2hp at 12v then will this value be constant or will the motor be able to produce 4hp at 12v even rather than at 24v.
And will a battery eg 50ah be able to supply more then 50amp.

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## Discussions

4 horse power is 2983 Watt (3kW), http://www.wolframalpha.com/input/?i=4+horse+power+to+watt
Power (in Watt) is voltage(volts) times current (ampere), so 4hp at 24v gives 124,3A
http://www.wolframalpha.com/input/?i=4+horse+power+at+24+volt

This is a massive amount of current! Be carefull!

I don't know how the motor works with different loads, but this will be the maximum current draw with load I guess.
Also, I thought blocked DC motors could damage the motor somehow?

DC motors also have a stalled/blocked current rating.

Your calculation makes no allowance for efficiency, but it will be quite high, for a quality motor.

Also, the rated output of the motor occurs at some rated speed, since at zero speed, although its consuming a lot of energy, its not delivering any power.