What type of DC motor? Is it permanent magnet, series field, shunt
filed, combination? What. 1 HP, = 746 watts. Assuming 80%, you really
need 932.5. At 12 volts, you need almost 78 amps to drive this thing.
This means you need a 400 amp/hour battery to run this thing for any
length of time. What are you operating with it? You will need a motor
controller designed for the type of motor to vary the speed.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of John Rodgers
Sent: Tuesday, September 28, 2004 12:26 AM
To: vanagon@GERRY.VANAGON.COM
Subject: NVC - how do I control a battery powered DC motor.

I have a 1 HP DC motor that I want to run on a car battery as opposed to
using some sort of converter from AC to DC.

Anyone have any ideas as to how I might do this and control the motor
speed?

Thanks,

John Rodgers
88 GL Driver